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On the Ground State of Spin Systems with Orbital Degeneracy
SU(4) symmetry spin liquid spin order
orbital order
2007/8/15
2002Vol.37No.1pp.105-110DOI:
On the Ground State of Spin Systems with Orbital Degeneracy
SHI Da-Ning,1,2 LI Ning1 and YANG Zhi-Hong1
1 College of Science, Nanjing Univ...
The Hubbard model for electrons with orbital degeneracy is shown to have an underlying SU_d(4) symmetry of spin-orbital double. A hidden charge SU_c(4) symmetry is exposed and an extended Lieb-Mattis ...