Non equilibrium anisotropic excitons in atomically thin ReS$_2$. (arXiv:1811.03461v1 [cond-mat.mes-hall])

//Non equilibrium anisotropic excitons in atomically thin ReS$_2$. (arXiv:1811.03461v1 [cond-mat.mes-hall])

We present a systematic investigation of the electronic properties of bulk and few layer ReS$_2$ van der Waals crystals using low temperature optical spectroscopy. Weak photoluminescence emission is observed from two non-degenerate band edge excitonic transitions separated by $sim$ 20 meV. The comparable emission intensity of both excitonic transitions is incompatible with a fully thermalized (Boltzmann) distribution of excitons, indicating the hot nature of the emission. While DFT calculations predict bilayer ReS$_2$ to have a direct fundamental band gap, our optical data suggests that the fundamental gap is indirect in all cases.

Published : "arXiv Mesoscale and Nanoscale Physics".

2018-11-09T04:30:35+00:00November 9th, 2018|Categories: Publications|
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