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Effect of intense laser irradiation on the lattice stability of InSb

Published online by Cambridge University Press:  02 December 2011

M.M. Wang ,
T. Gao ,
Y. Yu  and
X.W. Zeng
M.M. Wang
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P.R. China
T. Gao*
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P.R. China
Y. Yu
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P.R. China
X.W. Zeng
Affiliation:
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong 510640, P.R. China
*
ae-mail: [email protected]
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Abstract

We have performed an ab initio study of electronic and dynamical properties of the zinc-blende InSb at different electronic temperatures. The calculations have been carried out within the density-functional theory and linear-response formalism using norm-conserving pseudopotentials and a plane-wave basis. The calculated direct band gap is seen to be 0.1 eV, which is underestimated with the experimental value of 0.18 eV. As the electronic temperature increases, the results indicate that the InSb undergoes a melting transition to a metallic state. The transverse acoustic modes of the InSb are found to be negative in the most part of the Brillouin zone (BZ) which leads to lattice dynamical unstability at electronic temperature of 0.75 eV as indicated by imaginary phonon frequencies. Moreover, for optical modes, there exists a LO-TO splitting at the zone-center (Γ point) when Te = 0 eV and the frequencies are LO = 190.5 cm−1, TO = 182.4 cm−1, respectively; however, the LO-TO splitting will disappear when Te > 0 eV. The calculated values are in reasonable agreement with available experimental and theoretical data.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 57 , Issue 1 , January 2012 , 10104
Copyright
© EDP Sciences, 2011

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