量子霍尔系统中的反相回旋-磁等离子体模
Antiphased Cyclotron-Magnetoplasma Mode in a Quantum Hall System
摘要：
用非弹性光散射（ILS）谱研究了二维电子气中的反相磁等离子体（MP）模。与同相MP模式不同，它是纯粹的量子激发，没有经典的等离子体模拟。结果表明，用一阶微扰法预测的反相和同相模的零动量简并度在{ \it e-e}相互作用下得到了提升.零动量能隙由反相模的负相关位移决定。实验上观察到的和理论上计算的二阶微扰方法内的这种移位，是成比例的半导体材料中的有效里德伯常量。
英文摘要：
An antiphased magnetoplasma (MP) mode in a two-dimensional electron gas (2DEG) has been studied by means of inelastic light scattering (ILS) spectroscopy. Unlike the cophased MP mode it is purely quantum excitation which has no classic plasma analogue. It is found that zero momentum degeneracy for the antiphased and cophased modes predicted by the first-order perturbation approach in terms of the {\it e-e} interaction is lifted. The zero momentum energy gap is determined by a negative correlation shift of the antiphased mode. This shift, observed experimentally and calculated theoretically within the second-order perturbation approach, is proportional to the effective Rydberg constant in a semiconductor material.
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