Onset of a Pseudogap Regime in Ultracold Fermi Gases
Piotr Magierski , Gabriel Wlazłowski , Aurel Bulgac
AbstractWe 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.
|Journal series||Physical Review Letters, ISSN 0031-9007, (A 45 pkt)|
|Publication indicators||= 44; : 2011 = 2.905; : 2011 = 7.37 (2) - 2011=7.013 (5)|
|Citation count*||38 (2016-06-20)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.