Gehlmann, Mathias and Aguilera, Irene and Bihlmayer, Gustav and Nemsak, Slavornir and Nagler, Philipp and Gospodaric, Pika and Zamborlini, Giovanni and Eschbach, Markus and Feyer, Vitally and Kronast, Florian and Mlynczak, Ewa and Korn, Tobias and Plucinski, Lukasz and Schueller, Christian and Bluegel, Stefan and Schneider, Claus M. (2017) Direct Observation of the Band Gap Transition in Atomically Thin ReS2. NANO LETTERS, 17 (9). pp. 5187-5192. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
ReS2 is considered as a promising candidate for novel electronic and sensor applications. The low crystal symmetry of this van der Waals compound leads to a highly anisotropic optical, vibrational, and transport behavior. However, the details of the electronic band structure of this fascinating material are still largely unexplored. We present a momentum-resolved study of the electronic structure of monolayer, bilayer, and bulk ReS2 using k-space photoemission microscopy in combination with first-principles calculations. We demonstrate that the valence electrons in bulk ReS2 are contrary to assumptions in recent literature significantly delocalized across the van der Waals gap. Furthermore, we directly observe the evolution of the valence band dispersion as a function of the number of layers, revealing the transition from an indirect band gap in bulk ReS2 to a direct gap in the bilayer and the monolayer. We also find a significantly increased effective hole mass in single-layer crystals. Our results establish bilayer ReS2 as an advantageous building block for two-dimensional devices and van der Waals heterostructures.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DER-WAALS HETEROSTRUCTURES; FEW-LAYER RES2; MONOLAYER MOS2; DIODES; HETEROJUNCTION; TRANSISTORS; CRYSTALS; MODES; ReS2; band gap transition; photoemission spectroscopy; GW band structure calculations; van der Waals materials |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:15 |
| Last Modified: | 20 Feb 2019 07:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1278 |
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