Rabi脉冲作用下态相关光晶格中冷原子的局域化
Localization of cold atoms in state-dependent optical lattices via a Rabi pulse
摘要：
提出了一种新的实现态相关光晶格中超冷原子非平衡态安德森局域化的方法。导致局部化的无序势是用拉比脉冲将一部分原子转移到不同的内部状态而产生的，其中晶格位点之间的隧穿被抑制。具有零隧穿的原子产生不同随机势的量子叠加，使移动原子局部化。我们研究了非相互作用和弱相互作用玻色子的拉比脉冲后移动原子的动力学，并且我们表明演化的波函数获得了具有指数衰减尾部的准稳态轮廓，这是安德森局域化的特征。的本地化长度被认为是增加与增加的无序和相互作用的强度，相反的是预期的平衡本地化。
英文摘要：
We propose a novel realization of Anderson localization in non-equilibrium states of ultracold atoms trapped in state-dependent optical lattices. The disorder potential leading to localization is generated with a Rabi pulse transfering a fraction of the atoms into a different internal state for which tunneling between lattice sites is suppressed. Atoms with zero tunneling create a quantum superposition of different random potentials, localizing the mobile atoms. We investigate the dynamics of the mobile atoms after the Rabi pulse for non-interacting and weakly interacting bosons, and we show that the evolved wavefunction attains a quasi-stationary profile with exponentially decaying tails, characteristic of Anderson localization. The localization length is seen to increase with increasing disorder and interaction strength, oppositely to what is expected for equilibrium localization.
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