https://doi.org/10.1007/s100510051156
Effect of electron-phonon interaction on surface states in a ternary mixed crystal
1
Laboratory of Solid State Physics, Department of Physics,
Inner Mongolia University, Hohhot 010021, P.R. ChinaMailing address
2
Department of Basic Sciences, Inner Mongolia Agricultural University,
Hohhot 010018, P.R. China
3
CCAST (World Laboratory), PO Box 8730, Beijing 100080, P.R. China
Received:
4
January
1999
Revised:
7
January
2000
Published online: 15 June 2000
A variational theory is proposed to study the surface states of electrons in a semi-infinite ternary mixed crystal, by taking the effect of electron-surface optical (SO) phonon interaction into account. The energy and the wave function of the electronic surface-states are calculated. The numerical results of the energies of the surface states of the polarons and the self-trapping energies are obtained as functions of the composition x and surface potential V0 for several ternary mixed crystal materials. The results show that the electron-phonon interaction lowers the surface-state levels with the energies from several to scores of meV. It is also found that the self-trapping energy of the surface polaron has a minimum at some middle value of the composition x. It is indicated that the electron-phonon coupling effect can not be neglected.
PACS: 63.20.Kr – Phonon electron and phonon phonon interactions / 71.38.+i – Polarons and electron phonon interactions / 73.20.At – Surface states, band structure, electron density of states
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
