Elementary excitations of magnetically ordered systems with orbital degeneracy

Details Elementary excitations of magnetically ordered systems with orbital degeneracy Elementary excitations of magnetically ordered systems with orbital degeneracy

1998-12-16

arxiv.org/abs/cond-mat/9812289v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 2 figures

Scientific paper

The Holstein-Primakoff transformation is generalized to develop a quantum flavor wave theory for spin systems with orbital degeneracy. Elementary excitations consist of spin, orbital, and spin-orbital waves. Spin and spin-orbital waves couple each other due to orbital anisotropy and Hund's rule, resulting in new modes observable by inelastic neutron scattering. In the SU(4) limit, flavor waves are dispersionless along one or more directions, and give rise to quantum fluctuations of reduced dimensionality.

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