Prof. Arindam Ghosh

Professor

Department of Physics
Indian Institute of Science
Bangalore – 560012. India.

Tel: +91 (0)80 2293 3288
Fax: +91 (0)80 2360 2602
Email: arindam@iisc.ac.in

Brief CV | Biography

Rajeshwari M.

Secretarial Assistant

Tel: +91 (0)80 2293 2059
Email: rajikiran83@gmail.com

Dr. T. Phanindra Sai

Postdoctoral Research Associate

Ph. D. – Indian Institute of Science

Tel: +91 (0)80 2293 2059
Fax: +91 (0)80 2360 2602
Email: phanindrasai@iisc.ac.in

Research Areas

Graphene due to its two-dimensional nature has many interesting and desirable properties for device applications. My research work involves

• Understanding the origin of electrical noise in a single layer of graphene and contribution of substrate and contacts to the noise.
• Fabrication of ultra sensitive optoelectronic devices of graphene/MoS2 hybrid structure by combining best properties of graphene and MoS2.
• Understanding the plasmonic effects of semiconducting nanoparticles arranged on graphene surface using Langmuir Blodgett technique.
• Sensitive electrical measurements on clean graphene flakes, obtained by in-situ exfoliation to explore graphene edge states.
• Fabrication of complicated structures such as airbridge top metallic top gate, airbridge point contacts using state of the art e-beam lithographic techniques.

Dr. Binita Tongram

Mobile No: +919082759364/+917506112074

Room No:A1-18

Email id: binitatongbram@gmail.com

Website:https://www.researchgate.net/profile/Binita-Tongbram-2

Education Qualification:

M.Tech in Electronics and Communication Engineering, Tezpur University.

M.Tech Project at Institute of Radio Physics and Electronics, Calcutta University.

Ph.D. in Centre for Research in Nano Technology and Science, IIT Bombay.

Award:

Excellence in Ph.D. Research Award, IIT Bombay (2019)

Research Highlight:

Currently, I am working on the synthesis of CdSe Nanoplatelets and will be studying the electrical, structural, and optical properties of CdSe-Nanoplatelets with single-layer graphene hybrid devices. Hybrid devices consisting of high-confined quantum structures and 2D materials like graphene and MoS₂ have been extensively studied for photodetectors, photovoltaic, and single-photon emitters.

My doctoral research was on the “A Detailed Investigation of Single-, Bi- and Multi-layer Quantum Dot Heterostructures Grown by Molecular Beam Epitaxy for Enhancing Performance Characteristics of Future InAs/GaAs Quantum Dot Infrared Photodetectors (QDIPs)”, which involved detailed structural characterization of InAs QDs through HRTEM and HRXRD, optical characterization of InAs QDs through room temperature PL and PLE, and electrical characterization of QDIP.

My Ph.D. thesis objective was to achieve high homogeneity in QD size and shape with equal lateral QD spacing in Single layer, Bilayer, and vertically coupled multilayer QDs in order to achieve state-of-the-art QDIP performance by solving the aforementioned problems, namely interdiffusion, segregation, QD dissolubility, strain, defects, and dislocations, misalignment. We achieved the highest peak detectivity of 10 × 10¹⁰ cm Hz^1/2/W for single-pixel devices quaternary-capped 30-layer QD heterostructures.

During my Ph.D. program, I was serving as a teaching assistantship in Field emission Transmission Electron Microscopy, System Model TECNAI TEM F30, and Rigaku SmartLab High-Resolution X-ray Diffractometer for 2 and a half yrs.

Dr. Gayathri H.N.

Ph.D. from Centre for Nano and Soft Matter Sciences

Tel.: +91 (0)80 2293 2059

Email: gayathri@iisc.ac.in

Research Areas

Two dimensional (2D) materials in general have unique properties when compared to their bulk counterparts, whether the material is a molecular monolayer or a single layer of graphene. My research interest lies in understanding these 2D materials at various interfaces.

I am a trained experimental physicist in the field of soft matter physics that deals with formation and characterisation of monolayers and multilayers of organic thin films at interfaces. Liquid crystals (LCs) have made enormous contributions to the field of display technology as well as micro-electronics. Our interest was to explore some of the well known LCs in the form of monolayer and multilayers to find suitable applications in micro-electronics. In particular, studying rod like n-alkyl cyanobiphenyls and polymers of disc shaped LCs for their phase transition in monolayers at air-water interface and the charge transport studies across the monolayers at air-solid interface. We have also explored the dynamics of wetting and dewetting in nematic micro domains, which can help in understanding emulsions, recovery in oil spillage and so on.

