Quantum Hall Interferometry in Graphene

ORAL

Abstract

Electrons in two dimensions can exhibit unique correlated phenomena such as the fractional quantum Hall effect under strong magnetic fields, in which excitations of composite fermions are fractionally charged. These excitations are predicted to be neither fermionic nor bosonic, but rather should exhibit anyonic exchange statistics in which the wave function acquires a complex phase upon exchange of two identical quasiparticles. However, so far there has been no direct confirmation of these anyonic exchange statistics due to numerous challenges performing the necessary braiding operations in high-mobility 2DEGs. Here, we develop Mach-Zehnder and Fabry-Pérot interferometers in ultra-high quality graphene devices operated in the fractional quantum Hall regime in order to test these predictions. Our efforts to achieve this utilize a variety of device geometries, primarily focused on the use of pn junctions or electrostatically-defined quantum point contacts in graphene.

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Presenters

  • Matthew Yankowitz

    • Columbia Univ
    • Columbia University

Authors

  • Matthew Yankowitz

    • Columbia Univ
    • Columbia University

  • Yihang Zeng

    • physics, columbia university in the city of new york
    • Columbia University

  • Shaowen Chen

    • Columbia University
    • Columbia Univ

  • Jia Li

    • Columbia Univ
    • Columbia University
    • physics, columbia university in the city of new york
    • Department of Physics, Columbia University

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • Advanced materials laboratory, National institute for Materials Science
    • NIMS-Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • NIMS-Japan

  • Cory Dean

    • Physics, Columbia University
    • Columbia University
    • Columbia Univ
    • Physics, Columbia Univ
    • physics, columbia university in the city of new york
    • Department of Physics, Columbia University