Antiphased cyclotron-magnetoplasma mode in a quantum Hall system

作者：Kulik L V^*; Dickmann S; Drozdov I K; Zhuravlev A S; Kirpichev V E; Kukushkin I V; Schmult S; Dietsche W

来源：Physical Review B, 2009, 79(12): 121310.

DOI：10.1103/PhysRevB.79.121310

• aluminium compounds
• energy gap
• gallium arsenide
• III-V semiconductors
• perturbation theory
• quantum Hall effect
• semiconductor heterojunctions
• semiconductor quantum wells

An antiphased magnetoplasma (MP) mode in a two-dimensional electron gas has been studied by means of inelastic light-scattering spectroscopy. Unlike the cophased MP mode, it is purely quantum excitation which has no classic plasma analog. It is found that zero-momentum degeneracy for the antiphased and cophased modes predicted by the first-order perturbation approach in terms of the electron-electron 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.

• 出版日期2009-3