Metal-Insulator Transition and High Temperature Charge Density Waves in monolayer VSe<sub>2</sub>

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.

*This work is published in Nano Letters 18, 5432 (2018). This work was supported by the Korean government (No. NRF-2009-0093818, NRF-2014R1A4A1071686, NRF-2015R1D1A1A01057271, NRF-2017R1C1B2004927, NRF-2015R1C1A1A01051629, No. 2011-0030046, and Grant No. IBS-R009-G1). The ALS is supported by the U.S. DOE under Contract No. DE-AC02- 05CH11231.

–

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