Temperature dependence of free carriers and optical phonons in LiInSe2 in the terahertz frequency regime

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2015
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Wang, Shanpeng
Tao, Xutang
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We investigate free carriers dynamics and anharmonic decay of optical phonons in LiInSe2 by using low temperature THz time-domain spectroscopy. The quantitatively determined refractive index and absorption coefficient are significantly influenced by temperature. By fitting the evaluated dielectric functions with a Drude-Lorentz model, the temperature dependencies of the plasmon frequency, scattering rates of free carriers, activation energies of carriers, and frequencies and linewidths of optical phonons are investigated. The contributions of three- and four-phonon processes to the temperature dependent optical phonon frequency and linewidth variations are quantitatively determined.

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ISO 690LIANG, Qijun, Shanpeng WANG, Xutang TAO, Thomas DEKORSY, 2015. Temperature dependence of free carriers and optical phonons in LiInSe2 in the terahertz frequency regime. In: Physical Review B. 2015, 92(14), 144303. ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.92.144303
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@article{Liang2015Tempe-32017,
  year={2015},
  doi={10.1103/PhysRevB.92.144303},
  title={Temperature dependence of free carriers and optical phonons in LiInSe<sub>2</sub> in the terahertz frequency regime},
  number={14},
  volume={92},
  issn={1098-0121},
  journal={Physical Review B},
  author={Liang, Qijun and Wang, Shanpeng and Tao, Xutang and Dekorsy, Thomas},
  note={Article Number: 144303}
}
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