Dynamics in ultracold atomic superfluid gases at finite temperatures

Leifeng Zhang, Jibiao Wang, Yi Yu +1 more

Zhen-Fei Zheng, Guang‐Can Guo, Zhen Zheng +1 more

Allan Griffin, Tetsuro Nikuni, E. Zaremba

The discovery of Bose Einstein condensation (BEC) in trapped ultracold atomic gases in 1995 has led to an explosion of theoretical and experimental research on the properties of Bose-condensed dilute gases. The first treatment of BEC at finite temperatures, this book presents a thorough account of the theory of two-component dynamics and nonequilibrium behaviour in superfluid Bose gases. It uses a simplified microscopic model to give a clear, explicit account of collective modes in both the collisionless and collision-dominated regions. Major topics such as kinetic equations, local equilibrium and two-fluid hydrodynamics are introduced at an elementary level. Explicit predictions are worked out and linked to experiments. Providing a platform for future experimental and theoretical studies on the finite temperature dynamics of trapped Bose gases, this book is ideal for researchers and graduate students in ultracold atom physics, atomic, molecular and optical physics and condensed matter physics.

有希 遠藤

Gretchen K. Campbell

Saeed Ghanbari, Tien D. Kieu, Joel Frederick Corney

We simulate quantum degenerate Bose gases at finite temperatures in a grand canonical ensemble and use the Bose-Hubbard model which can describe the dynamics of ultracold bosonic atoms in optical and magnetic lattices. We study ultracold atoms with the gauge P-representation in 1D with 1, 2 (double well), 3, 7 and 11 sites and study quantum correlations and other physical quantities at different temperatures across the superfluid to Mott insulator quantum phase transition. Moreover, using a truncated number-state basis and the gauge P-representation, we show that the Mott lobes are not present unless the temperature is below a certain value.