Steinleitner, Philipp and Merkl, Philipp and Graft, Alexander and Nagler, Philipp and Watanabe, Kenji and Taniguchi, Takashi and Zipfel, Jonas and Schueller, Christian and Korn, Tobias and Chernikov, Alexey and Brem, Samuel and Selig, Malte and Berghauser, Gunnar and Malic, Ermin and Huber, Rupert (2018) Dielectric Engineering of Electronic Correlations in a van der Waals Heterostructure. NANO LETTERS, 18 (2). pp. 1402-1409. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
Heterostructures of van der Waals bonded layered materials offer unique means to tailor dielectric screening with atomic-layer precision, opening a fertile field of fundamental research. The optical analyses used so far have relied on interband spectroscopy. Here we demonstrate how a capping layer of hexagonal boron nitride (hBN) renormalizes the internal structure of excitons in a WSe2 monolayer using intraband transitions. Ultrabroadband terahertz probes sensitively map out the full complex-valued mid-infrared conductivity of the heterostructure after optical injection of is A excitons. This approach allows us to trace the energies and line widths of the atom-like 1s-2p transition of optically bright and dark excitons as well as the densities of these quasiparticles. The excitonic resonance red shifts and narrows in the WSe2/hBN heterostructure compared to the bare monolayer. Furthermore, the ultrafast temporal evolution of the mid-infrared response function evidences the formation of optically dark excitons from an initial bright population. Our results provide key insight into the effect of nonlocal screening on electron hole correlations and open new possibilities of dielectric engineering of van der Waals heterostructures.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | METAL DICHALCOGENIDE HETEROSTRUCTURES; LIGHT-EMITTING-DIODES; P-N-JUNCTIONS; MONOLAYER WSE2; 2-DIMENSIONAL MATERIALS; SEMICONDUCTOR; SPECTROSCOPY; EXCITONS; MOS2/WS2; LAYER; Dichalcogenides; atomically thin 2D crystals; van der Waals heterostructures; dielectric engineering; dark excitons |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 20 Mar 2020 11:04 |
| Last Modified: | 20 Mar 2020 11:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/15078 |
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