TY - JOUR
T1 - Transition from the Bose-Einstein condensate to the Berezinskii-Kosterlitz-Thouless phase
AU - Simula, Tapio
AU - Lee, M
AU - Hutchinson, D
PY - 2005
Y1 - 2005
N2 - We obtain a phase diagram for a trapped two-dimensional ultracold Bose gas. We find a critical temperature above which the free energy of a state with a pair of vortices of opposite circulation is lower than that for a vortex-free Bose-Einstein condensed ground state. We identify three distinct phases which are, in order of increasing temperature, a phase coherent Bose-Einstein condensate, a vortex pair plasma with a fluctuating condensate phase, and a thermal Bose gas. The existence of the vortex pair phase could be verified using current experimental set-ups.
AB - We obtain a phase diagram for a trapped two-dimensional ultracold Bose gas. We find a critical temperature above which the free energy of a state with a pair of vortices of opposite circulation is lower than that for a vortex-free Bose-Einstein condensed ground state. We identify three distinct phases which are, in order of increasing temperature, a phase coherent Bose-Einstein condensate, a vortex pair plasma with a fluctuating condensate phase, and a thermal Bose gas. The existence of the vortex pair phase could be verified using current experimental set-ups.
UR - http://www.ingentaconnect.com.ezproxy.lib.monash.edu.au/content/tandf/tphl/2005/00000085/00000008/art00002?token=004912d51067232d45232b6c245a6a532c744
U2 - 10.1080/09500830500256587
DO - 10.1080/09500830500256587
M3 - Letter
SN - 0950-0839
VL - 85
SP - 395
EP - 403
JO - Philosophical Magazine Letters
JF - Philosophical Magazine Letters
IS - 8
ER -