Abstract:
We study the “mixed spin” isotropic ladder system having S=1 spins on one leg and S=1/2 spins on the other, with general-type exchange interactions between spins on neighboring rungs. A set of model Hamiltonians with exact ground states in the form of a certain matrix product wave function is obtained. We show that sufficiently strong frustration can lead to exotic singlet ground states with infinite (exponential) degeneracy. We also list a couple of rather simple models with nontrivial ground states, including a model with only bilinear exchange.
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Received: 2 December 1997 / Accepted: 28 January 1998
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Kolezhuk, A., Mikeska, HJ. Mixed spin ladders with exotic ground states. Eur. Phys. J. B 5, 543–550 (1998). https://doi.org/10.1007/s100510050475
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DOI: https://doi.org/10.1007/s100510050475