Nonadiabatic losses from radio-frequency-dressed cold-atom traps: Beyond the Landau-Zener model
Nonadiabatic losses from radio-frequency-dressed cold-atom traps: Beyond the Landau-Zener model
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DOI：
10.1103/physreva.96.023429
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发表时间：
2017-08
影响因子：
2.9
通讯作者：
K. Burrows;H. Perrin;B. Garraway
中科院分区：
文献类型：
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作者：
K. Burrows;H. Perrin;B. Garraway
非绝热衰减率的射频修饰的磁陷阱计算使用费米的黄金法则：也就是说，我们研究的概率为一个单一的原子，使过渡出修饰的陷阱，并进入一个连续的绝热极限，微扰理论可以应用。这种方法可以与共振缀饰原子陷阱的半经典朗道-齐纳理论相比较，并且发现，当仔细实施时，朗道-齐纳理论高估了绝热极限下非绝热自旋翻转跃迁的速率。这表明在确定实际原子阱中对陷阱拉比频率和磁场梯度的要求时需要小心。
Nonadiabatic decay rates for a radio-frequency-dressed magnetic trap are calculated using Fermi’s golden rule: that is, we examine the probability for a single atom to make transitions out of the dressed trap and into a continuum in the adiabatic limit, where perturbation theory can be applied. This approach can be compared to the semiclassical Landau-Zener theory of a resonant dressed atom trap, and it is found that, when carefully implemented, the Landau-Zener theory overestimates the rate of nonadiabatic spin-flip transitions in the adiabatic limit. This indicates that care is needed when determining requirements on trap Rabi frequency and magnetic-field gradient in practical atom traps.