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A cascade of phase transitions in an orbitally mixed half-filled Landau level

Falson, Joseph and Tabrea, Daniela and Zhang, Ding and Sodemann, Inti and Kozuka, Yusuke and Tsukazaki, Atsushi and Kawasaki, Masashi and von Klitzing, Klaus and Smet, Jurgen H. (2018) A cascade of phase transitions in an orbitally mixed half-filled Landau level. Science Advances, 4 (9). Art. No. eaat8742. ISSN 2375-2548. PMCID PMC6140610.

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Half-filled Landau levels host an emergent Fermi liquid that displays instability toward pairing, culminating in a gapped even-denominator fractional quantum Hall ground state. While this pairing may be probed by tuning the polarization of carriers in competing orbital and spin degrees of freedom, sufficiently high quality platforms offering such tunability remain few. We explore the ground states at filling factor ν = 5/2 in ZnO-based two-dimensional electron systems through a forced intersection of opposing spin branches of Landau levels taking quantum numbers N = 1 and 0. We reveal a cascade of phases with distinct magnetotransport features including a gapped phase polarized in the N = 1 level and a compressible phase in N = 0, along with an unexpected Fermi liquid, a second gapped, and a strongly anisotropic nematic-like phase at intermediate polarizations when the levels are near degeneracy. The phase diagram is produced by analyzing the proximity of the intersecting levels and highlights the excellent reproducibility and controllability that ZnO offers for exploring exotic fractionalized electronic phases.

Item Type:Article
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URLURL TypeDescription CentralArticle Information Paper
Falson, Joseph0000-0003-3183-9864
Zhang, Ding0000-0002-8334-8349
Kozuka, Yusuke0000-0001-7674-600X
Tsukazaki, Atsushi0000-0003-0251-063X
Kawasaki, Masashi0000-0001-6397-4812
von Klitzing, Klaus0000-0002-1720-7396
Smet, Jurgen H.0000-0002-4719-8873
Additional Information:© 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). Received for publication April 16, 2018. Accepted for publication August 2, 2018. We appreciate discussions with M. Barkeshli, H. Boschker, B. Feldman, Y. Liu, and M. Zudov. We acknowledge the financial support of Japan Science and Technology Agency (JST) Core Research for Evolutional Science and Technology grant number JPMJCR16F1. J.F. acknowledges the Max Planck–University of British Columbia–University of Tokyo Center for Quantum Materials and the Deutsche Forschungsgemeinschaft (FA 1392/2-1). Y.K. acknowledges JST Precursory Research for Embryonic Science and Technology grant number JPMJPR1763. Author contributions: J.F., D.T., and D.Z. gathered the transport data. J.F. grew the samples with assistance from Y.K., A.T., and M.K. J.F. and I.S. wrote the manuscript following discussion and input from all authors. The authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Additional data related to this paper may be requested from the authors.
Funding AgencyGrant Number
Japan Science and Technology AgencyJPMJCR16F1
Deutsche Forschungsgemeinschaft (DFG)FA 1392/2-1
Japan Science and Technology AgencyJPMJPR1763
Issue or Number:9
PubMed Central ID:PMC6140610
Record Number:CaltechAUTHORS:20200402-144732177
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Official Citation:A cascade of phase transitions in an orbitally mixed half-filled Landau level BY JOSEPH FALSON, DANIELA TABREA, DING ZHANG, INTI SODEMANN, YUSUKE KOZUKA, ATSUSHI TSUKAZAKI, MASASHI KAWASAKI, KLAUS VON KLITZING, JURGEN H. SMET Science Advances 14 Sep 2018: Vol. 4, no. 9, eaat8742 DOI: 10.1126/sciadv.aat8742
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102280
Deposited By: George Porter
Deposited On:03 Apr 2020 16:25
Last Modified:03 Apr 2020 16:57

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