Visualizing and Manipulating Bilayer Graphene Quantum Dot States

ORAL

Abstract

Quantum confinement enables the control of a material's electronic, spin, and optical properties. A common platform to realize quantum confinement is a quantum dot (QD), which can be achieved through various methods such as electrostatic, self-assembly, and etching. Electrostatically defined monolayer and bilayer graphene QDs are unique compared to lateral semiconductor QDs because the quasi particles in the former possess chirality. As a result, upon normal incidence on a potential barrier monolayer graphene (MLG) features a 100% transmission (Klein tunneling) and bilayer graphene (BLG) features a 100% reflection (anti-Klein tunneling). Recently, several scanning tunneling spectroscopy (STS) studies have been performed on exposed electrostatically defined MLG QDs and have revealed chiral bound states with a tunable Berry phase. However, to date, no STS studies have directly probed the quasi-bound states in BLG QDs. Here we present our latest experimental progress on directly probing and manipulating the quasi-bound states in exposed BLG QDs with a scanning tunneling microscope (STM).

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Presenters

  • Zhehao Ge

    Department of Physics, University of California, Santa Cruz, Physics, University of California, Santa Cruz, Physics Dept., University of California: Santa Cruz

Authors

  • Zhehao Ge

    Department of Physics, University of California, Santa Cruz, Physics, University of California, Santa Cruz, Physics Dept., University of California: Santa Cruz

  • Frederic Joucken

    University of California, Santa Cruz, Department of Physics, University of California, Santa Cruz, Physics Dept., University of California: Santa Cruz

  • Eberth A Quezada

    Department of Physics, University of California, Santa Cruz, Physics, University of California, Santa Cruz, Physics Dept., University of California: Santa Cruz

  • Diego Rabelo da Costa

    Physics, Universidade Federal do Ceará, Department of Physics, Federal University of Ceará

  • John Davenport

    Department of Physics, University of California, Santa Cruz, Physics Dept., University of California: Santa Cruz

  • Biran Giraldo

    Department of Electrical and Computer Engineering, University of California, Santa Cruz

  • Nobuhiko Kobayashi

    Department of Electrical and Computer Engineering, University of California, Santa Cruz

  • 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

  • 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

  • Tony Low

    University of Minnesota, Department of Electrical & Computer Engineering, University of Minnesota, Electrical & Computer Engineering, University of Minnesota

  • Jairo Velasco Jr.

    University of California, Santa Cruz, Department of Physics, University of California, Santa Cruz, Physics, University of California, Santa Cruz, Physics Dept., University of California: Santa Cruz