My other area of research interest is in the field of inorganic two-dimensional materials. We are carrying out liquid exfoliation of two-dimensional materials like BN and study their effects in polymer composites.

Dr. Neha Chauhan

Email: nehachauhan@iisc.ac.in
Phone: +91 (0)80 2293 2059
Web: https://www.linkedin.com/in/neha-chauhan-4b11a940/

Education:
Ph.D.:  Bio-Nano Science Fusion (Oct 2011 – Sep 2014), Graduate School of
Interdisciplinary New Science, Toyo University, Japan.

Experience:
 Post-Doctoral Fellow, (Oct 2014 – Jul 2018), Bio-Nano Electronics Research Centre,
Toyo University, Japan.
 Research Assistant (2011 – 2014), Bio-Nano Electronics Research Centre, Toyo
University, Japan.
 Project Assistant (2009 – 2011), National Physical Laboratory-CSIR, Delhi, India.

Research Area:
For pushing miniaturization limits of optical and electronic devices, it is extremely important
to achieve nanometric precision control over placement of single and multiple nanoparticles
at selective areas on a given substrate. My current research is focused on developing a novel
way for building single and multi-component devices that may have interesting emergent
optical and electronic properties.
My core research interests involve large-scale synthesis, directed assembly and advanced
characterization of 2D nanomaterials with specific application areas in multifunctional
nanocomposites, flexible-electronics, optoelectronics and sensor technologies.

Dr. Shaili Sett

Email: shailisett@iisc.ac.in
Phone: +91 (0)80 2293 2059
Web: ResearchGate Profile

Education

M.Sc: Dept. of Physics, Indian Institute of Technology, Madras.

Ph.D: Dept. of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata.

Research Area

Currently, my research focuses on probing opto-electronic properties of twisted bilayer van der Waals heterostructures. Recent theoretical studies have predicted that the electronic band structure of two-dimensional materials modify with twist angle between the layers leading to emergent phenomenon such as superconductivity, Mott insulating states etc. The Moire pattern formed between the monolayers leads to a periodically modulated Moire potential, that can strongly modify optical properties. It will be exciting to probe and understand the inter-layer excitonic properties in a Moire superlattice through opto-electronic and transport studies.

During my doctoral thesis, I worked on transport properties of single semiconductor nanowires, particularly Germanium. My work involved growth, characterization and fabrication of single nanowire devices for low temperature electrical and opto-electronic studies.

Dr. Tuhin Kumar Maji

Email: tuhinmaji@iisc.ac.in

Website: https://sites.google.com/view/tuhinmaji

Education:

Ph.D. (Nanoscience and Nanotechnology):  S. N. Bose National Centre for Basic Sciences

M.Sc. (Physics): Indian Institute of Technology Madras

B.Sc. (Physics): Ramakrishna Mission Vidyamandira (University of Calcutta)

Research Interest:

Currently, my research focuses on the synthesis and structural analysis of the bimetallic gold-silver hybrid system. Recent studies have indicated that there is a possibility of resistance drop in the hybrid Au/Ag system. However, the exact structural identification is still not clear. My present research will be to probe the structural analysis of the bimetallic Au/Ag structure and investigate its electrical properties.

During my doctoral training, I worked on the synthesis, application, and computational investigation of various oxide-based nanohybrid. My work involved the development of hybrid nanomaterials for manifold applications. Besides I have done DFT-based computational analysis of the hybrid systems and topological systems to investigate their electronic properties.

Dr. Mahendra Pawar

Email: mahendrap@iisc.ac.in
Education:
Ph.D. (Physics): CSIR-National Chemical Laboratory, Pune, India
M.Sc. (Physics): Department of Physics, University of Pune, Pune, India
Research Interest:
My current research is focused on large-scale production of two dimensional (2D) nanosheets
and investigate their thermal properties. To study or utilize these 2D materials, control of their
production is critically important. In this context, I will be looking at the several aspects of
exfoliation in order to obtain 2D nanosheets in large quantities with high quality.
During my doctoral studies, I worked on few 2D materials such as MoS 2 , SnSe 2 , PtSe 2 , and Black
Phosphorus for humidity/gas sensor and photodetector device applications.

