We report a new correlated phase of two-dimensional charged carriers in high magnetic fields, manifested by an anisotropic insulating behavior at low temperatures. It appears near Landau level filling factor ν=1/2 in hole systems confined to wide GaAs quantum wells when the sample is tilted in magnetic field to an intermediate angle. The parallel field component (B∣∣) leads to a crossing of the lowest two Landau levels, and an elongated hole wavefunction in the direction of B∣∣. Under these conditions, the in-plane resistance exhibits an insulating behavior, with the resistance along B∣∣ more than 10 times smaller than the resistance perpendicular to B∣∣. We interpret this anisotropic insulating phase as a two-component, striped Wigner crystal.
@article{arxiv.1601.07135,
title = {Observation of An Anisotropic Wigner Crystal},
author = {Yang Liu and S. Hasdemir and L. N. Pfeiffer and K. W. West and K. W. Baldwin and M. Shayegan},
journal= {arXiv preprint arXiv:1601.07135},
year = {2016}
}