论文标题
通过双量子井在快速脉冲光发射时电子密度和电流的密度矩阵和时空分布
Density matrix and space-time distributions of the electronic density and current at fast pulsed photoemission through a double quantum well
论文作者
论文摘要
在密度矩阵方法的框架内，获得的通用公式很方便，用于描述在光电阴极内部放松过程的时间少于或下方发生的快速脉冲光发射。通过求解动力学方程来发现密度矩阵元素的表达式，该方程考虑了电子的交替电磁场和电子的非弹性散射。衍生的公式用于用于在通过在体积平面光值上沉积的双孔量子孔异质结构的光电脉冲的一维时空时空调制的一维时空调制模型的数值分析研究。该调制是一种量子拍打，这是由于激发和随后的慢速振动衰减而导致的，振荡的震动衰减是异质结构的准平稳状态的叠加。当光电极暴露于光脉冲的周期序列时，可以提供延长产生的延长，甚至扩增光电子的波浪和电流密度。
Within the framework of the density matrix method, general formulas obtained that are convenient for describing fast pulsed photoemission that occurs in a time less than or on the order of the times of relaxation processes inside the photocathode. Expressions for the elements of the density matrix are found by solving the kinetic equation that takes into account the alternating electromagnetic field of light pumping and inelastic scattering of electrons. The derived formulas are applied for the numerical-analytical study of a one-dimensional model of wave-like spatiotemporal modulation of a photoelectron pulse of suitable duration during its passage through a double-well quantum-well heterostructure deposited on a volumetric planar photocathode. This modulation is a quantum beat that occurs as a result of excitation and subsequent slow oscillatory decay of the superposition of the doublet of quasi-stationary states of the heterostructure. It is possible to provide prolongation of generation and even amplification of waves of charge density and current density of photoelectrons when the photocathode is exposed to a periodic sequence of light pulses.
