Control of Giant Orbital Magnetic Moment and Valley Splitting in Bernal Stacked Trilayer Graphene

ORAL

Abstract

The valley degree of freedom in two-dimensional (2D) materials is promising for applications in quantum technologies such as information storage, processing, and reading. In general, however, the valley degree of freedom in 2D materials is difficult to control because valleys are often degenerate or possess different energies that are indistinguishable experimentally. Therefore, an important step toward the realization of valley-based quantum information technology is the capability and control of valley splitting. In this regard, Bernal stacked trilayer graphene (ABA-TLG) is promising because it has two valleys that can be configured to host giant opposite non-zero orbital magnetic moments. In this talk, I will show our recent scanning tunneling spectroscopy (STS) study of ABA-TLG with magnetic field and back gate modulation. By applying an out-of-plane magnetic field we couple to the orbital magnetic moments in ABA-TLG and realize giant valley splitting. Subsequently, by modulating the back gate voltage in our devices we can tune the valley splitting by a factor of 2 at a constant magnetic field.

*We acknowledge supports from the NSF CAREER award under award number DMR-1753367, the Army Research Office under contract W911NF-17-1-0473, and the EU Graphene Flagship Project.

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Presenters

  • Zhehao Ge

    • Physics Department, University of California, Santa Cruz
    • Department of Physics, University of California, Santa Cruz
    • University of California, Santa Cruz

Authors

  • Zhehao Ge

    • Physics Department, University of California, Santa Cruz
    • Department of Physics, University of California, Santa Cruz
    • University of California, Santa Cruz

  • Sergey Slizovskiy

    • School of Physics and Astronomy, University of Manchester
    • Manchester University
    • Department of Physics and Astronomy, University of Manchester

  • Frederic Joucken

    • Department of Physics, University of California, Santa Cruz
    • Physics, Arizona State University

  • Eberth A Quezada

    • Department of Physics, University of California, Santa Cruz
    • University of California, Santa Cruz

  • Takashi Taniguchi

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • International Center for Materials Nanoarchitectonics, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • 8International Center for Materials Nanoarchitectonics
    • NIMS Tsukuba
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • International Center for Material Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Cheng Kung University
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, International Center for Materials Nanoarchitectonics
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Kenji Watanabe

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • Research Center for Functional Materials, NIMS
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Materials, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials nanoarchtectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, Ibaraki, Japan
    • National Institute for Materials Science, Research Center for Functional Materials
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Vladimir Falko

    • National Graphene Institute, Henry Royce Institute for Advanced Materials, Department of Physics and Astronomy, University of Manchester
    • National Graphene Institute
    • Univ of Manchester
    • School of Physics and Astronomy, University of Manchester
    • Manchester University
    • Department of Physics and Astronomy, University of Manchester
    • National Graphene Institute, University of Manchester
    • University of Manchester
    • Physics and Astronomy, National Graphene Institute, the University of Manchester, UK

  • Jairo Velasco Jr.

    • Physics Department, University of California, Santa Cruz
    • Department of Physics, University of California, Santa Cruz
    • University of California, Santa Cruz