Quantum phase transition in the SU(4) spin-orbital model on the triangular lattice

Article

关键词: GROUND-STATE;    HEISENBERG-ANTIFERROMAGNET;    EXACT SPECTRA;    VALENCE-BOND;    ORDER;    DEGENERACY;    EXCITATIONS;    FRUSTRATION;    INSULATOR;    DISORDER;   

DOI  :  10.1103/PhysRevB.68.012408

来源: SCIE

【 摘 要 】

Motivated by the absence of a cooperative Jahn-Teller effect in LiNiO2 and BaVS3, two layered oxides with triangular planes, we study the SU(4) symmetric spin-orbital model on the triangular lattice. Upon reducing the next-nearest-neighbor coupling, we show that the system undergoes a quantum phase transition to a liquid phase. A variational approach to this liquid phase shows that simple types of long-range correlations are suppressed, suggesting that it is stable against lattice distortions.

【 授权许可】

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