Acoustoelectric pumping through a ballistic point contact in the presence of magnetic fields - art. no. 195308

The acoustoelectric current J induced in a ballistic point contact (PC) by a surface acoustic wave is calculated in the presence of a perpendicular ma gnetic field B. It is found that the dependence of the current on the Fermi energy in the terminals is strongly correlated with that of the PC conduct ance: J is small at the conductance plateaus and is large at the steps. Lik e the conductance, the acoustoelectric current has the same functional beha vior as in the absence of a field, but with renormalized energy scales, whi ch depend on the strength of the magnetic field \B\.