Shrestha Uttam, Kostrun Marijan, Javanainen Juha
Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA.
Phys Rev Lett. 2008 Aug 15;101(7):070406. doi: 10.1103/PhysRevLett.101.070406.
We find numerically that in the limit of weak atom-atom interactions a Bose-Einstein condensate in an optical lattice may develop a pulsating dynamical instability in which the atoms nearly periodically form a peak in the occupation numbers of the lattice sites, and then return to the unstable initial state. Multiple peaks behaving similarly are also found. Simple arguments show that the pulsating instability is a remnant of integrability, and give a handle on the relevant physical scales.
我们通过数值计算发现，在弱原子 - 原子相互作用的极限情况下，光学晶格中的玻色 - 爱因斯坦凝聚体可能会出现一种脉动动力学不稳定性，其中原子几乎周期性地在晶格位点的占据数中形成一个峰值，然后回到不稳定的初始状态。还发现了多个表现类似的峰值。简单的论证表明，脉动不稳定性是可积性的残余，并给出了相关物理尺度的处理方法。
