How Landau-Zener Tunneling Takes Time

How Landau-Zener Tunneling Takes Time
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DOI:
10.1103/physrevlett.80.3491
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发表时间:
1998-04
影响因子:
8.6
通讯作者:
Q. Niu;M. Raizen
Q. Niu;M. Raizen
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Q. Niu;M. Raizen

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我们计算了加速光学晶格中原子的朗道-齐纳隧道效应的时间演化。获得的分析表达式与最近对非指数衰减的观察结果非常一致。我们确定了新的实验机制,这些机制显示了生存概率的时间演化中从强相干振荡到指数衰减的交叉。我们建立了这种交叉的时间尺度,并将其与齐纳击穿的隧道时间联系起来。
We calculate the time evolution of Landau-Zener tunneling for atoms in an accelerating optical lattice. Analytical expressions are obtained that are in good agreement with a recent observation of nonexponential decay. We identify new experimental regimes that show a crossover from strong coherent oscillations to exponential decay in the temporal evolution of the survival probability. We establish the time scale of this crossover, and make connection to a tunneling time of Zener breakdown.