Localized phase structures growing out of quantum fluctuations in a quench of tunnel-coupled atomic condensates.
Localized phase structures growing out of quantum fluctuations in a quench of tunnel-coupled atomic condensates.
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隧道耦合原子凝聚体淬灭中量子涨落产生的局域相结构
DOI：
10.1103/physrevlett.109.085304
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发表时间：
2012
影响因子：
8.6
通讯作者：
Florian Marquardt
中科院分区：
文献类型：
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作者：
Clemens Neuenhahn;Anatoli Polkovnikov;Florian Marquardt
研究了突然开启隧道耦合后，两个弱相互作用的玻色原子一维凝聚体之间的相对相位。下面的相动力学由量子sine-Gordon方程控制。在弱相互作用的半经典极限下，我们观察到量子涨落的参量放大，导致有限寿命呼吸子的形成。这些“准呼吸者”的典型的寿命和密度，来自采用经典的正弦戈登方程的精确解。两者都依赖于冷凝物之间的初始相对相位，这被认为是一个可调参数。
We investigate the relative phase between two weakly interacting 1D condensates of bosonic atoms after suddenly switching on the tunnel coupling. The following phase dynamics is governed by the quantum sine-Gordon equation. In the semiclassical limit of weak interactions, we observe the parametric amplification of quantum fluctuations leading to the formation of breathers with a finite lifetime. The typical lifetime and density of these “quasibreathers” are derived employing exact solutions of the classical sine-Gordon equation. Both depend on the initial relative phase between the condensates, which is considered as a tunable parameter.