Dr. Md Arif Ali

Interests: Apart from scientific research, I am interested in literature, traveling, politics, economics, art, and culture

Dr. Priyanka Yadav

During my Ph.D., I focused on the synthesis, characterization, and device fabrication of 2D materials for optoelectronic applications. I have specifically worked with TMDs materials such as MoSe2, MoS2, TiS2, TaS2, and Graphene, aiming to produce high-quality materials with controlled thickness and harness their potential in optoelectronic devices.

Dr. Richa Pokharel Madhogaria

Education

PhD: Department of Physics (2017- 2021), University of South Florida, Tampa, Florida, USA

Experience

Post-doc: Department of Materials Science and Engineering (2021-2023), University of Tennessee, Knoxville, USA

Research Area

My current research focusses on implementing noise measurements for understanding the fundamental physics of 2D systems. Shot noise spectroscopy can give insights about the statistics of the quasi-particles, hence making it a unique tool to reveal the information about the edge modes present in topological quantum materials.

My previous experience includes growth and characterization of complex magnetic systems (PhD) to Kagome single crystals (Post-Doc). I have utilized multiple techniques such as electrical, thermal and thermoelectric transports; magnetometry (ac and dc), neutron and X-ray diffractions to explore the exotic physics of various quantum materials.

Shreya Kumbhakar

Research Student 

Prime Minister’s Research Fellow

Tel: +91 (0)80 2293 2059                                                                                                                                          Email: shreyak@iisc.ac.in

Education

B. Sc: Presidency University, Kolkata

Saisab Bhowmik

Research Student

Tel: +91 (0)80 2293 2059
Email: saisabb@iisc.ac.in

Education:

B.Sc. (Physics) Hons. from Jadavpur University

Research Area

Electrical and thermal properties of two-dimensional materials.

Navkiranjot Kaur Gill

Aniket Majumdar

Research Student

Tel: +91 (0)80 2293 2059
Email: aniketm@iisc.ac.in

Education:

B.Sc.: Jadavpur University

Research Area

Electrical properties of two-dimensional materials

Arup Singha

Research Student

Tel: +91 (0)80 2293 2059

Email: arupsingha@iisc.ac.in

Research Area

Electrical properties of two-dimensional materials

Pritam Pal

Prime Minister’s Research Fellow

Tel: +91 (0)80 2293 2059

Email: pritampal@iisc.ac.in

Education:

B.Sc. : Presidency University, Kolkata

Research Area

Electrical properties of two-dimensional materials

Akash Gugnani

Aditi Choudhary

Research Student

Banashree Debnath

Subhabhan Roy

Somaditya Santra

Mohammed Shafeeullah

Dr. Aparna P

Research Student

Prime Minister’s Research Fellow

Tel: +91 (0)80 2293 2059                                                                                                                                          Email: aparnap@iisc.ac.in

Education

Integrated BS-MS: Indian Institute of Science Education and Research (IISER), Bhopal

Bireshwar Roy

Dr. Rahul Debnath

Research Student

Tel: +91 (0)80 2293 2059
Email: rahuldebnath@iisc.ac.in

Research Area

Electrical and optical properties of twisted bilayer-TMDC Moire superlattice.

Dr. Bhaskar Ghawri

Research Student

Tel: +91 (0)80 2293 2059
Email: b.ghawri@gmail.com

Research Area

Electrical and thermal properties of 2D materials.

Dr. Subir Kumar Ray

Email: subirray@iisc.ac.in

Phone: +918436672524

Education:

Ph.D. (Optics and Nano-photonics): Indian Institute of Science Education and Research Kolkata, Mohanpur, India.

M.Sc. (Physics): Banaras Hindu University, Varanasi, India.

Experience:

Post-Doctoral Research Associate: Elmore Family School of Electrical and Computer Science Engineering, Purdue University, West Lafayette, USA.

Post-Doctoral Research Fellow: Joint appointment at the Department of Medical Biophysics, University of Toronto & University Health Network (Princess Margaret Cancer Research Centre), Toronto. 

