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07 July 2020
 
  » arxiv » cond-mat/9708028

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Local polariton states in impure ionic crystals
V.S. Podolsky ; Lev I. Deych ; A.A. Lisyansky ;
Date 4 Aug 1997
Journal Phys. Rev. B 1998, Vol. 57, p. 5168.
Subject cond-mat
AbstractWe consider the dynamics of an ionic crystal with a single impurity in the vicinity of the polariton resonance. We show that if the polariton spectrum of the host crystal allows for a gap between polariton branches, the defect gives rise to a novel kind of local states with frequencies within the gap. Despite the atomic size of the impurity we find that new local states are predominated by long-wavelength polaritons. The properties of these states are shown to be different from the properties of the well-known vibrational local states. The difference is due to the singular behavior of the density of states of polaritons near the low-frequency boundary of the polariton gap. Assuming cubic simmetry of the defect site we consider a complete set of the local states arising near the bottom of the polariton gap.
Source arXiv, cond-mat/9708028
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