Journal
SCIENCE ADVANCES
Volume 6, Issue 14, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay6104
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Funding
- VILLUM FONDEN [15375]
- Danish Council for Independent Research, Natural Sciences under the Sapere Aude program [DFF-6108-00409]
- Aarhus University Research Foundation
- German Academic Exchange Service (DAAD)
- Carnegie Mellon University
- Center for Emergent Materials: an NSF MRSEC [DMR-1420451]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Nanoscience Institute
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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 similar to 1 mu m, 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.
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