Siday, Thomas and Sandner, Fabian and Brem, Samuel and Zizlsperger, Martin and Perea-Causin, Raul and Schiegl, Felix and Nerreter, Svenja and Plankl, Markus and Merkl, Philipp and Mooshammer, Fabian and Huber, Markus A. and Malic, Ermin and Huber, Rupert (2022) Ultrafast Nanoscopy of High-Density Exciton Phases in WSe2. NANO LETTERS, 22 (6). pp. 2561-2568. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
The density-driven transition of an exciton gas into an electron- hole plasma remains a compelling question in condensed matter physics. In two-dimensional transition metal dichalcogenides, strongly bound excitons can undergo this phase change after transient injection of electron-hole pairs. Unfortunately, unavoidable nanoscale inhomogeneity in these materials has impeded quantitative investigation into this elusive transition. Here, we demonstrate how ultrafast polarization nanoscopy can capture the Mott transition through the density-dependent recombination dynamics of electron-hole pairs within a WSe2 homobilayer. For increasing carrier density, an initial monomolecular recombination of optically dark excitons transitions continuously into a bimolecular recombination of an unbound electron-hole plasma above 7 x 10(12) cm(-2). We resolve how the Mott transition modulates over nanometer length scales, directly evidencing the strong inhomogeneity in stacked monolayers. Our results demonstrate how ultrafast polarization nanoscopy could unveil the interplay of strong electronic correlations and interlayer coupling within a diverse range of stacked and twisted two-dimensional materials.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MONOLAYER; Mott transition; exciton; ultrafast dynamics; near-field microscopy; terahertz; transition metal dichalcogenides |
| 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: | 05 Feb 2024 15:13 |
| Last Modified: | 05 Feb 2024 15:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57263 |
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