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Fermions from Cold Atoms to Neutron Stars: Benchmarking the Many-Body Problem (INT-11-1)March 14 - May 20, 2011Michael McNeil Forbes, Aurel Bulgac, Alexandros Gezerlis, Gora V. Shlyapnikov, Tin-Lun (Jason) Ho, Martin W. Zwierlein
Pairing in low density fermion systems: Open problems • Symmetric (unpolarized) systems • What is the size of the Cooper pair? • Nature 454, 739-743 (2008) • - Is there a pseudo-gap phase? • What is the best way to put it in evidence experimentally? • - Response of a paired system to a weak external field, RF spectroscopy.
Asymmetric (polarized/imbalanced) systems normal Gapless superfluid LOFF Son and Stephanov, 2005 Bulgac, Forbes, Schwenk, 2006
Going beyond the naïve BCS approximation (P-wave pairing) nb/nf = 2, 1, 0.5 (from upper to lower panel) Eliashberg approx. (blue) BCS approx. (black) Full momentum and frequency dependence of the self-consistent equations (red) Bulgac and Yoon, 2009
LOFF at unitarity Bulgac, Forbes, 2008