Antiphased Cyclotron-Magnetoplasma Mode in a Quantum Hall System

Abstract

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.

Submitted to Phys. Rev. B

References in corpus (5)

• The Cyclotron Spin-Flip Mode as the Lowest-Energy Excitation of Unpolarized Integer Quantum Hall States
• Zero-Momentum Cyclotron Spin-Flip Mode in a Spin-Unpolarized Quantum Hall System
• Activation Energy in a Quantum Hall Ferromagnet and Non-Hartree-Fock Skyrmions
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Cited by in corpus (4)

• Extra Spin-Wave mode in Quantum Hall systems. Beyond the Skyrmion Limit
• Competing Hyperfine and Spin-Orbit Couplings: Spin Relaxation in a Quantum Hall Ferromagnet
• Nonlinear electromagnetic response of a uniform electron gas
• Observation of exchange Coulomb interactions in the quantum Hall state at nu=3