Research:

I am an experimental physicist interested in understanding the physics of light-matter interactions and their polarization control manipulation for device applications. In my doctoral research, I have experimentally demonstrated the spectral tuning and conversion of coherent perfect scattering to coherent perfect absorption within a precisely engineered anisotropic plasmonic metamaterial using polarization of light as an external degree of freedom to the system. My postdoctoral research at Purdue University includes the experimental characterization of heat polarization and probing violations of Kirchhoff’s law of thermal radiations. My work at the University of Toronto aimed to solve a clinical problem of a real-time intra-operative medical imaging system for determining Brest cancer tumor margin based on nanoparticle-assisted polarization parametric imaging.   

My current research interest focuses on understanding quantum materials’ electronic and photonic properties and enables the development of novel nanodevices for quantum technologies. 

:: Activity::

Apart from scientific research, I have diverse interests, including sports, traveling, music, poetry, art, and culture

Dr. Saloni Kakkar

Research Student

Tel: +91 (0)80 2293 2059
Email: salonikakkar@iisc.ac.in

Research Area

Electrical and thermal properties of 2D materials.

Nivedith K A

Undergraduate Student

Tel: +91 (0)80 2293 2059

Email: nivedithk@iisc.ac.in

Research Area

Electrical properties of two-dimensional materials

Sai Prasad

Email id : saiprasadgochhayat1999@gmail.com

Hruthik Patil

Undergraduate Student

Tel: +91 (0)80 2293 2059

Email: hruthikpatil@iisc.ac.in

Research Area

Electrical properties of two-dimensional materials

Muskan Saha

Project Student

Email: muskan17@iiserb.ac.in

Kumidini Pulaparthi

Dr. Sreemanta Mitra

Ph.D.: Indian Association for the Cultivation of Sciences

Tel.: +91 (0)80 2293 2059

Email: sreemanta85@gmail.com

Personal Webpage: https://sreemanta85.wixsite.com/mitraonweb

Bio:

Born and raised in Kolkata, India, I did my Bachelors & Masters in Physics from BidhanNagar Govt. College & Razabazar Science College, University of Calcutta, in 2006 and 2008 respectively. I then joined Prof. Dipankar Chakravorty and Dr. Sourish Banerjee for my Ph.D. in experimental Condensed Matter Physics in Indian Association for the Cultivation of Science, India. During PhD, I worked on the transport and magnetic properties of low dimensional systems, graphene and nanocomposites prepared thereof. After completion of my Ph.D. in 2013, I joined Prof. Dan Shahar in the Condensed Matter Physics department of The Weizmann Institute of Science, Israel, to work on the superconductor to insulator transition in nanowire devices made up of amorphous indium oxide. Post that, I joined Nanyang Technological University, Singapore for my second post-doctoral study in 2015, with Prof. Christos Panagopoulos and Prof. Pinaki Sengupta where my research interest was in the low-temperature magnetotransport properties in Archemidean quantum magnets. Recently, I joined this group, where my current research interest is the electrical transport and optoelectronic properties in Van der Waals heterostructure devices.

Dr. Manjari Garg

Tel.: +91 (0)80 2293 2059

Email: manjarigarg@iisc.ac.in

Education:

• Ph.D.: Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
• M.Sc.: Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
• B.Sc. (Hons.) Physics: University of Delhi, New Delhi, India

Research Interests:

Electrical transport across rectifying metal-semiconductor interface, Noise and fluctuations in electrical characteristics of Schottky diodes, Surface modification of semiconductors for resolving issues due to defect-related surface states and charged surface states, Optoelectronics of wide bandgap semiconductor material, Straintronics in two-dimensional layered materials, Thermal transport in twisted two-dimensional materials

Current Research Area:

The discovery of the unusually high thermal conductivity, , of graphene and the unique nature of its  value scaling with the thickness in suspended few-layer graphene have encouraged different experimental and theoretical investigations. The developing thermal field of graphene makes it a potential candidate for being used as thermal interface material, thermal phase change material and heat spreader. However, it is interesting to understand how the thermal conductivity will be effected by rotating the atomic planes in twisted bilayer graphene structures (t-BLG). Will the main heat carriers in t-BLG behave in the same way as in single layer graphene? Will extraordinary heat flux be observed via stacks of t-BLG structures or heat conduction will be suppressed in the weakly bound twisted atomic planes? What mechanisms would be responsible for the either case! In order to answer these questions, my current research work is focused on analysing the thermal transport in low-angle twisted bilayer graphene structures, both fundamentally and practically.

