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Raman Scattering and Anomalous Current Algebra: Observation of Chiral Bound State in Mott Insulators

D. V. Khveshchenko·P. B. Wiegmann
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Abstract

Recent experiments on inelastic light scattering in a number of insulating cuprates [1] revealed a new excitation appearing in the case of crossed polarizations just below the optical absorption threshold. This observation suggests that there exists a local exciton-like state with an odd parity with respect to a spatial reflection. We present the theory of high energy large shift Raman scattering in Mott insulators and interpret the experiment [1] as an evidence of a chiral bound state of a hole and a doubly occupied site with a topological magnetic excitation. A formation of these composites is a crucial feature of various topological mechanisms of superconductivity. We show that inelastic light scattering provides an instrument for direct measurements of a local chirality and anomalous terms in the electronic current algebra.

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D. V. Khveshchenko, P. B. Wiegmann. 1994-02-09. Raman Scattering and Anomalous Current Algebra: Observation of Chiral Bound State in Mott Insulators. https://doi.org/10.1103/physrevlett.73.500

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