Local polariton states in impure ionic crystals

V. S. Podolsky; Lev I. Deych; A. A. Lisyansky

doi:10.1103/physrevb.57.5168

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arXiv · cond-mat/9708028

Local polariton states in impure ionic crystals

V. S. Podolsky·Lev I. Deych·A. A. Lisyansky

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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.

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V. S. Podolsky, Lev I. Deych, A. A. Lisyansky. 1998-01-06. Local polariton states in impure ionic crystals. https://doi.org/10.1103/physrevb.57.5168

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