Metal-Insulator Transition and High Temperature Charge Density Waves in monolayer VSe2

ORAL

Abstract

Although emergent phenomena driven by electronic reconstructions in oxide heterostructures have been intensively discussed, such interface-driven phenomena in shaping the electronic properties has not been well established in van der Waals heterointerfaces. By diminishing the material thickness and forming a heterointerface, we observed two types of charge-ordering transitions in monolayer VSe2 on graphene substrates. Comprehensive combination of ARPES, STM, and renormalization group analysis enable us to reveal the low-dimensionality and the heterointerface play important roles in enhancing charge density wave temperature to 350 K contrasted to the 105 K in bulk VSe2 and in driving the unexpected metal-insulator transition at 135 K in the family of monolayered transition metal dichalcogenides. We will discuss implications of our observations in comparison with the similar results reported by two other groups.

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Presenters

  • Young Jun Chang

    University of Seoul, Physics, University of Seoul, Korea

Authors

  • Duvjir Ganbat

    Physics, Ulsan University, Korea

  • Byoung Ki Choi

    Physics, University of Seoul, Korea

  • Iksu Jang

    Physics, POSTECH, Korea

  • Soren Ulstrup

    Department of Physics and Astronomy, Aarhus University, Physics and Astronomy, Aarhus University, Denmark

  • Soonmin Kang

    Center for Correlated Electron Systems, Institute for Basic Science (IBS), Korea

  • Ly Trinh

    Department of Physics,BRL, and EHSRC, University of Ulsan, Ulsan 44610, Korea (the Republic of), Physics, Ulsan University, Korea

  • Sanghwa Kim

    Department of Physics,BRL, and EHSRC, University of Ulsan, Ulsan 44610, Korea (the Republic of), Physics, Ulsan University, Korea

  • Young Hwan Choi

    Physics, University of Seoul, Korea

  • Chris Jozwiak

    Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA, Advanced Light Source, Lawrence Berkeley National Laboratory, ALS, Lawrence National Berkeley Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Berkeley, USA, Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Aaron Bostwick

    Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA, Advanced Light Source, Lawrence Berkeley National Laboratory, ALS, Lawrence National Berkeley Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Eli Rotenberg

    Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA, Advanced Light Source, Lawrence Berkeley National Laboratory, ALS, Lawrence National Berkeley Laboratory, Advanced Light Source, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA, Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Je-Guen Park

    Department of Physics and Astronomy, Seoul National University, Center for Correlated Electron Systems, Institute for Basic Science & Seoul National Univeristy, 2 Center for Correlated Electron Systems, institute for Basic Science; and 3 Department of Physics and Astronomy ,Seoul National University, Seoul, South Korea, Department of Physics and Astronomy, Seoul National University (SNU), Seoul National University, Department of Physics & Astronomy, Seoul National University, Seoul, Korea, Center for Correlated Electron Systems, Institute for Basic Science (IBS), Korea

  • Raman Sankar

    Center for Condensed Matter Sciences, National Taiwan University, Center for Condensed Matter Science, National Taiwan University, Center of Condensed Matter Sciences, National Taiwan University, Institute of Physics, Academia Sinica, National Taiwan University, Physics, Academia Sinica, Taiwan

  • Ki-Seok Kim

    Physics, POSTECH, Korea

  • Jungdae Kim

    University of Texas at Austin, Department of Physics,BRL, and EHSRC, University of Ulsan, Ulsan 44610, Korea (the Republic of), Physics, Ulsan University, Korea

  • Young Jun Chang

    University of Seoul, Physics, University of Seoul, Korea