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Mach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene

We realize an electronic Mach-Zehnder interferometer with quantum Hall edge channels along a pn junction in graphene. Confined to a two-dimensional plane, electrons in a strong magnetic field travel along the edge in one-dimensional quantum Hall channels that are protected against backscattering. Th... Full description

Journal Title: Science Advances 2017, Vol.3(8)
Main Author: Wei, Di S
Other Authors: Van Der Sar, Toeno , Sanchez-Yamagishi, Javier D , Watanabe, Kenji , Taniguchi, Takashi , Jarillo-Herrero, Pablo , Halperin, Bertrand I , Yacoby, Amir
Format: Electronic Article Electronic Article
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ID: E-ISSN: 2375-2548 ; DOI: 10.1126/sciadv.1700600 ; PMCID: 5562424 ; PMID: 28835920
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title: Mach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene
format: Article
creator:
  • Wei, Di S
  • Van Der Sar, Toeno
  • Sanchez-Yamagishi, Javier D
  • Watanabe, Kenji
  • Taniguchi, Takashi
  • Jarillo-Herrero, Pablo
  • Halperin, Bertrand I
  • Yacoby, Amir
subjects:
  • Research Article
  • Research Articles
  • Sciadv R-Articles
  • Physical Sciences
  • Quantum Physics
ispartof: Science Advances, 2017, Vol.3(8)
description: We realize an electronic Mach-Zehnder interferometer with quantum Hall edge channels along a pn junction in graphene. Confined to a two-dimensional plane, electrons in a strong magnetic field travel along the edge in one-dimensional quantum Hall channels that are protected against backscattering. These channels can be used as solid-state analogs of monochromatic beams of light, providing a unique platform for studying electron interference. Electron interferometry is regarded as one of the most promising routes for studying fractional and non-Abelian statistics and quantum entanglement via two-particle interference. However, creating an edge-channel interferometer in which electron-electron interactions play an important role requires a clean system and long phase coherence lengths. We realize electronic Mach-Zehnder interferometers with record visibilities of up to 98% using spin- and valley-polarized edge channels that copropagate along a pn junction in graphene. We find that interchannel scattering between same-spin edge channels along the physical graphene edge can be used to form beamsplitters, whereas the absence of interchannel scattering along gate-defined interfaces can be used to form isolated interferometer arms. Surprisingly, our interferometer is robust to dephasing effects at energies an order of magnitude larger than those observed in pioneering experiments on GaAs/AlGaAs quantum wells. Our results shed light on the nature of edge-channel equilibration and open up new possibilities for studying exotic electron statistics and quantum phenomena.
language:
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identifier: E-ISSN: 2375-2548 ; DOI: 10.1126/sciadv.1700600 ; PMCID: 5562424 ; PMID: 28835920
fulltext: fulltext
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  • 2375-2548
  • 23752548
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titleMach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene
creatorWei, Di S ; Van Der Sar, Toeno ; Sanchez-Yamagishi, Javier D ; Watanabe, Kenji ; Taniguchi, Takashi ; Jarillo-Herrero, Pablo ; Halperin, Bertrand I ; Yacoby, Amir
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subjectResearch Article ; Research Articles ; Sciadv R-Articles ; Physical Sciences ; Quantum Physics
descriptionWe realize an electronic Mach-Zehnder interferometer with quantum Hall edge channels along a pn junction in graphene. Confined to a two-dimensional plane, electrons in a strong magnetic field travel along the edge in one-dimensional quantum Hall channels that are protected against backscattering. These channels can be used as solid-state analogs of monochromatic beams of light, providing a unique platform for studying electron interference. Electron interferometry is regarded as one of the most promising routes for studying fractional and non-Abelian statistics and quantum entanglement via two-particle interference. However, creating an edge-channel interferometer in which electron-electron interactions play an important role requires a clean system and long phase coherence lengths. We realize electronic Mach-Zehnder interferometers with record visibilities of up to 98% using spin- and valley-polarized edge channels that copropagate along a pn junction in graphene. We find that interchannel scattering between same-spin edge channels along the physical graphene edge can be used to form beamsplitters, whereas the absence of interchannel scattering along gate-defined interfaces can be used to form isolated interferometer arms. Surprisingly, our interferometer is robust to dephasing effects at energies an order of magnitude larger than those observed in pioneering experiments on GaAs/AlGaAs quantum wells. Our results shed light on the nature of edge-channel equilibration and open up new possibilities for studying exotic electron statistics and quantum phenomena.
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abstractWe realize an electronic Mach-Zehnder interferometer with quantum Hall edge channels along a pn junction in graphene. Confined to a two-dimensional plane, electrons in a strong magnetic field travel along the edge in one-dimensional quantum Hall channels that are protected against backscattering. These channels can be used as solid-state analogs of monochromatic beams of light, providing a unique platform for studying electron interference. Electron interferometry is regarded as one of the most promising routes for studying fractional and non-Abelian statistics and quantum entanglement via two-particle interference. However, creating an edge-channel interferometer in which electron-electron interactions play an important role requires a clean system and long phase coherence lengths. We realize electronic Mach-Zehnder interferometers with record visibilities of up to 98% using spin- and valley-polarized edge channels that copropagate along a pn junction in graphene. We find that interchannel scattering between same-spin edge channels along the physical graphene edge can be used to form beamsplitters, whereas the absence of interchannel scattering along gate-defined interfaces can be used to form isolated interferometer arms. Surprisingly, our interferometer is robust to dephasing effects at energies an order of magnitude larger than those observed in pioneering experiments on GaAs/AlGaAs quantum wells. Our results shed light on the nature of edge-channel equilibration and open up new possibilities for studying exotic electron statistics and quantum phenomena.
pubAmerican Association for the Advancement of Science
doi10.1126/sciadv.1700600
pmid28835920
orcidid0000000261974808
pagese1700600
oafree_for_read
date2017-08-18