https://doi.org/10.1140/epjb/e2011-20656-1
Regular Article
Exciton states and excitonic absorption spectra in a cylindrical quantum wire under transverse electric field
1
College of Physics Science and Technology, Yangzhou University,
Yangzhou
225002, P.R.
China
2
College of Physics and Electronic Information Engineering, Wenzhou
University, Wenzhou
325035, P.R.
China
a e-mail: sdwu@yzu.edu.cn
Received:
11
August
2011
Received in final form:
16
November
2011
Published online:
11
January
2012
The effects of transverse electric field on the electronic structures, exciton states and excitonic absorption spectra in a cylindrical quantum wire are theoretically investigated in detail. The quantum wire is assumed to GaAs material surrounded by the infinite potential barrier. The results show that the external electric field removes the degeneracy of the electron or hole states. The energy levels of electron and hole, exciton binding energy, excitonic absorption coefficient and absorption energy decrease with increasing the strength of the electric field or the wire radius. The effects of the electric field become more significant for wide wires. The phenomena can be explained by the reduced spatial overlap of ground electron and hole states.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012
