Quantum resonances and decoherence for δ-kicked atoms
Quantum resonances and decoherence for δ-kicked atoms
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δ-踢原子的量子共振和退相干
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Fishman
中科院分区：
文献类型：
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作者：
S. Wimberger;I. Guarneri;S. Fishman
详细分析了当踢踢周期为半δ时间的整数倍时，被踢踢原子发生的量子共振。在完全相干动力学和自发辐射引起退相干的情况下，建立了精确共振时的动量分布的精确结果。利用准经典近似推导出踢腿周期接近共振时的动力学描述，其中精确共振的失谐量起到普朗克常数的作用。通过这种方法，得到了描述共振峰形状的标度律。这样的分析结果得到了广泛的数值模拟的支持，并解释了最近一些令人惊讶的实验观察。
The quantum resonances occurring with δ-kicked atoms when the kicking period is an integer multiple of the half-Talbot time are analysed in detail. Exact results about the momentum distribution at exact resonance are established, both in the case of totally coherent dynamics and in the case when decoherence is induced by spontaneous emission. A description of the dynamics when the kicking period is close to, but not exactly at resonance, is derived by means of a quasi-classical approximation where the detuning from exact resonance plays the role of the Planck constant. In this way scaling laws describing the shape of the resonant peaks are obtained. Such analytical results are supported by extensive numerical simulations, and explain some recent surprising experimental observations.