Wigner solids of wide quantum wells near Landau filling ν=1

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

Research output: Contribution to journalArticle

Abstract

Microwave spectroscopy within the Landau filling (ν) range of the integer quantum Hall effect (IQHE) has revealed pinning mode resonances signifying Wigner solids (WSs) composed of quasiparticles or -holes. We study pinning modes of WSs in wide quantum wells (WQWs) for 0.8≤ν≤1.2, varying the density, n, and tilting the sample by angle θ in the magnetic field. Three distinct WS phases are accessed. One phase, S1, is phenomenologically the same as the WS observed in the IQHEs of narrow QWs. The second phase, S2, exists at ν further from ν=1 than S1, and requires a sufficiently large n or θ, implying S2 is stabilized by the Zeeman energy. The melting temperatures of S1 and S2, estimated from the disappearance of the pinning mode, show different behavior versus ν. At the largest n or θ, S2 disappears and the third phase, S1A, replaces S1, also exhibiting a pinning mode. This occurs as the WQW ν=1 IQHE becomes a two-component, Halperin-Laughlin Ψ111 state. We interpret S1A as a WS of the excitations of Ψ111, which has not been previously observed.

Original languageEnglish (US)
Article number195309
JournalPhysical Review B
Volume98
Issue number19
DOIs
StatePublished - Nov 19 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Hatke, A. T., Liu, Y., Engel, L. W., Pfeiffer, L. N., West, K. W., Baldwin, K. W., & Shayegan, M. (2018). Wigner solids of wide quantum wells near Landau filling ν=1. Physical Review B, 98(19), [195309]. https://doi.org/10.1103/PhysRevB.98.195309