Scattering by an oscillating barrier: Quantum, classical, and semiclassical comparison
Scattering by an oscillating barrier: Quantum, classical, and semiclassical comparison
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振荡势垒的散射：量子、经典和半经典比较
DOI：
10.1103/physreva.86.013622
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发表时间：
2012
影响因子：
2.9
通讯作者：
K. Das
中科院分区：
文献类型：
--
作者：
T. Byrd;M. Ivory;A. Pyle;S. Aubin;K. Mitchell;J. Delos;K. Das
我们使用三种不同的物理框架：量子、经典和半经典，对调幅势垒散射进行了详细的研究。经典物理学给出了散射粒子的能量和动量的界限，同时也为半经典理论提供了基础。我们使用半经典方法选择性地添加量子力学效应，如干涉和衍射。我们发现在量子动量分布和半经典动量分布之间有很好的一致性。我们的方法和结果可用于理解涉及时变势的输运机制的量子和经典方面，例如量子泵浦。
We present a detailed study of scattering by an amplitude-modulated potential barrier using three distinct physical frameworks: quantum, classical, and semiclassical. Classical physics gives bounds on the energy and momentum of the scattered particle, while also providing the foundation for semiclassical theory. We use the semiclassical approach to selectively add quantum-mechanical effects such as interference and diffraction. We find good agreement between the quantum and semiclassical momentum distributions. Our methods and results can be used to understand quantum and classical aspects of transport mechanisms involving time-varying potentials, such as quantum pumping.