Drift velocity saturation and large current density in intrinsic three-dimensional Dirac semimetal cadmium arsenide.

Author(s) Kubakaddi, S.S.
Journal J Phys Condens Matter
Date Published 2020 Feb 26
Abstract

Transport of electrons at high electric fields is investigated in intrinsic three-dimensional Dirac semimetal cadmium arsenide, considering the scattering of electrons from acoustic and optical phonons. Screening and hot phonon effect are taken in to account. Expressions for the hot electron mobility μ and power loss P are obtained as a function of electron temperature T_e. The dependence of drift velocity v_d on electric field E and electron density n_e has been studied. Hot phonon effect is found to set in the saturation of v_d at relatively low E and to significantly degrade its magnitude. The drift velocity is found to saturate at a value v_ds ~ 10^7 cm/s and it is weakly dependent on n_e. A large saturation current density ~ 10^6 A/cm^2 is predicted.

DOI 10.1088/1361-648X/ab7a4c
ISSN 1361-648X
Citation Kubakaddi SS. Drift velocity saturation and large current density in intrinsic three-dimensional Dirac semimetal cadmium arsenide. J Phys Condens Matter. 2020.

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