The equilibration dynamics of spin-polarized quantum Hall edges at graphene p-n junction

ORAL

Abstract

The Understanding of equilibration dynamics of quantum Hall (QH) edges is essential to realize an electron interferometer, which has the potential to exhibit fractional statistics and quantum entanglement. Recently, graphene pn junction with spin-valley polarized QH edges showed an ideal platform for an electron interferometer. However, the interplay of different scattering mechanisms in equilibration of polarized QH edges at the graphene pn junction remain elusive. In this report, we have carried out the conductance together with shot noise measurements for symmetry broken QH edges co-propagating along a pn junction. The pn junction was realized in a dual
graphite gated hexagonal boron nitride (hBN) encapsulated graphene device. Earlier studies with unpolarized QH edges showed incoherent processes as the dominant scattering mechanism for mode mixing. However, Our results reveal that the mode mixing dynamics of the polarized QH edges are much more intricate depending on the spin sequence of QH edges. A complete crossover from incoherent to fully coherent scattering regime was observed by tuning the number of participating polarized QH edges at the pn junction, which will pave the way to design the electron quantum optics experiments based on polarized QH edges of graphene.

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Presenters

  • Arup Kumar Paul

    • Indian Institute of Science - Dept of Physics
    • Department of physics, Indian Institute of Science, Bangalore 560012, India

Authors

  • Arup Kumar Paul

    • Indian Institute of Science - Dept of Physics
    • Department of physics, Indian Institute of Science, Bangalore 560012, India

  • MANAS SAHU

    • Indian Institute of Science - Dept of Physics
    • Department of Physics, Indian Institute of Science
    • Department of physics, Indian Institute of Science, Bangalore 560012, India

  • Chandan Kumar

    • Indian Institute of Science - Dept of Physics
    • Department of Condensed matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel

  • Kenji Watanabe

    • National Institute for Materials Science, Japan
    • National Institute for Material Science
    • National Institute for Materials Science
    • National Institute for Materials Science, Tsukuba
    • Research Center for Functional Materials, NIMS
    • nims
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • NIMS
    • National Institute for Material Science - Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.
    • National Institute for Materials Science (NIMS)
    • National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Materials Science
    • National Institute for Materials Science, University of Tsukuba
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institute for Material Science, Japan
    • National Institue for Material Science, Tsukuba
    • Advanced Materials Laboratory, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • Advanced Matrials Lab, NIMS
    • National Institute for Material Science, Tsukuba, Japan
    • National institute for materials science
    • NIMS-Tsukuba
    • NIMS, Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • NIRM
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science (Japan)
    • Physics, NIMS
    • National Institute of Materials Science, Japan
    • National Institute of Materials Science (NIMS)
    • National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • NIMS - Tsukuba

  • Takashi Taniguchi

    • National Institute for Materials Science, Japan
    • National Institute for Material Science
    • National Institute for Materials Science
    • National Institute for Materials Science, Tsukuba
    • Research Center for Functional Materials, NIMS
    • nims
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • NIMS
    • National Institute for Material Science - Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.
    • National Institute for Materials Science (NIMS)
    • National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Materials Science
    • National Institute for Materials Science, University of Tsukuba
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institue for Material Science, Tsukuba
    • Advanced Materials Laboratory, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • Advanced Matrials Lab, NIMS
    • National Institute for Material Science, Tsukuba, Japan
    • National institute for materials science
    • NIMS-Tsukuba
    • NIMS, Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Advanced Materials Laboratory, National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan
    • National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science (Japan)
    • Physics, NIMS
    • National Institute of Materials Science, Japan
    • National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • NIMS - Tsukuba

  • Anindya Das

    • Indian Institute of Science - Dept of Physics
    • Physics, Indian Institute of Science, Bangalore
    • Department of Physics, Indian Institute of Science
    • Department of physics, Indian Institute of Science, Bangalore 560012, India