Onset of a Pseudogap Regime in Ultracold Fermi Gases

Piotr Magierski , Gabriel Wlazłowski , Aurel Bulgac

Abstract

We show, using an ab initio approach based on Quantum Monte Carlo technique, that the pseudogap regime emerges in ultracold Fermi gases close to the unitary point. We locate the onset of this regime at a value of the interaction strength corresponding to (kFa)-1≈-0.05 (a—scattering length). We determine the evolution of the gap as a function of temperature and interaction strength in the Fermi gas around the unitary limit and show that our results exhibit a remarkable agreement with the recent wave-vector resolved radio frequency spectroscopy data. Our results indicate that a finite temperature structure of the Fermi gas around unitarity is more complicated and involves the presence of the phase with preformed Cooper pairs, which, however, do not contribute to the long range order.
Author Piotr Magierski (FP / NPD)
Piotr Magierski,,
- Nuclear Physics Division
, Gabriel Wlazłowski (FP / NPD)
Gabriel Wlazłowski,,
- Nuclear Physics Division
, Aurel Bulgac
Aurel Bulgac,,
-
Journal seriesPhysical Review Letters, ISSN 0031-9007, (A 45 pkt)
Issue year2011
Vol107
No14
Pages145304
ASJC Classification3100 General Physics and Astronomy
DOIDOI:10.1103/PhysRevLett.107.145304
URL http://link.aps.org/doi/10.1103/PhysRevLett.107.145304
Score (nominal)45
Score sourcejournalList
Publication indicators WoS Citations = 44; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 2.905; WoS Impact Factor: 2011 = 7.37 (2) - 2011=7.013 (5)
Citation count*38 (2016-06-20)
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