RAMACHANDRA S BANGARI

Dr. Aditya Jayaraman

Research Student

Tel: +91 (0)80 2293 2059
Email: jaditya@iisc.ac.in

Research Area

Electrical and thermal properties of 2D materials.

Dr. Phanibhusan Singha Mahapatra

Research Student

Tel: +91 (0)80 2293 2059
Email: phanis@iisc.ac.in

Research Area: 

Thermo-electric transport in Van der Waal junctions.

When two planar atomic membranes are placed within the van der Waals distance, the charge and heat transport across the interface are coupled by the rules of momentum conservation and structural commensurability, lead to outstanding thermoelectric properties. My research focuses on exploring the electric and thermoelectric transport across the van der Waals gap formed in twisted bilayer graphene (tBLG). The Tunability of cross-plane Seebeck effect in van der Waals junctions may be valuable in creating a new genre of versatile thermoelectric systems with layered solids.

Publications: “Seebeck coefficient of a single van der Waals junction in twisted bilayer graphene”, P. S. Mahapatra, K. Sarkar, H. R. Krishnamurthy, S. Mukerjee and A. Ghosh(accepted Nano Letters DOI:10.1021/acs.nanolett.7b03097)

Shreya Singh

Dr. Jyoti Shakya

Email: jyiitd@gmail.com
M.Sc. Indian Institute of Technology, Delhi (2012)
PhD Jawaharlal Nehru University, New Delhi (2018)

Research Areas
Two-dimensional materials have attracted a great deal of attention within the scientific
community over the past decade owing to the unique new physics that emerges as we
transition from bulk to monolayer materials. My research interest involves the development
and study of two-dimensional materials aimed at optoelectronic devices. Also, I am interested
in metal based nanocomposites (M-TiO 2 , M-Graphene oxide (M: Ag, Au)) for photocatalytic
application and energy transfer mechanism.

Dr. Saurav Islam

Research Student

Tel: +91 (0)80 2293 2059
Email: isaurav@iisc.ac.in

PERSONAL WEBPAGE

Dr. Tathagata Paul

Research Student

Tel: +91 (0)80 2293 2059
Email: paultathagata@gmail.com

Research Area

Electronic, optoelectronic and low frequency noise measurements in transition metal dichalcogenide (TMDC) field effect transistors. Fabrication and characterization of TMDC based heterostructures aimed at optical and ferroelectric applications.

Dr. Tanweer Ahmed

Research Student (Integrated PhD batch 2011)

Tel: +91 (0)80 2293 2059
Email: tanweer@iisc.ac.in

Research Area

Electronic and Structural properties of Interface engineered atomically thin 2-D crystals:

Transition Metal Di-Chalcogenides (TMDCs) have gained enormous attention due to their rich electronic and structural properties i.e. direct E_g in 1L, thickness dependent E_g, spin valley coupling etc. Although TMDCs are normally semiconductors, It has been theoretically predicted that they can have a variety of crystalline phases which are normally unstable. A novel technique to stabilize one such ferroelectric phase in MoS₂ has been discovered. Our spectroscopic and electronic evidences confirm that 1L MoS2 can be converted into a ferroelectric. The ferroelectric negative capacitance is being subsequently used to break the theoretical lower limit of subthreshold slope in FET.

Paramjeet Kaur

Email: paramjeetk@iisc.ac.in

Tel: +91 (0)80 2293 2059
Fax: +91 (0)80 2360 2602

M.Tech in Laser and Electro-optics, Department of Applied Physics, Defence Institute of advanced technology, Pune

Research Area

Synthesis of nanosheets of graphene and it’s analogues

Krishna Kanhaiya Tiwari

Project Assistant

Tel: +91 (0)80 2293 2059
Email: kktiserc@gmail.com

Education:

Integrated M.Sc, Department of ISERC, Visva Bharati University.

Research Area

Electrical properties of transition metal dichalcogenide (TMDC) field effect transistors.

Dr. Kimberly Hsieh Sui Mee

Former Research Student

Presently at Aarhus, Switzerland.

Smriti Prakash Suman

Strain engineering in TMDCs (WSe2) through Van der Waals epitaxy: Relative stabilization of the 1T’ phase (which has a higher electrical conductivity) against the 1H phase has been observed in MoS2 via VdW epitaxy.  We try investigating a similar phenomenon in WSe2 by investigating the optical and electronic properties of the heterostructure and relating the signatures to the strain developed in the system.

