Abstract
We show that the onset of superfluidity in a finite homogeneous 2D Bose gas is associated with the appearance of an anomalous thermal density induced by the presence of a finite-size condensate. We investigate the temporal frequency signatures of the Bose field, and show that thermally excited vortices in the field are weakly coupled to the longitudinal excitations. We apply the concept of locking of the superfluid velocity field by the condensate to estimate the superfluid density in a metastable circulating flow of a superfluid Bose gas in a 2D toroidal geometry.
© 2011 AOS
PDF ArticleMore Like This
Chao Feng, Tod Wright, and Matthew J. Davis
C1010 Conference on Lasers and Electro-Optics/Pacific Rim (CLEO/PR) 2011
Matthew J. Davis, Tod M. Wright, Tapio Simula, Chao Feng, and Michael C. Garrett
I1043 International Quantum Electronics Conference (IQEC) 2011
Peter Krüger, Zoran Hadzibabic, and Jean Dalibard
CWB2 Conference on Coherence and Quantum Optics (CQO) 2007