Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...
TT 38.9: Vortrag
Freitag, 29. Februar 2008, 12:30–12:45, H 3010
Condensate formation in Bose-gas upon cooling — •Roman Saptsov1, Efim Brener1, and Sergey Iordanskiy2 — 1IFF, FZ-Jülich, Jülich, Germany — 2Landau Istitute for Theoretical Physics, Moscow, Russia
The mechanism for the transition of a Bose gas to the superfluid state via thermal fluctuations is considered. It is shown that in the process of external cooling some critical fluctuations (instantons) are formed above the critical temperature. The probability of the instanton formation is calculated. It is found that this probability increases as the system approaches the transition temperature.