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Electron energy relaxation under terahertz excitation in (Cd1−xZnx)3As2 Dirac semimetals

Electron energy relaxation under terahertz excitation in (Cd1−xZnx)3As2 Dirac semimetals

Authors :
Alexandra V. Galeeva
Ivan V. Krylov
Konstantin A. Drozdov
Anatoly F. Knjazev
Alexey V. Kochura
Alexander P. Kuzmenko
Vasily S. Zakhvalinskii
Sergey N. Danilov
Ludmila I. Ryabova
Dmitry R. Khokhlov
Source :
Beilstein Journal of Nanotechnology, Vol 8, Iss 1, Pp 167-171 (2017)
Publication Year :
2017
Publisher :
Beilstein-Institut, 2017.

Abstract

We demonstrate that measurements of the photo-electromagnetic effect using terahertz laser radiation provide an argument for the existence of highly conductive surface electron states with a spin texture in Dirac semimetals (Cd1−xZnx)3As2. We performed a study on a range of (Cd1−xZnx)3As2 mixed crystals undergoing a transition from the Dirac semimetal phase with an inverse electron energy spectrum to trivial a semiconductor with a direct spectrum in the crystal bulk by varying the composition x. We show that for the Dirac semimetal phase, the photo-electromagnetic effect amplitude is defined by the number of incident radiation quanta, whereas for the trivial semiconductor phase, it depends on the laser pulse power, irrespective of wavelength. We assume that such behavior is attributed to a strong damping of the interelectron interaction in the Dirac semimetal phase compared to the trivial semiconductor, which may be due to the formation of surface electron states with a spin texture in Dirac semimetals.

Details

Language :
English
ISSN :
21904286
Volume :
8
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Beilstein Journal of Nanotechnology
Publication Type :
Academic Journal
Accession number :
edsdoj.80ae3cc763a44ceda588dd9a9b9d3b1f
Document Type :
article
Full Text :
https://doi.org/10.3762/bjnano.8.17