报告题目：Nernst effect in superconductors across the critical temperature
摘要：
At the beginning of the present century, it was generally assumed that a BCS superconductor cannot produce a Nernst signal far above its critical temperature. This assumption was contradicted by subsequent experiments, which detected a transverse thermoelectric response generated by short-lived Cooper pairs deep in the normal state [1]. A recent surprise [2] is that the entropy carried by a mobile superconducting vortex is much smaller than what is stocked in the vortex core. Experimental data across different superconductors with vastly different critical temperatures indicate that the irreducible entropy of a superconducting vortex is of the order of kB per layer. I present recent data on superconducting NbN which links this universality to the melting entropy of the vortex lattice.
References：
1.K. Behnia & H. Aubin, Rep. Prog. Phys. 79, 046502 (2016)
2.C. W. Rischau et al., Phys. Rev. Lett. 126, 077001 (2021)
简 历：
Kamran Behnia is a senior researcher (Directeur de Recherche) of Centre National de la Recherche Scientifique (CNRS) at Ecole Supérieure de Physique et de Chimie Industrielles (ESPCI) in Paris. His research focuses on collective quantum phenomena in a variety of solids, ranging from semimetals to superconductors. He has published 388 papers which have received more than 12000 citations. His book Fundamentals of Thermoelectricity was published by Oxford University Press in 2015. He became a fellow of American Physical Society in 2012, and he was a Divisional Associate Editor of Physical Review Letters from 2014 to 2019 and a member of the Board of Reviewing Editors of Science from 2014 to 2018.