Acoustoelectric current for composite fermions
arXiv:cond-mat/9911234 · doi:10.1103/PhysRevB.64.035301
Abstract
The acoustelectric current for composite fermions in a two-dimensional electron gas (2DEG) close to the half-filled Landau level is calculated in the random phase approximation. The Boltzmann equation is used to find the nonequilibrium distribution of composite fermions to second order in the acoustic field.It is shown that the oscillating Chern-Simons field created by the induced density fluctuations in the 2DEG is important for the acoustoelectric current. This leads to a violation of the Weinreich relation between the acoustoelectric current and acoustic intensity. The deviations from the Weinreich relation can be detected by measuring the angle between the longitudinal and the Hall components of the acoustoelectric current. This departure from the Weinreich relation gives additional information on the properties of the compostite fermion fluid.
7 pages, 2 figures, Major revision, corrected treatment of Chern-Simons fields
References in corpus (3)
- High-frequency hopping conductivity in the quantum Hall effect regime: Acoustical studies
- Electron localization in sound absorption oscillations in the quantum Hall effect regime
- Interaction of surface acoustic waves with a two-dimensional electron gas in the presence of spin splitting of the Landau bands