Wigner solid pinning modes tuned by fractional quantum Hall states of a nearby layer

A. T. Hatke, H. Deng, Yang Liu, L. W. Engel, L. N. Pfeiffer, K. W. West, K. W. Baldwin, M. Shayegan

Research output: Contribution to journalArticle

Abstract

We studied a bilayer system hosting two-dimensional electron systems (2DESs) in close proximity but isolated from one another by a thin barrier. One 2DES has low electron density and forms a Wigner solid (WS) at high magnetic fields. The other has much higher density and, in the same field, exhibits fractional quantum Hall states (FQHSs). The WS spectrum has resonances which are understood as pinning modes, oscillations of the WS within the residual disorder. We found the pinning mode frequencies of the WS are strongly affected by the FQHSs in the nearby layer. Analysis of the spectra indicates that the majority layer screens like a dielectric medium even when its Landau filling is ~ 1 / 2 , at which the layer is essentially a composite fermion (CF) metal. Although the majority layer is only ~ one WS lattice constant away, a WS site only induces an image charge of ~0.1e in the CF metal.

Original languageEnglish (US)
Article numbereaao2848
JournalScience advances
Volume5
Issue number3
DOIs
StatePublished - 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • General

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    Hatke, A. T., Deng, H., Liu, Y., Engel, L. W., Pfeiffer, L. N., West, K. W., Baldwin, K. W., & Shayegan, M. (2019). Wigner solid pinning modes tuned by fractional quantum Hall states of a nearby layer. Science advances, 5(3), [eaao2848]. https://doi.org/10.1126/sciadv.aao2848