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arXiv · 1411.4060

Microwave spectroscopic studies of the bilayer electron solid states at low Landau filling in a wide quantum well

A. T. Hatke·Y. Liu·L. W. Engel·M. Shayegan·L. N. Pfeiffer·K. W. West·K. W. Baldwin
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Abstract

At the low Landau filling factor $(ν)$ 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.

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A. T. Hatke, Y. Liu, L. W. Engel, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin. 2014-11-14. Microwave spectroscopic studies of the bilayer electron solid states at low Landau filling in a wide quantum well. https://doi.org/10.1038/ncomms8071

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