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Title: Direct observation of minibands in a twisted graphene/WS2 bilayer

Abstract

Stacking two-dimensional (2D) van der Waals materials with different interlayer atomic registry in a heterobilayer causes the formation of a long-range periodic superlattice that may bestow the heterostructure with properties such as new quantum fractal states or superconductivity. Recent optical measurements of transition metal dichalcogenide (TMD) heterobilayers have revealed the presence of hybridized interlayer electron-hole pair excitations at energies defined by the superlattice potential. The corresponding quasiparticle band structures, so-called minibands, have remained elusive, and no such features have been reported for heterobilayers composed of a TMD and another type of 2D material. We introduce a new x-ray capillary technology for performing microfocused angle-resolved photoemission spectroscopy with a spatial resolution of ~1 μm, and directly observe minibands at certain twist angles in mini Brillouin zones (mBZs). We discuss their origin in terms of initial and final state effects by analyzing their dispersion in distinct mBZs.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Aarhus Univ. (Denmark)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  4. Naval Research Lab. (NRL), Washington, DC (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1631650
Grant/Contract Number:  
AC02-05CH11231; 15375; DFF-6108-00409; DMR-1420451
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 14; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ulstrup, Søren, Koch, Roland J., Singh, Simranjeet, McCreary, Kathleen M., Jonker, Berend T., Robinson, Jeremy T., Jozwiak, Chris, Rotenberg, Eli, Bostwick, Aaron, Katoch, Jyoti, and Miwa, Jill A. Direct observation of minibands in a twisted graphene/WS2 bilayer. United States: N. p., 2020. Web. doi:10.1126/sciadv.aay6104.
Ulstrup, Søren, Koch, Roland J., Singh, Simranjeet, McCreary, Kathleen M., Jonker, Berend T., Robinson, Jeremy T., Jozwiak, Chris, Rotenberg, Eli, Bostwick, Aaron, Katoch, Jyoti, & Miwa, Jill A. Direct observation of minibands in a twisted graphene/WS2 bilayer. United States. https://doi.org/10.1126/sciadv.aay6104
Ulstrup, Søren, Koch, Roland J., Singh, Simranjeet, McCreary, Kathleen M., Jonker, Berend T., Robinson, Jeremy T., Jozwiak, Chris, Rotenberg, Eli, Bostwick, Aaron, Katoch, Jyoti, and Miwa, Jill A. Fri . "Direct observation of minibands in a twisted graphene/WS2 bilayer". United States. https://doi.org/10.1126/sciadv.aay6104. https://www.osti.gov/servlets/purl/1631650.
@article{osti_1631650,
title = {Direct observation of minibands in a twisted graphene/WS2 bilayer},
author = {Ulstrup, Søren and Koch, Roland J. and Singh, Simranjeet and McCreary, Kathleen M. and Jonker, Berend T. and Robinson, Jeremy T. and Jozwiak, Chris and Rotenberg, Eli and Bostwick, Aaron and Katoch, Jyoti and Miwa, Jill A.},
abstractNote = {Stacking two-dimensional (2D) van der Waals materials with different interlayer atomic registry in a heterobilayer causes the formation of a long-range periodic superlattice that may bestow the heterostructure with properties such as new quantum fractal states or superconductivity. Recent optical measurements of transition metal dichalcogenide (TMD) heterobilayers have revealed the presence of hybridized interlayer electron-hole pair excitations at energies defined by the superlattice potential. The corresponding quasiparticle band structures, so-called minibands, have remained elusive, and no such features have been reported for heterobilayers composed of a TMD and another type of 2D material. We introduce a new x-ray capillary technology for performing microfocused angle-resolved photoemission spectroscopy with a spatial resolution of ~1 μm, and directly observe minibands at certain twist angles in mini Brillouin zones (mBZs). We discuss their origin in terms of initial and final state effects by analyzing their dispersion in distinct mBZs.},
doi = {10.1126/sciadv.aay6104},
journal = {Science Advances},
number = 14,
volume = 6,
place = {United States},
year = {2020},
month = {4}
}

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Figures / Tables:

Fig. 1 Fig. 1: Elemental mapping of heterobilayer interfaces. (A) Model of sample and photoemission setup with a microfocused beam achieved using an x-ray capillary. Differently rotated graphene domains are separated by white lines and annotated with twist angles θ1 and θ2. (B) Optical microscope image of the sample. Two hBN flakesmore » are shown via arrows. (C) Stack of (x, y)-photoemission intensity maps corresponding to the given binding energies and core level peaks collected at a photon energy of 350 eV. The hBN flakes are also visible in these maps. The arrow on the C 1s map points to a hole in the graphene flake. (D to G) Core level peaks obtained from the spots on the map in (C) labeled by corresponding symbols. The vertical dashed lines mark the binding energies used for composing the maps in (C).« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.