三势垒异质结准定态偶激发和衰变与高斯波包散射形成几率密度波和几率电流密度波
Formation of probability density waves and probability current density waves by excitation and decay of a doublet of quasistationary states of a three-barrier heterostructure upon scattering of gaussian wave packets
摘要：
对谱宽为准定态二重态能级间距量级的电子高斯波包的三势垒异质结散射进行了数值分析模拟。结果表明，由于散射作用，在双阱外形成了电子电荷密度和电流密度的阻尼波，其特性由初始波包的结构和散射振幅的极点决定。这些波的频率等于偶极子的差频，波数是具有共振能量的电子自由运动的波数之差，它们的传播速度是这些量的比率。如果通过一系列相干波包的散射来提供对双重态粒子数的周期性共振泵浦，则系统可以进入电子波发射的重复或放大的状态。
英文摘要：
A numerical-analytical simulation of scattering by a three-barrier heterostructure of an electronic Gaussian wave packet, the spectral width of which is on the order of the distance between the levels of the doublet of quasi-stationary states, is carried out. It is shown that as a result of scattering, damped waves of electron charge and current densities are formed outside the double well, their characteristics are determined by the structure of the initial wave packet and the poles of the scattering amplitudes. The frequency of these waves is equal to the difference frequency of the doublet, the wavenumber is the difference between the wave numbers of free motion of electrons with resonant energies, and the speed of their propagation is the ratio of these quantities. The system can go into the regime of repetition or amplification of the emission of electron waves if a periodic resonant pumping of the doublet population is provided by scattering of a series of coherent wave packets.
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