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arXiv physics/0505143physics.atom-phnlin.CDquant-ph
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准动量在原子光学受击转子共振动力学中的作用

The role of quasi-momentum in the resonant dynamics of the atom-optics kicked rotor

Sandro Wimberger, Mark Sadgrove

摘要:

我们研究了初始原子动量分布对量子踢转子的原子光学实现的动力学的影响。原子被脉冲光晶格踢,其周期性意味着准动量在输运问题中是守恒的。我们从实验和理论上研究和比较了被踢转子的两种共振极限:量子共振附近和踢周期消失的半经典极限。研究发现,对于相同的准动量分布,在量子共振附近,准动量的影响会导致系统偏离被踢转子模型,而在经典共振附近(即踢周期较小时),准动量的影响消失.

英文摘要:

We examine the effect of the initial atomic momentum distribution on the dynamics of the atom-optical realisation of the quantum kicked rotor. The atoms are kicked by a pulsed optical lattice, the periodicity of which implies that quasi-momentum is conserved in the transport problem. We study and compare experimentally and theoretically two resonant limits of the kicked rotor: in the vicinity of the quantum resonances and in the semiclassical limit of vanishing kicking period. It is found that for the same experimental distribution of quasi-momenta, significant deviations from the kicked rotor model are induced close to quantum resonance, while close to the classical resonance (i.e. for small kicking period) the effect of the quasi-momentum vanishes.

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