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21 January 2022
  » arxiv » 2009.01421

 Article overview

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
AbstractUnidirectional 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
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