Physics – Condensed Matter
Scientific paper
2003-01-28
Physical Review B 67, 064420 (2003)
Physics
Condensed Matter
10 pages, Revtex file, 5 figures
Scientific paper
10.1103/PhysRevB.67.064420
To describe the spin-orbital energy gap formation in the one-dimensional symmetrically coupled spin-orbital model, we propose a simple mean field theory based on an SU(4) constraint fermion representation of spins and orbitals. A spin-orbital gapped phase is formed due to a marginally relevant spin-orbital valence bond pairing interaction. The energy gap of the spin and orbital excitations grows extremely slowly from the SU(4) symmetric point up to a maximum value and then decreases rapidly. By calculating the spin, orbital, and spin-orbital tensor static susceptibilities at zero temperature, we find a crossover from coherent to incoherent magnetic excitations as the spin-orbital coupling decreasing from large to small values.
Hui Hu
Yu Lu
Zhang Guang-Ming
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