Brem, Samuel and Lin, Kai-Qiang and Gillen, Roland and Bauer, Jonas M. and Maultzsch, Janina and Lupton, John M. and Malic, Ermin (2020) Hybridized intervalley moire excitons and flat bands in twisted WSe(2)bilayers. NANOSCALE, 12 (20). pp. 11088-11094. ISSN 2040-3364, 2040-3372
Full text not available from this repository. (Request a copy)Abstract
The large surface-to-volume ratio in atomically thin 2D materials allows to efficiently tune their properties through modifications of their environment. Artificial stacking of two monolayers into a bilayer leads to an overlap of layer-localized wave functions giving rise to a twist angle-dependent hybridization of excitonic states. In this joint theory-experiment study, we demonstrate the impact of interlayer hybridization on bright and momentum-dark excitons in twisted WSe(2)bilayers. In particular, we show that the strong hybridization of electrons at the ? point leads to a drastic redshift of the momentum-dark K-? exciton, accompanied by the emergence of flat moire exciton bands at small twist angles. We directly compare theoretically predicted and experimentally measured optical spectra allowing us to identify photoluminescence signals stemming from phonon-assisted recombination of layer-hybridized dark excitons. Moreover, we predict the emergence of additional spectral features resulting from the moire potential of the twisted bilayer lattice.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRONIC-STRUCTURE; SINGLE-LAYER; INTERLAYER; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Mar 2021 10:02 |
| Last Modified: | 24 Mar 2021 10:02 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44518 |
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