Photocarrier relaxation pathway in two-dimensional semiconducting transition metal dichalcogenides.

@article{Kozawa2014PhotocarrierRP,
  title={Photocarrier relaxation pathway in two-dimensional semiconducting transition metal dichalcogenides.},
  author={Daichi Kozawa and Rajeev Kumar and Alexandra Nascimento Carvalho and Kiran Kumar Amara and Weijie Zhao and Shunfeng Wang and Minglin Toh and Ricardo Ribeiro and A H Castro Neto and Kazunari Matsuda and Goki Eda},
  journal={Nature communications},
  year={2014},
  volume={5},
  pages={4543}
}
Two-dimensional crystals of semiconducting transition metal dichalcogenides absorb a large fraction of incident photons in the visible frequencies despite being atomically thin. It has been suggested that the strong absorption is due to the parallel band or 'band nesting' effect and corresponding divergence in the joint density of states. Here, we use photoluminescence excitation spectroscopy to show that the band nesting in mono- and bilayer MX2 (M=Mo, W and X=S, Se) results in excitation… CONTINUE READING
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