Fermi liquid to Bose condensate crossover in a two-dimensional ultracold gas experiment

T.V. Barmashova, K.A. Martiyanov, V.B. Makhalov, A.V. Turlapov
Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, ul. Ulyanova 46, Nizhny Novgorod, 603000, Russian Federation

By controlling interparticle interactions it is possible to transform a fermionic system into a bosonic system and vice versa while preserving quantum degeneracy. Evidence of such a transformation may be found by monitoring the pressure and interference. The Fermi pressure is an indication of the fermionic character of a system, while the interference implies a nonzero order parameter and Bose condensation. Changing from three to two spatial dimensions introduces new physics and makes the system more difficult to describe due to the increased fluctuations and the reduced applicability of mean-field methods. An experiment with a two-dimensional ultracold atomic gas shows a crossover between the Bose and Fermi limits, as evident from the value of pressure and from the interference pattern, and provides data to test models of 2D Fermi and Bose systems, including the most-difficult-to-model strongly coupled systems.

Keywords: ultracold atomic and molecular gases, Bose gas, Fermi gas, Fermi-to-Bose crossover, Fermi liquid, Bose—Einstein condensation, matter-wave interference
PACS: 03.75.Lm, 05.30.Fk, 67.85.−d, 74.78.−w (all)
DOI: 10.3367/UFNe.0186.201602i.0183
URL: https://ufn.ru/en/articles/2016/2/i/
Web of Science

000377714800009
Scopus

2-s2.0-84973119754
ADS NASA

2016PhyU...59..174B
Citation: Barmashova T V, Martiyanov K A, Makhalov V B, Turlapov A V "Fermi liquid to Bose condensate crossover in a two-dimensional ultracold gas experiment" Phys. Usp. 59 174–183 (2016)

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Received: 1st, December 2015, accepted: 28th, October 2015

Оригинал: Бармашова Т В, Мартьянов К А, Махалов В Б, Турлапов А В «Плавный переход от ферми-жидкости к бозе-конденсату в эксперименте с двумерным ультрахолодным газом» УФН 186 183–192 (2016); DOI: 10.3367/UFNr.0186.201602i.0183

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