Group seminar via Zoom: Doctoral Selection Seminar

July 21, 2023

Shobhit Saheb Dey, Department of Physics, Indian Institute of Technology Kharagpur
Group seminar via Zoom
Friday, July 21, 09:00 am (MEZ)


I would like to express my sincere gratitude to the institute for providing me with the opportunity to present my research in the Doctoral Selection Seminar. I will be mainly discussing my work
on exciton-polariton condensates from my master’s thesis and internship. Apart from this, allow me to spend some time on other undergraduate research projects like photonic heat transport and
optimal control systems.

Exciton-polaritons are quasiparticles formed with strong coupling between excitonic excitations(bound states of electrons and holes) and light in a microcavity. These systems exhibit remarkable phenomena like Bose-Einstein Condensation[1] and superfluidity[2]. Due to their inherent driven-dissipative nature and advantages like coherent emission of light, these systems are being developed as testbeds to probe many-body and nonequilibrium physics[3] similar to ultracold atoms. During my experimental research internship at Alberto Amo’s lab and my master’s thesis, I studied the emergence of turbulence, characterized by an inverse cascade of energy, in these condensates, which I will be talking about in the seminar.

During my undergraduate coursework, I had the opportunity to work with Luigi Amico on condensed matter theory. In this project, we proposed a novel way to realize Negative Differential Thermal Conductance(NDTC) in electronic circuits and published it in Physical Review B[4]. NDTC basically means to have heat transfer rate reduced by increasing thermal bias. To realize this, we modelled a superconducting circuit in the regime where heat is photonically transferred. Apart from this, I spent the first few undergrad years working on optimal control systems and embedded systems for autonomous ground vehicles. These techniques are transferable to projects I aim to work on as a doctoral candidate.
I am excited to present these research endeavours during the seminar and engage in fruitful discussions with the esteemed members. Once again, I express my gratitude for this invaluable opportunity and look forward to sharing my work with the scientific community at your prestigious institute.
(1) Deng, H.; Weihs, G.; Santori, C.; Bloch, J.; Yamamoto, Y. Science 2002, 298, 199–202.
(2) Amo, A.; Lefr `ere, J.; Pigeon, S.; Adrados, C.; Ciuti, C.; Carusotto, I.; Houdr  ́e, R.; Giacobino, E.;
Bramati, A. Nature Physics 2009, 5, 805–810.
(3) Real, B.; Jamadi, O.; Mili ́cevi ́c, M.; Pernet, N.; St-Jean, P.; Ozawa, T.; Montambaux, G.; Sagnes,
I.; Lamaıtre, A.; Le Gratiet, L., et al. In 2021 Conference on Lasers and Electro-Optics Europe
& European Quantum Electronics Conference (CLEO/Europe-EQEC), 2021, pp 1–1.
(4) Dey, S. S.; Timossi, G.; Amico, L.; Marchegiani, G. Physical Review B 2023, 107, 134510.

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