Fri, 10/20/2017 - 3:00pm to 4:00pm
DeMeritt 240
Colloquium
Prof. Mohit Randeria, Ohio State University

BCS-BEC Crossover and Strongly Interacting Fermi Gases

AbstractThe crossover from Bardeen-Cooper-Schrieffer (BCS) pairing to a Bose-Einstein condensate (BEC) of tightly bound pairs, with increasing attraction between fermions, has long been of interest in theoretical physics. The past decade has seen remarkable experimental developments in ultracold Fermi gases that have realized the BCS-BEC crossover in the laboratory, bringing with it fresh new insights into the very strongly interacting, unitary regime in the middle of this crossover.

I will begin with a pedagogical introduction to the crossover and describe progress in theory and in thermodynamic, transport and spectroscopic experiments in the strongly interacting regime [1]. I will also discuss the remarkable connections between the unitary Fermi gas and other areas of physics, including quark-gluon plasmas, gauge-gravity duality, and superconductivity. I will conclude with a very recent solid-state example [2] of the BCS-BEC crossover.

[1] M. Randeria and E. Taylor, Annual Reviews of Cond. Mat. Phys. 5, 209 (2014).
[2] S. Rinott, K.B. Chashka, A. Ribak, E. D. L. Rienks, A. Taleb-Ibrahimi, P. Le Fevre, F. Bertran, M. Randeria and A.Kanigel; Science Advances 3, e1602372 (2017).

Bio: Mohit Randeria is Professor of Physics at The Ohio State University. He studied at IIT, Delhi and Caltech and received his PhD from Cornell. His research interests in condensed matter theory span the range from quantum materials to ultra-cold atoms. He was awarded the 2002 ICTP Prize for Condensed Matter Physics.