Exciton spectrum in two-dimensional transition metal dichalcogenides : the role of Diracness

2017
Authors
Goerbig, Mark Oliver
Journal article
Published
Published in
Journal of Physics : Conference Series ; 864 (2017). - 012033. - ISSN 1742-6588. - eISSN 1742-6596
Abstract
The physics of excitons, electron-hole pairs that are bound together by their mutual Coulomb attraction, can to great extent be understood in the framework of the quantum-mechanical hydrogen model. This model has recently been challenged by spectroscopic measurements on two-dimensional transition-metal dichalchogenides that unveil strong deviations from a hydrogenic spectrum. Here, we show that this deviation is due to the particular relativistic character of electrons in this class of materials. Indeed, their electrons are no longer described in terms of a Schrödinger but a massive Dirac equation that intimately links electrons to holes. Dirac excitons therefore inherit a relativistic quantum spin-1/2 that contributes to the angular momentum and thus the exciton spectrum. Most saliently, the level spacing is strongly reduced as compared to the hydrogen model, in agreement with spectroscopic measurements and ab-initio calculations.
530 Physics
Cite This
ISO 690TRUSHIN, Maxim, Mark Oliver GOERBIG, Wolfgang BELZIG, 2017. Exciton spectrum in two-dimensional transition metal dichalcogenides : the role of Diracness. In: Journal of Physics : Conference Series. 864, 012033. ISSN 1742-6588. eISSN 1742-6596. Available under: doi: 10.1088/1742-6596/864/1/012033
BibTex
@article{Trushin2017-08-15Excit-42919,
year={2017},
doi={10.1088/1742-6596/864/1/012033},
title={Exciton spectrum in two-dimensional transition metal dichalcogenides : the role of Diracness},
volume={864},
issn={1742-6588},
journal={Journal of Physics : Conference Series},
author={Trushin, Maxim and Goerbig, Mark Oliver and Belzig, Wolfgang},
note={Article Number: 012033}
}

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