Antiphased Cyclotron-Magnetoplasma Mode in a Quantum Hall System

Details Antiphased Cyclotron-Magnetoplasma Mode in a Quantum Hall System Antiphased Cyclotron-Magnetoplasma Mode in a Quantum Hall System

2008-12-08

arxiv.org/abs/0812.1489v1

Phys. Rev. B 79, 121310(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.121310

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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