QC111 : Dynamic response of a quasi-one dimensional electron gas under electromagnetic radiation
Thesis > Central Library of Shahrood University > Physics > MSc > 2013
Authors:
Abstarct: Recently there has been a great deal of interest in terahertz phenomena in elec
tronic materials. This is mainly due to the rapid development of high-power, long
wavelength, and tunable laser sources such as free electron lasers. In view of this rapid
development of terahertz phenomena, a theoretical formalism describing strongly cou
pled electron-photon systems becomes urgently required. The most useful quantity in
understanding the transport and optical properties of an electronic system is the di
electric function. In this thesis, we present a theoretical investigation of the electronic
and dielectric properties of an electron gas strongly coupled to a THz radiation field.
We first calculate the charge fluctuation of the quasi-one dimensional (Q1D) electron
system using the time-dependent perturbation technique. The dielectric function can
then be derived. We obtain elementary excitation spectrum of Q1D electron systems
under THz radiation field within a parabolic confining potential. Then we study and
obtain the plasmon modes using the random-phase approximation. The resultant di
electric function shows that the plasma frequency of the system is strongly dependent
on the intensity and frequency of the THz laser field.
Keywords:
#electron gas #quasi-one dimensional #dynamic response #electronic states #nanostructure Link
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
Visitor: