Quantum Control of Current Partition at Trifurcating Topological Channels

ORAL

Abstract

Topological channels can emerge a network along the domain walls that separate AB and BA stacking regions in minimally twisted bilayer graphene, which have been imaged by using scanning tunneling microscope recently. Here, we design a six-terminal graphene device to study how the incoming valley-polarized current will partition at the topological crossing point. We find that the incoming current not only can be partitioned into the two adjacent topological channels, but also goes straight along the incoming topological channel, which together form a trifurcating beam splitter. We provide a further systematic study on how to externally tune the trifurcating current partition by means of manipulating the system size, Fermi-energy, magnetic field, relative masses.

*National Key Research and Development Program (Grant No. 2016YFA0301700)
National Key Research and Development Program (Grant No. 2017YFB0405703)
National Natural Science Foundation of China (Grant No. 11474265)

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Presenters

  • Tao Hou

    • Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China

Authors

  • Tao Hou

    • Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China

  • Yujie Quan

    • Department of Physics, University of Science and Technology of China

  • Yafei Ren

    • Department of Physics, University of Science and Technology of China

  • Jeil Jung

    • University of Seoul
    • Department of Physics, University of Seoul, Seoul 02504, Korea
    • Department of Physics, University of Seoul

  • Wei Ren

    • Department of Physics, Shanghai University
    • Shanghai University
    • Physics Department, Shanghai University

  • Zhenhua Qiao

    • University of Science and Technology of China
    • Department of Physics, University of Science and Technology of China