Surface acoustic wave wavelength and temperature dependence of the induced periodic density modulation effect at ν=1/2

Abstract

The effects of a tunable periodic density modulation imposed upon a 2D electron system have been probed using surface acoustic waves. A substantial effect is induced at filling factor 1/2 in which the Fermi surface properties of the composite fermion are anisotropically replaced by features similar to those seen in quantum Hall states. The response measured using different SAW wavelengths and similarities in the temperature dependence between the modulation induced features at 1/2 and quantum Hall states are described.