Breakdown of the fermi liquid description for strongly interacting fermions

Physical Review Letters
Yoav SagiDeborah S Jin

Abstract

The nature of the normal state of an ultracold Fermi gas in the BCS-BEC crossover regime is an intriguing and controversial topic. While the many-body ground state remains a condensate of paired fermions, the normal state must evolve from a Fermi liquid to a Bose gas of molecules as a function of the interaction strength. How this occurs is still largely unknown. We explore this question with measurements of the distribution of single-particle energies and momenta in a nearly homogeneous gas above T(c). The data fit well to a function that includes a narrow, positively dispersing peak that corresponds to quasiparticles and an "incoherent background" that can accommodate broad, asymmetric line shapes. We find that the quasiparticle's spectral weight vanishes abruptly as the strength of interactions is modified, which signals the breakdown of a Fermi liquid description. Such a sharp feature is surprising in a crossover.

References

Mar 6, 2004·Physical Review Letters·C A RegalD S Jin
Aug 8, 2009·Physical Review Letters·André SchirotzekMartin W Zwierlein
Feb 26, 2010·Nature·S NascimbèneC Salomon
Apr 7, 2010·Physical Review Letters·Piotr MagierskiJoaquín E Drut
Sep 28, 2010·Physical Review Letters·J T StewartD S Jin
Apr 15, 2011·Nature·Ariel SommerMartin W Zwierlein
Jun 4, 2011·Physical Review Letters·E D KuhnleC J Vale
Jun 28, 2011·Physical Review Letters·S NascimbèneC Salomon
Feb 2, 2013·Physical Review Letters·Yoav SagiDeborah S Jin

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Citations

Jul 1, 2016·Proceedings of the National Academy of Sciences of the United States of America·Sebastian KrinnerTilman Esslinger
May 6, 2015·Scientific Reports·Elmer V H Doggen, Jami J Kinnunen
Jul 28, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Sebastian KrinnerJean-Philippe Brantut
Jul 8, 2017·Reports on Progress in Physics·Erich J Mueller
Dec 19, 2015·Science·Dominik HusmannJean-Philippe Brantut
Oct 10, 2015·Physical Review Letters·Marko CetinaGeorg M Bruun
Jul 15, 2017·Physical Review Letters·Shovan Dutta, Erich J Mueller
Apr 10, 2019·Nature Communications·W XuB DeMarco
Jun 8, 2019·Physical Review Letters·Biswaroop MukherjeeMartin W Zwierlein
Sep 20, 2018·Physical Review Letters·Constantine ShkedrovYoav Sagi
May 1, 2021·Physical Review Letters·Yun LongColin V Parker

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