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Additional exitonic features and momentum-dark states in ReS$_{2}$ | | Avijit Dhara
; Devarshi Chakrabarty
; Pritam Das
; Aswini K. Pattanayak
; Shreya Paul
; Shreyashi Mukherjee
; Sajal Dhara
; | | Date: |
3 Sep 2020 | | Abstract: | Unidirectional in-plane structural anisotropy in Rhenium-based
dichalcogenides introduces a new class of 2-D materials, exhibiting anisotropic
optical properties. In this work, we perform temperature dependent,
polarization-resolved photoluminescence and reflectance measurements on
several-layer ReS$_{2}$. We uncover two additional excitonic resonances, which
can be attributed to splitting of spin degenerate states. Strong in-plane
oscillator strength of exciton species X$_{1}$ and X$_{2}$ are accompanied by
weaker counterparts X$_{3}$ and X$_{4}$ with similar polarization orientations.
The in-plane anisotropic dielectric function has been obtained for ReS$_{2}$
which is essential for engineering light matter coupling for polarization
sensitive optoelectronic devices. Furthermore, our temperature dependent study
revealed the existence of low-lying momentum-forbidden dark states causing an
anomalous PL intensity variation at 30 K, which has been elucidated using a
rate equation model involving phonon scattering from these states. Our findings
of the additional excitonic features and the momentum-dark states can shed
light on the true nature of the electronic band structure of ReS$_{2}$. | | Source: | arXiv, 2009.01421 | | Services: | Forum | Review | PDF | Favorites | |
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