Abstract
The electronic structure and dynamics of 2D transition metal dichalcogenide (TMD) monolayers provide important underpinnings both for understanding the many-body physics of electronic quasi-particles and for applications in advanced optoelectronic devices. However, extensive experimental investigations of semiconducting monolayer TMDs have yielded inconsistent results for a key parameter, the quasi-particle band gap (QBG), even for measurements carried out on the same layer and substrate combination. Here, we employ sensitive time- and angle-resolved photoelectron spectroscopy (trARPES) for a high-quality large-area MoS2 monolayer to capture its momentum-resolved equilibrium and excited-state electronic structure in the weak-excitation limit. For monolayer MoS2 on graphite, we obtain QBG values of ≈2.10 eV at 80 K and of ≈2.03 eV at 300 K, results well-corroborated by the scanning tunneling spectroscopy (STS) measurements on the same material.
Original language | English |
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Pages (from-to) | 7363-7370 |
Number of pages | 8 |
Journal | Nano letters |
Volume | 21 |
Issue number | 17 |
DOIs | |
State | Published - 8 Sep 2021 |
Keywords
- MoS
- Transition metal dichalcogenide (TMD)
- XUV-trARPES
- electronic structure
- exciton
- monolayer