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arXiv quant-ph/0206020quant-ph
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量子隧穿先驱者的时间尺度

Time scale of forerunners in quantum tunneling

G. Garcia-Calderon, Jorge Villavicencio, F. Delgado, J. G. Muga

摘要:

在由具有急剧开始的源或由量子快门产生的波的主要隧穿信号之前的先导通常与过势垒(非隧穿)分量相关联。我们证明,虽然这种关联是真实的距离大于穿透长度,较小的距离的先导是由下的障碍组件。我们发现它的特征到达时间与势垒能量和入射能量之间的差成反比,隧穿时间尺度不同于相位时间和Büttiker-Landauer(BL)时间。

英文摘要:

The forerunners preceding the main tunneling signal of the wave created by a source with a sharp onset or by a quantum shutter, have been generally associated with over-the-barrier (non-tunneling) components. We demonstrate that, while this association is true for distances which are larger than the penetration lenght, for smaller distances the forerunner is dominated by under-the-barrier components. We find that its characteristic arrival time is inversely proportional to the difference between the barrier energy and the incidence energy, a tunneling time scale different from both the phase time and the Büttiker-Landauer (BL) time.

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