Observation of new plasmons in the fractional quantum Hall effect: Interplay of topological and nematic orders

Du, Lingjie; Wurstbauer, Ursula; West, Ken W.; Pfeiffer, Loren N.; Fallahi, Saeed; Gardner, Geoff C.; Manfra, Michael J.; Pinczuk, Aron

doi:10.1126/sciadv.aav3407

Observation of new plasmons in the fractional quantum Hall effect: Interplay of topological and nematic orders

Journal Article · Fri Mar 22 00:00:00 EDT 2019 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aav3407· OSTI ID:1610885

^[1]; ^[2]; West, Ken W. ^[3]; Pfeiffer, Loren N. ^[4]; Fallahi, Saeed ^[4]; ^[4]; Manfra, Michael J. ^[5]; ^[6]

Columbia Univ., New York, NY (United States; DOE/OSTI
Technische Univ. Munech, Garching (Germany); Univ. of Munster (Germany)
Princeton Univ., NJ (United States)
Purdue Univ., West Lafayette, IN (United States)
Purdue Univ., West Lafayette, IN (United States); School of Materials Engineering and School of Electrical and Computer Engineering, IN (United States)
Columbia Univ., New York, NY (United States

Collective modes of exotic quantum fluids reveal underlying physical mechanisms responsible for emergent quantum states. We observe unexpected new collective modes in the fractional quantum Hall (FQH) regime: intra–Landau-level plasmons measured by resonant inelastic light scattering. The plasmons herald rotational-symmetry-breaking (nematic) phases in the second Landau level and uncover the nature of long-range translational invariance in these phases. The intricate dependence of plasmon features on filling factor provides insights on interplays between topological quantum Hall order and nematic electronic liquid crystal phases. A marked intensity minimum in the plasmon spectrum at Landau level filling factorv= 5/2 strongly suggests that this paired state, which may support non-Abelian excitations, overwhelms competing nematic phases, unveiling the robustness of the 5/2 superfluid state for small tilt angles. Atv= 7/3, a sharp and strong plasmon peak that links to emerging macroscopic coherence supports the proposed model of a FQH nematic state.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); Gordon and Betty Moore Foundation

Grant/Contract Number:: SC0006671

OSTI ID:: 1610885

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 3 Vol. 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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