Optical measurements of twisted bilayer transition metal dichalcogenides

ORAL

Abstract

Two-dimensional Van der Waals material has become an exciting field. One of the reason is that
this system provides multiple degrees of freedom, including stacking order, interlayer spacing
and interlayer twist angle, to engineer the material band structure. Manipulation of these degrees of
freedom has led to observation of several emergent phenomena, including the fractal quantum
Hall effect, tunable Mott insulators, and unconventional superconductivity. In particular,
interlayer interaction in van der Waals heterostructures at different twist angle could induce
many exotic phenomena. How the interlayer interaction affects the electronic structure of a
material is a fundamental question. In this study, we report optical measurements of twisted bilayer
transition-metal dichalcogenides (TMDs) and demonstrate how its band structure vary with twist
angle. These results broaden the application range of van der Waals heterostructure for future
optoelectronic devices.

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Presenters

  • Augusto Ghiotto

    Columbia University, Physics, Columbia University

Authors

  • Augusto Ghiotto

    Columbia University, Physics, Columbia University

  • Lei Wang

    Cornell University, Physics, Cornell University, Columbia University

  • En-Min Shih

    Columbia University, Physics, Columbia University

  • Daniel A Rhodes

    Columbia University, Physics, Columbia University, National High Magnetic Field Laboratory, Tallahassee, FL-32310, USA., Columbia Nano Initiative, Columbia University, Department of Mechanical Engineering, Columbia University, New York, NY 10027 USA, Mechanical Engineering, Columbia University, Columbia Univ

  • Cheng Tan

    Columbia University, Physics, Columbia University

  • Abhay Pasupathy

    Columbia University, Physics, Columbia University, Department of Physics, Columbia University in the City of New York, Physics Department, Columbia University, Department of Physics, Columbia University

  • James Hone

    Columbia University, Mechanics, Columbia University, Department of Mechanical Engineering, Columbia University in the City of New York, Department of Mechanical Engineering, Columbia University, Department of Mechanical Engineering, Columbia University, New York, NY 10027 USA, Mechanical Engineering, Columbia University

  • Cory R Dean

    Columbia University, Department of Physics, Columbia University in the City of New York, Department of Physics, Columbia University, Physics, Columbia University, Physics Department, Columbia University