Tuesday, May 21, 2013

1305.4411 (Vasiliy Makhalov et al.)

Ground state pressure of quasi-two-dimensional Fermi and Bose gases    [PDF]

Vasiliy Makhalov, Kirill Martiyanov, Andrey Turlapov
Using an ultracold gas of atoms, we have realized a quasi-two-dimensional Fermi system with widely tunable s-wave interactions nearly in a ground state. Pressure and density are measured. The experiment covers physically different regimes: weakly- and strongly-attractive Fermi gases and a Bose gas of tightly-bound pairs of fermions. In the Fermi regime of weak interactions, the pressure is systematically above a Fermi-liquid-theory prediction probably due to mesoscopic effects. In the opposite Bose regime, the pressure agrees with a mean-filed theory of point-like bosons in an unexpectedly wide range. Reported measurements, especially in the challenging strongly-interacting regime, may serve for sensitive testing of theoretical methods applicable across different quantum physics disciplines.
View original: http://arxiv.org/abs/1305.4411

No comments:

Post a Comment