Research

PhD research

Near-field control of 2D materials with nano-plasmonics

Supervisor: Prof. Mohammad Hafezi, JQI, University of Maryland, USA

Publication: Supratik Sarkar*, Mahmoud Jalali Mehrabad*, Daniel G. Suárez-Forero*, Liuxin Gu*, Christopher J. Flower, Lida Xu, Kenji Watanabe, Takashi Taniguchi, Suji Park, Houk Jang, You Zhou, Mohammad Hafezi. Sub-wavelength optical lattice in 2D materials. arXiv:2406.00464 (2024).  (*authors contributed equally)

Studying a hybrid Bose-Fermi Mott insulating state in moiré heterostructures

Supervisor: Prof. Mohammad Hafezi, JQI, University of Maryland, USA

Publication: Beini Gao*, Daniel G. Suárez-Forero*, Supratik Sarkar*, Tsung-Sheng Huang, Deric Session, Mahmoud Jalali Mehrabad, Ruihao Ni, Ming Xie, Pranshoo Upadhyay, Jonathan Vannucci, Sunil Mittal, Kenji Watanabe, Takashi Taniguchi, Atac Imamoglu, You Zhou, Mohammad Hafezi. Excitonic Mott insulator in a Bose-Fermi-Hubbard system of moiré WS2/WSe2 heterobilayer. Nat Commun 15, 2305 (2024).  (*authors contributed equally)

Chiral Optical Nano-Cavity with Atomically Thin Mirrors

Supervisor: Prof. Mohammad Hafezi, JQI, University of Maryland, USA

Publication: Daniel G. Suárez-Forero*, Ruihao Ni*, Supratik Sarkar*, Mahmoud Jalali Mehrabad*, Erik Mechtel, Valery Simonyan, Andrey Grankin, Kenji Watanabe, Takashi Taniguchi, Suji Park, Houk Jang, Mohammad Hafezi, You Zhou. Chiral Optical Nano-Cavity with Atomically Thin Mirrors. arXiv: 2308.04574 (2023). (*authors contributed equally)

Optically probing strongly correlated electronic states

Supervisor: Prof. Mohammad Hafezi, JQI, University of Maryland, USA

Brief description: We aim to optically study exotic excitonic and correlated electronic states in systems with significant on-site Hubbard interactions, like twisted bilayer Transition Metal Dichalcogenides (TMDs), high Tc superconductors, etc. We are interested in exploring quantum Hall physics, and many-body physics in these materials.

Masters research

Deterministic single photon subtraction using SPRINT in a three-level emitter for engineering exotic non-classical states of light

Supervisor: Prof. Michal Bajcsy, IQC, University of Waterloo, Canada

Brief description: We perform analytical and numerical analysis of deterministic single photon subtraction from any arbitrary state of light using single photon Raman interaction (SPRINT) in a single quantum emitter coupled with a chiral waveguide or a bi-modal cavity. We also investigate the performance of recently reported emitter-waveguide systems as a photon subtractor for different types of input light. Furthermore, we studied how this mechanism can be used to engineer non-classical exotic quantum states that have applications in quantum information theory.

Designing optical antennas with Inverse Design for enhanced directional emission of radiation from NV centers

Supervisor: Prof. Michal Bajcsy, IQC, University of Waterloo, Canada

Brief description: We employed adjoint optimization and inverse design techniques to design diamond nanophotonic devices that help in directional emission of radiation from nitrogen vacancy centers in diamonds. Our design gives us a higher collection efficiency compared to existing techniques.

Designing and fabricating photonic crystal mirrors for making cavities inside hollow-core fibers

Supervisor: Prof. Michal Bajcsy, IQC, University of Waterloo, Canada

Brief description: We designed and fabricated photonic crystal mirrors for making fiber-integrated Xe laser operating in the ultraviolet (UV) region when exposed to RF discharge. I have been associated with fabricating the photonic crystal membranes.

Undergraduate research

Undergraduate Final Year Project: Tunneling in Graphene SymFETs

Supervisor: Prof. Chayanika Bose, Jadavpur University, India

Report: Supratik Sarkar, and Samrat Sarkar, Tunneling in Graphene SymFETs, arXiv: 1805.09659 (2018).

Single Photon Subtraction from Continuous Variable Cluster States

Supervisor: Prof. Nicolas Treps, LKB (CNRS, ENS, UPMC-Sorbonne), France 

Publication: Mattia Walschaers, Supratik Sarkar, Valentina Parigi, and Nicolas Treps. Tailoring Non-Gaussian Continuous-Variable Graph States. Physical Review Letters 121, 220501, doi: 10.1103/physrevlett.121.220501 (2018).

Influence of Polarization and Self-polarization Charges on Impurity Binding Energy in Spherical Quantum Dot with Parabolic Confinement

Supervisor: Prof. Chayanika Bose, Jadavpur University, India

Publication: Supratik Sarkar, Samrat Sarkar, and Chayanika Bose. Influence of polarization and self-polarization charges on impurity binding energy in spherical quantum dot with parabolic confinement. Physica B: Condensed Matter, 541, 75-78, doi: 10.1016/j.physb.2018.04.035 (2018).

Detection of Celiac Disease from Endoscopy Images Using Convolutional Neural Networks

Supervisor: Prof. Debdoot Sheet, Indian Institute of Technology (IIT) Kharagpur, India

True Random Number Generators

Supervisor: Prof. Subhamoy Maitra, Indian Statistical Institute (ISI) Kolkata, India