Wigner crystal in a two-dimensional electron system in the vicinity of filling factor 1/5: Acoustic studies

I. L. Drichko, I. Yu. Smirnov, A. V. Suslov, L. N. Pfeiffer, K. W. West, Y. M. Galperin

Published 2015-11-17Version 1

By simultaneous measurements of the attenuation and velocity of surface acoustic waves propagating in proximity to a high-quality GaAs quantum well we study the complex AC conductance of the two-dimensional electron system. Focusing on the vicinity of the filling factor $\nu=1/5$ we confirm that the insulating states formed closely to this value of $\nu$ are pinned Wigner crystals.