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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 | | Abstract: | We 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 | | Services: | Forum | Review | PDF | Favorites | |
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