Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-10-26
Phys. Rev. A 81, 013621 (2010)
Physics
Condensed Matter
Quantum Gases
18 pages, 13 figures. Figures changed since last version for clearer presentation. New discussion in section 2d on physical si
Scientific paper
10.1103/PhysRevA.81.013621
Two coupled BECs with a large population imbalance exhibit macroscopic quantum self-trapping (MQST) if the ratio of interaction energy to tunneling energy is above a critical value. Here we investigate effect of quantum fluctuations on MQST. In particular, we analyze the dynamics of a system of two elongated Bose gases prepared with a large population imbalance, where due to the quasi one dimensional character of the gas we no longer have true long range order, and the effect of quantum fluctuations is much more important. We show that MQST is possible in this system, but even when it is achieved it is not always dynamically stable. Using this instability one can construct states with sharply peaked momentum distributions around characteristic momenta dependent on system parameters. Our other finding is the nonmonotonic oscillating dependence of the decay rate of the MQST on the length of the wires. We also address the interesting question of thermalization in this system and show that it occurs only in sufficiently long wires.
Hipolito Rafael
Polkovnikov Anatoli
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