Exact ground state of a spin ladder with a quantum phase transition |
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Authors: | W Brzezicki A M Oleś |
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Institution: | 1.Marian Smoluchowski Institute of Physics, Jagellonian University,Kraków,Poland;2.Max-Planck-Institut für Festk?rperforschung,Stuttgart,Germany |
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Abstract: | We introduce a spin ladder with Ising interactions along the legs and intrinsically frustrated Heisenberg-like ferromagnetic
interactions on the rungs. The model is solved exactly in the subspaces relevant for the ground state by mapping to the quantum
Ising model, and we show that a first order quantum phase transition separates the classical from quantum regime, with the
spin correlations on the rungs being either ferromagnetic or antiferromagnetic, and different spin excitations in both regimes.
The present case resembles the quantum phase transition found in the compass model in one and two dimensions. |
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Keywords: | PACS" target="_blank">PACS 75 10 Jm Quantized spin models 64 70 Tg Quantum phase transitions 75 10 Pq Spin chain models |
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