Ankit Kumar

Bunmi Jacob Akeredolu

Research Student

Tel: +91 (0)80 2293 2059

Email: bunmi_dolu2002@yahoo.co.uk

Education

University: Federal University of Agriculture Makurdi, Benue State. Nigeria.

PhD Research Fellow

Research Area

Synthesis of nanosheets of two-dimensional materials

Dr. Subhrangsu Sarkar

Dr. Anindita Sahoo

Integrated M.S-PhD from Indian Institute of Science, Bangalore.

Presently at CEA-Leti, Grenoble, France.

Dr. Avradip Pradhan

Research Student

Tel: +91 (0)80 2293 2059
Email: avradip@iisc.ac.in

Research Areas

I am currently looking into the electrical transport properties as well as the optical response of ultra-thin semiconducting Tellurium (Te) nanowires (NWs). The preliminary transport results show that the transport in Te NWs is thermally activated in high temperature (>170K) and in the low temperature (<170K), Mott Variable Range Hopping (VRH) takes place. On the other hand, Te NW serves as an excellent candidate for near-infra red detector, as it is a narrow band-gap semiconductor (~0.6 eV). This allows us to investigate this interesting and highly popular field full of new novel physics of light-matter interaction as well as basic applications.

Gagandeep Singh

Tel: +91 (0)80 2293 2059
Fax: +91 (0)80 2360 2602
Email: gagan8619@gmail.com

Research Area:

My research work focuses on optoelectronic properties associated to defects in two-dimensional materials. Defects have been known to influence the mechanical and electronic properties in two-dimensional materials and are considered to be undesirable. However, recent studies have exploited in-gap defect states for emission of single photons. Employing techniques such as high resolution confocal microscopy and resonant excitation it will be interesting to reveal the morphological and electronic properties of these emitters.

Dr. Kallol Roy

Research Student

Tel: +91 (0)80 2293 2059
Email: kallol@iisc.ac.in

Research Areas

My research interests have been the development and study of novel low dimensional materials (2D van der Waal heterostructures) through building atomically-thin-Lego from graphene, molybdenum disulfide (MoS₂) and other similar van der Waals materials for highly sensitive photodetection and quantum sensing applications e.g. number resolved single photon detection etc.

Our experimental investigations have confirmed that the electrical property of one van der Waals material (graphene, bilayer-graphene) can be combined with the optical property of the other van der Waals material (molybdenum disulphide (MoS₂)) by physically stacking these together and forming heterostructures (Nature Nanotechnology 8, 826-830 (2013)). Irrespective of the nanoscale thickness (< 10 nm), such combination allows achieving extremely large photoresponsivity which is not observed in conventional photo-sensitive materials/devices. Our recent results with bilayer-graphene-MoS₂ heterostructures show that such devices can be operated as number-resolved single photon detectors (Advanced Materials, In press (October-2017)).

In collaboration with Paria et al., we have also demonstrated that nanostructure of dimers can be used to enhance light matter interaction in a monolayer graphene leading high photoresponsivity (Advanced Materials 27, 1751-1758 (2015)).

Ashok Suresh Das

Paritosh Karnatak

Former Research Student

Presently at University of Basel, Switzerland.

Personal Webpage

Amogh Kinikar

Undergraduate Student

Tel: +91 (0)80 2293 2726
Email: amogh@ug.iisc.in

Research Area

I study conductance properties of pristine graphenenano-ribbons, which are created by a novel mechanical nano-exfoliation technique using an STM tip. Graphene created this way, has pristine edges as it has not been exposed to any chemicals or the atmosphere. It has been possible to study the change in the conductance of a graphene nano-ribbon caused by atomic level structuralchanges.

Dr. Mohammed Ali Aamir

Research student

Personal webpage

Tel: +91 (0)80 2293 2726
Email: mdaliaamir@gmail.com

My device gallery

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My research gallery

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My research

GaAs/AlGaAs heterostructures

A two-dimensional electron system (2DES) formed in a GaAs/AlGaAs heterostructure offers an avenue to build a variety of mesoscopic devices, much of which is achieved by the capability to construct complex potential landscapes using surface gates. Trapping charge carriers in low densities on them gives the prospects for a broad range of phenomena to emerge. This was the central idea behind my studies in these systems.

