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Special ICMT Seminar: "Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions""

Speaker Qijin Chen, Zhejiang University
Date: 4/27/2017
Time: 2 p.m.
Location:

190 ESB

Sponsor:

Institute for Condensed Matter Physics

Event Type: Seminar/Symposium
 

The exotic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states have been actively searched for experimentally since the mean-field based FFLO theories were put forward half a century ago.  In this talk, I shall present an investigation of the stability of FFLO states against unavoidable pairing fluctuations, and conclude that FFLO FFLO superfluids cannot exist due to their intrinsic instability in three and two dimensions. This explains their absence in experimental observations in both condensed matter systems and the most recent, more promising ultracold atomic Fermi gases with a population imbalance. We postulate that the system will form a Bose metal, with possible pair density waves without superfluidity.

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