Physical properties of an ultracold Fermi gas in the temperature-coupling phase diagram can be characterized by the contact intensity C, which enters the pair-correlation function at short distances and describes how the two-body problem merges into its surrounding. We show that the local order established by pairing fluctuations about the critical temperature Tc of the superfluid transition considerably enhances the contact C in a temperature range where pseudogap phenomena are maximal. Our ab initio results for C in a trap compare well with recently available experimental data over a wide coupling range. An analysis is also provided for the effects of trap averaging on C.
Temperature and coupling dependence of the universal contact intensity for an ultracold Fermi gas / PALESTINI, FABRIZIO; PERALI, Andrea; PIERI, Pierbiagio; STRINATI CALVANESE, Giancarlo. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - STAMPA. - 82:2(2010), pp. 021605-1-021605-4. [10.1103/PhysRevA.82.021605]
Temperature and coupling dependence of the universal contact intensity for an ultracold Fermi gas
PIERI, Pierbiagio;
2010
Abstract
Physical properties of an ultracold Fermi gas in the temperature-coupling phase diagram can be characterized by the contact intensity C, which enters the pair-correlation function at short distances and describes how the two-body problem merges into its surrounding. We show that the local order established by pairing fluctuations about the critical temperature Tc of the superfluid transition considerably enhances the contact C in a temperature range where pseudogap phenomena are maximal. Our ab initio results for C in a trap compare well with recently available experimental data over a wide coupling range. An analysis is also provided for the effects of trap averaging on C.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.