Theory of phonon-assisted forbidden optical transitions in spin-gap systems

Cépas, O and Ziman, T (2004) Theory of phonon-assisted forbidden optical transitions in spin-gap systems. In: Physical Review B (Condensed Matter and Materials Physics), 70 (2). 024404-1.

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Abstract

We consider the absorption of light with emission of one $S_{tot}=1$ magnetic excitation in systems with a spin gap induced by quantum fluctuations. We argue that an electric-dipole transition is allowed on the condition that a virtual phonon instantaneously breaks the inversion symmetry. We derive an effective operator for the transition and argue that the proposed theory explains the polarized experiments in $CuGeO_3$ and $SrCu_2sBO_3d_2$.

Item Type:	Journal Article
Publication:	Physical Review B (Condensed Matter and Materials Physics)
Publisher:	American Physical Society
Additional Information:	The copyright belongs to American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	19 Apr 2006
Last Modified:	09 Jan 2013 05:23
URI:	http://eprints.iisc.ac.in/id/eprint/6360

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