为什么磁化量子线可以作为有源laser介质
Why a magnetized quantum wire can act as an active laser medium
摘要：
本文研究了在垂直磁场作用下，简谐势量子线中磁等离子体激元激发的基本问题。本文在Bohm-Pines随机相位近似的框架下研究了两子带模型中的电荷密度激发。从本质上讲，我们的研究重点是子带间（磁子）集体激发，它在与各自的单粒子连续体合并之前改变了两次群速度的符号。增益系数的计算表明了一个有趣而重要的应用：基于这种磁振子模式的电子器件可以充当{ \it有源}激光介质。
英文摘要：
The fundamental issues associated with the magnetoplasmon excitations are investigated in a quantum wire characterized by a confining harmonic potential and subjected to a perpendicular magnetic field. We embark on the charge-density excitations in a two-subband model within the framework of Bohm-Pines' random-phase approximation. Essentially, the focus of our study is the intersubband (magnetoroton) collective excitation which changes the sign of its group velocity twice before merging with the respective single-particle continuum. The computation of the gain coefficient suggests an interesting and important application: the electronic device based on such magnetoroton modes can act as an {\it active} laser medium.
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