Anomalous Nematic States in High Half-Filled Landau Levels

It is well established that the ground states of a two-dimensional electron gas with half-filled high (N≥2) Landau levels are compressible charge-ordered states, known as quantum Hall stripe (QHS) phases. The generic features of QHSs are a maximum (minimum) in a longitudinal resistance R_{xx} (R_{yy...

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Published inPhysical review letters Vol. 124; no. 6; p. 067601
Main Authors Fu, X, Shi, Q, Zudov, M A, Gardner, G C, Watson, J D, Manfra, M J, Baldwin, K W, Pfeiffer, L N, West, K W
Format Journal Article
LanguageEnglish
Published United States 14.02.2020
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Summary:It is well established that the ground states of a two-dimensional electron gas with half-filled high (N≥2) Landau levels are compressible charge-ordered states, known as quantum Hall stripe (QHS) phases. The generic features of QHSs are a maximum (minimum) in a longitudinal resistance R_{xx} (R_{yy}) and a nonquantized Hall resistance R_{H}. Here, we report on emergent minima (maxima) in R_{xx} (R_{yy}) and plateaulike features in R_{H} in half-filled N≥3 Landau levels. Remarkably, these unexpected features develop at temperatures considerably lower than the onset temperature of QHSs, suggestive of a new ground state.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.124.067601