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arXiv quant-ph/9806052quant-ph
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Klein Tunnelling和Klein Parnelling

Klein Tunnelling and the Klein Paradox

A Calogeracos, N Dombey

摘要:

通过考虑狄拉克方程中有限方阱或势垒的性质,重新评估了克莱因悖论。结果表明,当势足够强时,阱中会发生自发正电子发射。估计了该阱的真空电荷和寿命。如果阱足够宽,就会发出看似恒定的电流。这些现象是瞬态的,而隧道效应首先计算克莱因是时间无关的。克莱因隧穿是相对论波动方程的一种性质,不一定与粒子发射有关。库仑势在这种情况下进行了研究:它表明,足够大的$Z$的重核将绑定正电子。相应地,预期随着$Z$增加,库仑势垒将变得对正电子越来越透明。这是克莱因隧道效应的一个例子。

英文摘要:

The Klein paradox is reassessed by considering the properties of a finite square well or barrier in the Dirac equation. It is shown that spontaneous positron emission occurs for a well if the potential is strong enough. The vacuum charge and lifetime of the well are estimated. If the well is wide enough, a seemingly constant current is emitted. These phenomena are transient whereas the tunnelling first calculated by Klein is time-independent. Klein tunnelling is a property of relativistic wave equations, not necessarily connected to particle emission. The Coulomb potential is investigated in this context: it is shown that a heavy nucleus of sufficiently large $Z$ will bind positrons. Correspondingly, it is expected that as $Z$ increases the Coulomb barrier will become increasingly transparent to positrons. This is an example of Klein tunnelling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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