Effect of correlation on nearly flat bands in twisted bilayer graphene

ORAL

Abstract

Recently, correlated insulating phases were observed experimentally in twisted bilayer graphene (TBG) at different doping concentrations. To study possible mechanisms for insulating phases, we investigate electronic and magnetic properties in TBG by performing dynamical mean-field theory calculations based on a minimal tight-binding Hamiltonian. We study variation in the spectral function of the nearly flat bands for a range of local interaction parameters, electron filling, and temperature. We compare our results with experimental reports and discuss the possibility of Mott insulating phase in this system.

*This work was supported by NRF of Korea (Grant No. 2011-0018306), KISTI supercomputing center (Project No. KSC-2018-CRE-0097), and the Graduate School of Yonsei University Research Scholarship Grants in 2018.

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Presenters

  • Mancheon Han

    • Department of Physics, Yonsei University, Seoul 03722, Korea

Authors

  • Mancheon Han

    • Department of Physics, Yonsei University, Seoul 03722, Korea

  • Young Woo Choi

    • Department of Physics, Yonsei University, Seoul 03722, Korea
    • Department of Physics, Yonsei University, Seoul, 03722, Korea
    • Institute of Physics and Applied Physics, Yonsei University

  • Hyoung Joon Choi

    • Department of Physics, Yonsei University, Seoul 03722, Korea
    • Department of Physics, Yonsei University, Seoul, 03722, Korea
    • Institute of Physics and Applied Physics, Yonsei University