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arXiv 1409.2889quant-ph
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含时势垒和超到时

Time-dependent potential barriers and superarrivals

H. Karami, S. V. Mousavi

摘要:

数值研究了高斯波包在宽度和高度均为递增的矩形势垒上的散射。可以看出,在一定的时间间隔期间,与相应的未扰动情况相比,随时间演化的传输概率增加。在文献中,这种效应被称为传输概率中的超到达。我们提出了一个基于量子力学的解释,这种效果通过使用量子势能的概念和计算选择的玻姆轨迹。在波包色散过程中势垒宽度线性增加的情况下,确定了超到时的相关参数。还考虑了非线性时间扰动。

英文摘要:

Scattering of a Gaussian wavepacket from rectangular potential barriers with increasing widths or heights is studied numerically. It is seen that during a certain time interval the time-evolving transmission probability increases compared to the corresponding unperturbed cases. In the literature this effect is known as superarrival in transmission probability. We present a trajectory-based explanation for this effect by using the concept of quantum potential energy and computing a selection of Bohmian trajectories. Relevant parameters in superarrivals are determined for the case that the barrier width increases linearly during the dispersion of the wavepacket. Nonlinear in time perturbation is also considered.

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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