Flat bands in small angle twisted bilayer WSe<sub>2</sub>
ORAL
Abstract
The discovery of superconductivity in magic angle twisted bilayer graphene has ignited great interest in exploring flat bands in two-dimensional van der Waals heterostructures. We demonstrate for the first time the existence of flat bands in the electronic structure of a 3° twisted bilayer WSe2 sample using low temperature scanning tunneling microscopy and spectroscopy. Using variable height spectroscopy, we observe sharp peaks in the density of states near the valence band edge related to the flat bands. By decay constant measurements, we assign various peaks in the density of states to different locations in the Brillouin zone. By direct spatial mapping of the wavefunctions at the flat band energy, we have found that the flat band is localized in the form of a hexagonal network, which is in excellent agreement with first-principle density functional theory calculations.
*Work at the University of Arizona was supported by the National Science Foundation under grants DMR-1708406 and EECS-1607911 and the Army Research Office under Grant No. W911NF-18-1-0420.
–
Presenters
Zhiming Zhang
Physics Department, University of Arizona
Department of Physics, University of Arizona
Authors
Zhiming Zhang
Physics Department, University of Arizona
Department of Physics, University of Arizona
Yimeng Wang
Department of Electrical and Computer Engineering, The University of Texas at Austin
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
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
Keiji Ueno
Department of Chemistry, Saitama University
Emanuel Tutuc
Department of Electrical and Computer Engineering, The University of Texas at Austin
