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Narrow-band high-lying excitons with negative-mass electrons in monolayer WSe2

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Lin, Kai-Qiang ; Ong, Chin Shen ; Bange, Sebastian ; Faria Junior, Paulo E. ; Peng, Bo ; Ziegler, Jonas D. ; Zipfel, Jonas ; Bäuml, Christian ; Paradiso, Nicola ; Watanabe, Kenji ; Taniguchi, Takashi ; Strunk, Christoph ; Monserrat, Bartomeu ; Fabian, Jaroslav ; Chernikov, Alexey ; Qiu, Diana Y. ; Louie, Steven G. ; Lupton, John M.
License: Creative Commons Attribution 4.0
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Date of publication of this fulltext: 15 Feb 2022 19:38


Monolayer transition-metal dichalcogenides (TMDCs) show a wealth of exciton physics. Here, we report the existence of a new excitonic species, the high-lying exciton (HX), in single-layer WSe2 with an energy of similar to 3.4 eV, almost twice the band-edge A-exciton energy, with a linewidth as narrow as 5.8 meV. The HX is populated through momentum-selective optical excitation in the K-valleys ...


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