Linear magnetoresistance in two-dimensional electron systems

• Linear magnetoresistance in strongly inhmogeneous regime
• Colossal magnitude of about 10,000% by 8 T
• Mobility dependent but temperature independent
• Classical phenomenon

Quantum dot lattice in two-dimensional electron systems

• Periodic potential form both antidot lattice and quantum dot lattice
• Quantum dot lattice with electrostatically tunable energy scales
• Non-equilibrium transport reveals its formation
• Can be used to simulate solid-state systems artificially

Bilayer graphene

Bilayer graphene (BLG), made of two layers of graphene sheets in Bernal stacking, is fundamentally different from an individual graphene layer. The most striking property is that a tunable band gap can be induced in BLG by applying an electric field perpendicular to its plane. As a result, BLG can be electrically driven from a metallic state, with high carrier mobility, to a strongly insulating state, thus being suitable for a diverse range of novel device applications. However, experiments revealed that a significant density of states exist inside the band gap, which leads to new transport mechanisms. My goal has been to understand its true nature by examining noise in the form of flicker noise and mesoscopic conductance fluctuations when it is strongly gapped.

Percolative and edge transport in gapped bilayer graphene

• Random potential fluctuations enable percolative paths in gapped bilayer graphene
• Observable by both standard electrical and flicker noise measurements
• Possible evidence for edge transport

Mesoscopic conductance statistics in gapped bilayer graphene

• Mesoscopic conductance fluctuations in gapped bilayer graphene
• Anomalous increase in conductance variance near metal-insulator transition
• Exploration of the scaling theory of localization in strongly gapped regime
• Observation of log-normal spectrum of conductance in strong disorder

Dr. Jayanta Kumar Mishra

Postdoctoral Research Associate

Ph. D. – Institute of Applied Physics, Technische Universität Braunschweig

Tel:  +91 80 22932726

Email: jkmishra@physics.iisc.ernet.in

Research

 I am working on field effect devices based on 2D materials such as BN, MoS2, WSe2 and Graphene, specifically on their optoelectronics properties.

Dr. Ranjit V. Kashid

Ph. D. – University of Pune

Dr. D S Kothari Post-Doctoral Fellow

Email: ranjitkash@gmail.com

Research

• Plasmonic coupling for optoelectronics of 2D hetrostructures:

Recent advances in growth and synthesis 2D transition metal dichacogindes (TMDCs) have opened new    avenues for their implementation into electronic as well as optoelectronic devices. However, weak absorption in ultrathin semiconducting 2D TMDCs is a critical issue for photovoltaic application. For enhancing light matter interaction we are coupling 2D hetrostructures with plasmonic nanostructures.

Past

Ph. D Physics (2008-2014)
University of Pune, India

 Publications

• https://scholar.google.co.in/citations?user=PQne9MoAAAAJ&hl=en
• https://www.linkedin.com/pub/ranjit-kashid/5a/a58/740

Anuva Aishwarya

Undergraduate Student

Tel: +91 (0)80 2293 2726
Email: anuva@ug.iisc.in

Research Area

Studying conductivity fluctuations in the metal-insulator transition region of Samarium Nickelate.

Dr. Semonti Bhattacharyya

Former Research Student

Presently at Monash University, Australia.

Research Areas

• Topological Insulators :The in-built topological protection against direct backscattering and absence of localization makes two-dimensional (2D) surface states of bismuth chalcogenide-based strong topological insulators (TIs) a promising platform for electronic and spintronic applications. Our study of noise in these samples not only allow us to evaluate the quality of signal but also find out the mechanisms responsible for dynamic scattering for the surface states. Our experiments reveal that the noise induced in these surface states does not stem from any external factors like substrate-sample interface or sample adsorbates, rather it involves the generation-recombination processes involving different impurity bands in the bulk of the TI .
• Magnetically Doped TI : Interplay of topologically protected states and broken time-reversal symmetry makes Ferro-magnetically doped topological insulators (FMTI) interesting systems for both fundamental science and technological applications. The interplay of ferromagnetic defects and magnetism makes FMTI a very interesting field of study but although average transport measurements and spectroscopic studies very efficiently captures the average characteristics, microscopically intuitive study of defect dynamics (1/f noise) has been lacking. Our experiments in magnetically doped TI films has shown that localized states induced by magnetic (Cr) impurities gives rise to exponentially enhanced resistance fluctuations at both low temperature and density.

