Intrinsic coupling of orbital excitations to spin fluctuations in Mott insulators

Details Intrinsic coupling of orbital excitations to spin fluctuations in Mott insulators Intrinsic coupling of orbital excitations to spin fluctuations in Mott insulators

2011-09-22

arxiv.org/abs/1109.4745v1

Phys. Rev. Lett. 107, 147201 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, supplementary material included; accepted in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.107.147201

We show how the general and basic asymmetry between two fundamental degrees of freedom present in strongly correlated oxides, spin and orbital, has very profound repercussions on the elementary spin and orbital excitations. Whereas the magnons remain largely unaffected, orbitons become inherently coupled with spin fluctuations in spin-orbital models with antiferromagnetic and ferroorbital ordered ground states. The composite orbiton-magnon modes that emerge fractionalize again in one dimension, giving rise to spin-orbital separation in the peculiar regime where spinons are faster than orbitons.

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