2018年7月28日
Ultrafast Dynamics of Electron-phonon Coupling in Transition-metal Dichalcogenides
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- 記述言語
- 掲載種別
- 機関テクニカルレポート，技術報告書，プレプリント等
Time-domain femtosecond laser spectroscopic measurements of the ultrafast<br />
lattice dynamics in 2H-MoTe2 bulk crystals were carried out to understand the<br />
carrier-phonon interactions that govern electronic transport properties. An<br />
unusually long lifetime coherent A1g phonon mode was observed even in the<br />
presence of very large density of photo-excited carriers at room temperature.<br />
The decay rate was observed to decrease with increasing excitation laser<br />
fluence. Based on the laser fluence dependence including the inducement of<br />
significant phonon softening and a peculiar decrease in phonon decay rate, we<br />
attribute the long lifetime lattice dynamics to weak anharmonic phonon-phonon<br />
coupling and a carrier-density-dependent deformation potential electron-phonon<br />
coupling.
lattice dynamics in 2H-MoTe2 bulk crystals were carried out to understand the<br />
carrier-phonon interactions that govern electronic transport properties. An<br />
unusually long lifetime coherent A1g phonon mode was observed even in the<br />
presence of very large density of photo-excited carriers at room temperature.<br />
The decay rate was observed to decrease with increasing excitation laser<br />
fluence. Based on the laser fluence dependence including the inducement of<br />
significant phonon softening and a peculiar decrease in phonon decay rate, we<br />
attribute the long lifetime lattice dynamics to weak anharmonic phonon-phonon<br />
coupling and a carrier-density-dependent deformation potential electron-phonon<br />
coupling.
- リンク情報
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- arXiv
- http://arxiv.org/abs/arXiv:1807.10879
- Arxiv Url
- http://arxiv.org/abs/1807.10879v1
- Arxiv Url
- http://arxiv.org/pdf/1807.10879v1 本文へのリンクあり
- ID情報
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- arXiv ID : arXiv:1807.10879