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Effect of electron-phonon interaction on surface states in a ternary mixed crystal |
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| Authors: | Zu Wei Yan Xi Xia Liang |
| Affiliation: | (1) CCAST (World Laboratory), PO Box 8730, Beijing 100080, P.R. China, CN;(2) Laboratory of Solid State Physics, Department of Physics, Inner Mongolia University, Hohhot 010021, P.R. China, CN;(3) Department of Basic Sciences, Inner Mongolia Agricultural University, Hohhot 010018, P.R. China, CN |
| Abstract: | 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. Received 4 January 1999 and Received in final form 7 January 2000 |
| Keywords: | 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 |
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