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      Theoretical and Experimental Study on the Permittivity of CdTe in the Terahertz Band

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          Abstract

          The phonon dispersion spectrum, eigenvector, and lattice vibration frequency of cadmium telluride with a zinc blende structure have been investigated using the density functional theory, and the permittivity of cadmium telluride crystal is numerically calculated. The permittivity of the crystal is measured using the terahertz time-domain spectroscopy system. The experimental results are consistent with the theoretical calculations on the modified local density approximation, the general gradient approximation, and the modified general gradient approximation. Finally, the differences among the three approximate exchange correlation potentials indicate that in the terahertz region, the permittivity of cadmium telluride is dominantly contributed by the coupling between electron and phonon; however, the phonon frequencies of transverse wave and longitudinal wave were sensitive to electron density distribution.

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          Author and article information

          Journal
          Journal of Radars
          Chinese Academy of Sciences
          01 February 2018
          : 7
          : 1
          : 67-74
          Affiliations
          [1 ] (Science and Technology on Electromagnetic Scattering Laboratory, Beijing 100854, China)
          Article
          02a45e06a25c4e6495cb07e58ac6328d
          10.12000/JR17096

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

          Categories
          Technology (General)
          T1-995

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