Bipolarons and Tunnelling States
Two distinct types of localized state are commonly assumed to exist in amorphous semiconductors and insulators. Optical absorption, and electrical conductivity above 77 K involve localized electron states in contrast to acoustic, thermal and dielectric experiments below 1 K, which are commonly interpreted in terms of localized states involving atomic motion. However this apparent clear-cut distinction is an over-simplification: for example it neglects strong electron-phonon interaction in the localized electron states, which implies that electron motion necessarily involves atomic motion. It is the purpose of this contribution to examine the relationship between these two kinds of localized state.
KeywordsElectron Spin Resonance Atomic Motion Induce Dipole Moment Tunnelling State Localize Electron State
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