Unveiling anisotropic exciton splitting and momentum-dark states in ReS<sub>2</sub>

ReS₂ has a distorted 1T crystal structure, exhibiting non-equilibrium excitonic properties in electrically decoupled van der Waals layers. Our study finds four excitonic emissions which are highly polarized with dipole moments oriented along different directions with respect to the crystal axis. Dipole orientations of two newly discovered excitons X₃ and X₄ are aligned along two strong previously known excitons X₁ and X₂ respectively. In addition, we observe an anomalous variation in the photoluminescence intensity near 30K which is the signature of momentum-forbidden dark states below the excitonic resonances, as indicated by our rate equation model. Our work shed light on the quasi-direct nature of the electronic band structure for ReS₂ multilayer system.

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Bulletin of the American Physical Society

APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session R57: 2D Semiconductors: Spectroscopy

Abstract: R57.00011 : Unveiling anisotropic exciton splitting and momentum-dark states in ReS2

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Abstract: R57.00011 : Unveiling anisotropic exciton splitting and momentum-dark states in ReS₂