Institute for Physics of Microstructures RAS, Nizhny Novgorod, Russia.
J Phys Condens Matter. 2013 Sep 11;25(36):365602. doi: 10.1088/0953-8984/25/36/365602. Epub 2013 Aug 8.
We report a theoretical study on magnetoplasmon excitations in a perpendicular magnetic field in n-type narrow-gap quantum wells (QWs). Using the Hartree-Fock approximation based on the 8 × 8 k · p Hamiltonian, we calculate magnetoplasmon dispersions in symmetric and asymmetric InAs/AlSb QWs for the case of integer-filled Landau levels. We demonstrate a significant dependence of the shape of magnetoplasmon dispersions on the 2D electron concentration, as well as a nonlinear dependence of the magnetoplasmon energy on the wavevector at small values of k. Both effects are shown to result from strong mixing between the conduction (Γ6) and the valence (Γ7 and Γ8) bands. We find that cyclotron-resonance (CR) energies are affected by electron-electron interaction due to Kohn theorem violation and predict the interaction-induced enhancement of the CR line splitting in the case of even (Δg-splitting) and odd (Δm-splitting) filling factors for the Landau levels.
我们报告了在垂直磁场中 n 型窄能隙量子阱（QW）中磁等离子体激发的理论研究。使用基于 8×8 k·p 哈密顿量的哈特ree-fock 近似，我们计算了整数填充朗道能级情况下对称和非对称 InAs/AlSb QW 中的磁等离子体色散。我们表明，磁等离子体色散的形状对 2D 电子浓度有很大的依赖性，并且在小 k 值下，磁等离子体能量对波矢的依赖性是非线性的。这两种效应都归因于导带（Γ6）和价带（Γ7 和 Γ8）之间的强烈混合。我们发现，由于科恩定理的违反，回旋共振（CR）能量受到电子-电子相互作用的影响，并预测了在朗道能级的偶数（Δg-分裂）和奇数（Δm-分裂）填充因子的情况下，CR 线分裂的相互作用增强。
