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Quasiparticle Tunneling across an Exciton Condensate

Zhang, Ding and Falson, Joseph and Schmult, Stefan and Dietsche, Werner and Smet, Jurgen H. (2020) Quasiparticle Tunneling across an Exciton Condensate. Physical Review Letters, 124 (24). Art. No. 246801. ISSN 0031-9007.

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The bulk properties of the bilayer quantum Hall state at total filling factor one have been intensively studied in experiment. Correlation induced phenomena such as Josephson-like tunneling and zero Hall resistance have been reported. In contrast, the edge of this bilayer state remains largely unexplored. Here, we address this edge physics by realizing quasiparticle tunneling across a quantum point contact. The tunneling manifests itself as a zero bias peak that grows with decreasing temperature. Its shape agrees quantitatively with the formula for weak quasiparticle tunneling frequently deployed in the fractional quantum Hall regime in single layer systems, consistent with theory. Interestingly, we extract a fractional charge of only a few percent of the free electron charge, which may be a signature of the theoretically predicted leakage between the chiral edge and the bulk mediated by gapless excitations.

Item Type:Article
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URLURL TypeDescription
Zhang, Ding0000-0002-8334-8349
Falson, Joseph0000-0003-3183-9864
Smet, Jurgen H.0000-0002-4719-8873
Additional Information:© 2020 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society. Received 7 August 2019; revised manuscript received 2 January 2020; accepted 3 June 2020; published 19 June 2020. We thank Klaus von Klitzing, Hailong Fu, Pengjie Wang, Haiwen Liu, Xincheng Xie, and Timo Hyart for fruitful discussions. We thank Marion Hagel for technical assistance. Self-consistent simulations of the quantum point contact were carried out with the nextnano software package. This study was financially supported by the National Natural Science Foundation of China (Grants No. 11922409, No. 11790311, and No. 11604176) and the German Ministry of Education and Research (BMBF Grant No. 01BM900).
Funding AgencyGrant Number
National Natural Science Foundation of China11922409
National Natural Science Foundation of China11790311
National Natural Science Foundation of China11604176
Bundesministerium für Bildung und Forschung (BMBF)01BM900
Max Planck SocietyUNSPECIFIED
Issue or Number:24
Record Number:CaltechAUTHORS:20200710-122520543
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104328
Deposited By: Tony Diaz
Deposited On:10 Jul 2020 22:35
Last Modified:10 Jul 2020 22:35

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