Wigner crystal in a two-dimensional electron system in the vicinity of filling factor 1/5: Acoustic studies
arXiv:1511.05376 · doi:10.1016/j.ssc.2015.04.018
Abstract
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 $ν=1/5$ we confirm that the insulating states formed closely to this value of $ν$ are pinned Wigner crystals.
6 pages, 6 figures