Formation of energy gap in higher dimensional spin-orbital liquids

Details Formation of energy gap in higher dimensional spin-orbital liquids Formation of energy gap in higher dimensional spin-orbital liquids

2001-09-13

arxiv.org/abs/cond-mat/0109234v1

Europhys. Lett. 57, 274 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages with 1 figure

Scientific paper

10.1209/epl/i2002-00572-5

A Schwinger boson mean field theory is developed for spin liquids in a symmetric spin-orbital model in higher dimensions. Spin, orbital and coupled spin-orbital operators are treated equally. We evaluate the dynamic correlation functions and collective excitations spectra. As the collective excitations have a finite energy gap, we conclude that the ground state is a spin-orbital liquid with a two-fold degeneracy, which breaks the discrete spin-orbital symmetry. Possible relevence of this spin liquid state to several realistic systems, such as CaV$_4$V$_9$ and Na$_2$Sb$_2$Ti$_2$O, are discussed.

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