双波纹弹道电子波导的谐振宽度振荡
Resonance width oscillation in the bi-ripple ballistic electron waveguide
摘要：
研究了弹道电子波纹波导中准束缚态的干涉，该波导具有两个间距可变的波纹腔。该系统是Dicke辐射场中相互作用原子模型的波导模拟。迪克的模型具有共振，其宽度随着原子之间的距离变化而以振荡的方式变化。在双波纹波导中形成的谐振的行为方式与迪克的系统有一些相似之处，但也有重要的区别。我们数值研究了波导中的谐振宽度随两个波纹腔之间距离的变化的行为，我们发现谐振宽度随距离的变化而振荡，但耦合并不像Dicke系统那样减小。我们讨论了我们的波导系统和其他类似Dicke效应的系统之间的差异。我们还研究了S-矩阵极轨线，发现它们在复能量平面上绕圆逆时针旋转。
英文摘要：
Interference of quasi bound states is studied in a ballistic electron ripple waveguide with two ripple cavities whose distance apart can be varied. This system is the waveguide analog of Dicke's model for two interacting atoms in a radiation field. Dicke's model has resonances whose widths change in an oscillatory manner as the distance between the atoms is varied. Resonances that form in a bi-ripple waveguide behave in a manner that has some similarity to Dicke's system, but also important differences. We numerically investigate the behavior of resonance widths in the waveguide as the distance between the two ripple cavities changes and we find that the resonance widths oscillate with variation of distance, but the coupling does not decrease as it does in Dicke's system. We discuss differences between our waveguide system and other systems showing the analogous of Dicke effect. We also study S-matrix pole trajectories and find that they rotate in counterclockwise direction on a circle in the complex energy plane.
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