Department of Chemistry, Ben-Gurion University of the Negev, Post Office Box 653, Beer-Sheva 84105, Israel.
Phys Rev Lett. 2010 Jun 18;104(24):240402. doi: 10.1103/PhysRevLett.104.240402. Epub 2010 Jun 15.
We study the collective dynamics of a driven two-mode Bose-Hubbard model in the Josephson interaction regime. The classical phase space is mixed, with chaotic and regular components, which determine the dynamical nature of the fringe visibility. For a weak off-resonant drive, where the chaotic component is small, the many-body dynamics corresponds to that of a Kapitza pendulum, with the relative phase φ between the condensates playing the role of the pendulum angle. Using a master equation approach we show that the modulation of the intersite potential barrier stabilizes the φ=π "inverted pendulum" coherent state, and protects the fringe visibility.
我们研究了约瑟夫森相互作用区驱动的双模玻色-哈伯德模型的集体动力学。经典相空间是混合的，具有混沌和规则成分，这决定了条纹可见度的动力学性质。对于弱非共振驱动，其中混沌成分较小，多体动力学对应于卡皮察摆的动力学，其中凝聚体之间的相对相位 φ 扮演摆角的角色。我们使用主方程方法表明，介位势垒的调制稳定了 φ=π 的“倒立摆”相干态，并保护了条纹可见度。