Dr. Saquib Shamim

Former Research Student

Presently at Universität Würzburg, Germany.

Ojasvi Khare

Research Student (Integrated PhD – 2nd Year)

Tel: +91 (0)80 2293 2726
Email: ojasvikhare@physics.iisc.ernet.in

MS Thesis Abstract:

Dr. Bhupendra Kumar Sharma

DST-INSPIRE Faculty

Email: bksharma@cense.iisc.ernet.in
Phone: +91-80-2293-2726

Research:

Bhupendra Kumar Sharma, currently engaged in various research activities such as low temperature solution process synthesis of semiconductor and dielectric metal oxides, 2D materials (Graphene and MOS₂) and its hybrid with inorganic materials for electronic applications. He consider to develop the materials engineering, its compatibility, and new architecture for flexible, printable and various electronic applications.

Research ID:http://www.researcherid.com/rid/K-5038-2012

Harshit Dubey

Undergraduate Student

Tel: +91 (0)80 2293 2726
Email: ugharshitdubey@ug.iisc.in

Research Area

I mainly work on opto-electronics of 2 dimensional materials; Graphene, MoS2 and their hetro-structures. I am also interested in automation of techniques for low temperature nano scale measurements. I am currently working in single photon detection on Gr/MoS2 hetro-structure.

Irfan Ansari

Undergraduate Student

Tel: +91 (0)80 2293 2726
Email: irfan@ug.iisc.in

Research Area

Graphene and other 2D materials like transition metal dichalcogenides (TMDCs) have attracted a lot of attention in optoelectronics and sensing technology due to their extraordinary electronic and optical properties. The optoelectronic devices can be integrated with the plasmonic nanostructures to tailor the bandwidth and photoresponse. Our aim is to understand how the localization of electric field due to the plasmonic nanostructures affects the photoresponse of graphene heterostructures. I use computational electromagnetic techniques like BEM and FEM to simulate the localized surface plasmon resonance (LSPR) for a structure of random shape and size.

Pranav Mundada

Undergraduate Student

Tel: +91 (0)80 2293 2726
Email: pranavm@ug.iisc.in

Research Area

Low temperature measurements in photodetectors composed of transition metal diChalcogenide and graphene heterostructures.

Dr. Vidya Kochat

Former Research Student

Dr. Koushik R

Former Research Student

Dr. Subhamoy Ghatak

Former Research Student

Dr. Mitali Banerjee

Postdoctoral Research Associate
Presently at Weizzman Institute

Ashwani Kumar

Former Project Assistant

Tel: +91 (0)80 2293 2726
Fax: +91 (0)80 2360 2602
Email: ashwanik8080@gmail.com

Bhargava Thyagarajan

Former Project Assistant

Tel: +91 (0)80 2293 2726
Fax: +91 (0)80 2360 2602
Email: brokaboks@gmail.com

Dr. Mohana Sundaram

Former Research Student

Dr. Medini Padmanabhan

Former IISc Centenary Postdoctoral Fellow

Reema Natu

Former Project Assistant

Tel: +91 (0)80 2293 2726
Fax: +91 (0)80 2360 2602
Email:

Uma Maheswari

Former Project Assistant

Dr. Atindra Nath Pal

Assistant Professor, Department of Physics, Indian Institute of Technology Kharagpur

Priyamvada Bhaskar

Former project Assistant

Dr. Chandni U.

Dr. Srijit Goswami

Postdoctoral Research Associate
Kavli Institute of Nanoscience
Delft, The Netherlands

Dr. Amrita Singh

(DST-Nanomission Postdoctoral Fellow)

Currently at Leiden Institute of Physics
Leiden University

Dr. Vijay Narayan

Postdoctoral Research Associate
University of Cambridge
UK

Dr. Matthias Baenninger

Postdoctoral Research Associate

Currently at Stanford University
Palo Alto, USA

Dr. Soumik Mukhopadhyay

Assistant Professor

Indian Institute of Technology
Kanpur

Christoph Siegert

Visiting Research Scholar
University of Cambridge

Komal Bagga

Currently at University of Genoa, Italy

Sneha Eashwer

Currently at Exeter University
UK

Anupam Ghosh

Project Assistant

Currently at Center for NanoScience and Engineering
IISc