Theory of edge-state optical absorption in two-dimensional transition metal dichalcogenide flakes

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2016
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Kelleher, Edmund J. R.
Hasan, Tawfique
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We develop an analytical model to describe sub-bandgap optical absorption in two-dimensional semiconducting transition metal dichalcogenide (s-TMD) nanoflakes. The material system represents an array of few-layer molybdenum disulfide crystals, randomly orientated in a polymer matrix. We propose that optical absorption involves direct transitions between electronic edge-states and bulk-bands, depends strongly on the carrier population, and is saturable with sufficient fluence. For excitation energies above half the bandgap, the excess energy is absorbed by the edge-state electrons, elevating their effective temperature. Our analytical expressions for the linear and nonlinear absorption could prove useful tools in the design of practical photonic devices based on s-TMDs.

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ISO 690TRUSHIN, Maxim, Edmund J. R. KELLEHER, Tawfique HASAN, 2016. Theory of edge-state optical absorption in two-dimensional transition metal dichalcogenide flakes. In: Physical Review B. 2016, 94(15), 155301. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.94.155301
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@article{Trushin2016Theor-37498,
  year={2016},
  doi={10.1103/PhysRevB.94.155301},
  title={Theory of edge-state optical absorption in two-dimensional transition metal dichalcogenide flakes},
  number={15},
  volume={94},
  issn={2469-9950},
  journal={Physical Review B},
  author={Trushin, Maxim and Kelleher, Edmund J. R. and Hasan, Tawfique},
  note={10 pages, 4 figures, typos fixed as published Article Number: 155301}
}
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10 pages, 4 figures, typos fixed as published
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