Acoustoelectric current for composite fermions - art. no. 035301

The acoustoelectric current for composite fermions in a two-dimensional ele ctron gas (2DEG) close to the half-filled Landau level is calculated in the random phase approximation. The Boltzmann equation is used to find the non equilibrium distribution of composite fermions to second order in the acous tic field. It is shown that the oscillating Chern-Simons field created by t he induced density fluctuations in the 2DEG is important for the acoustoele ctric 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 long itudinal and the Hall components of the acoustoelectric current. This depar ture from the Weinreich relation gives additional information on the proper ties of the composite fermion fluid.