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Quantum Phase Diagram of an Exactly Solved Mixed Spin Ladder

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Abstract

We investigate the quantum phase diagram of the exactly solved mixed spin-(1/2,1) ladder via the thermodynamic Bethe ansatz (TBA). In the absence of a magnetic field the model exhibits three quantum phases associated with su(2), su(4), and su(6) symmetries. In the presence of a strong magnetic field, there is a third and full saturation magnetization plateaux within the strong antiferromagnetic rung coupling regime. Gapless and gapped phases appear in turn as the magnetic field increases. For weak rung coupling, the fractional magnetization plateau vanishs and the model undergoes new quantum phase transitions. However, in the ferromagnetic coupling regime, the system does not have a third saturation magnetization plateau. The critical behaviour in the vicinity of the critical points is also derived systematically using the TBA.

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Authors and Affiliations

  1. Department of Theoretical Physics, Research School of Physical Sciences and Engineering, Australia

    M. T. Batchelor, X.-W. Guan & N. Oelkers

  2. Centre for Mathematics and its Applications, Mathematical Sciences Institute, Australian National University, Canberra ACT, 0200, Australia

    M. T. Batchelor, X.-W. Guan & N. Oelkers

  3. Instituto de Física da UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, Brasil

    Z.-J. Ying

  4. Hangzhou Teachers College, Hangzhou, 310012, People's Republic of China

    Z.-J. Ying

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  1. M. T. Batchelor
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  3. N. Oelkers
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  4. Z.-J. Ying
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Batchelor, M.T., Guan, XW., Oelkers, N. et al. Quantum Phase Diagram of an Exactly Solved Mixed Spin Ladder. Journal of Statistical Physics 116, 571–589 (2004). https://doi.org/10.1023/B:JOSS.0000037225.79748.98

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