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:
-
- Aarhus Univ. (Denmark)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- 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 = {Fri Apr 03 00:00:00 EDT 2020},
month = {Fri Apr 03 00:00:00 EDT 2020}
}
Web of Science
Figures / Tables:
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