%0 Journal Article
%T Microwave spectroscopic studies of the bilayer electron solid states at low Landau filling in a wide quantum well
%A A. T. Hatke
%A Y. Liu
%A L. W. Engel
%A M. Shayegan
%A L. N. Pfeiffer
%A K. W. West
%A K. W. Baldwin
%J Physics
%D 2014
%I arXiv
%R 10.1038/ncomms8071
%X At the low Landau filling factor $(\nu)$ termination of the fractional quantum Hall effect (FQHE) series, two-dimensional electron systems (2DESs) exhibit an insulating phase that is understood as a form of pinned Wigner solid. Here we use microwave spectroscopy to probe the transition to the insulator for a wide quantum well (WQW) sample that can support single-layer or bilayer states depending on its overall carrier density, $n$. We find the insulator exhibits a resonance, which is characteristic of a bilayer solid. The resonance also reveals a pair of transitions within the solid, which are not accessible to dc transport measurements. As $n$ is biased deeper into the bilayer solid regime, the resonance grows in specific intensity, and the transitions within the insulator disappear. These behaviors are suggestive of a picture of the insulating phase as an emulsion of liquid and solid components.
%U http://arxiv.org/abs/1411.4060v1