Alternating Heisenberg Spin-1/2 Chains in a Transverse Magnetic Field

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Mahdavifar, Saeed
Akbari, Alireza
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Abstract
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The ground state phase diagram of the alternating spin-1/2 chains with anisotropic ferromagnetic coupling under the influence of a symmetry breaking transverse magnetic field is studied. We have used the exact diagonalization technique. In the limit where the antiferromagnetic coupling is dominant, we have identified two Ising-type quantum phase transitions. We have calculated two critical fields $h_{c_{1}}$ and $h_{c_{2}}$, corresponding to the transition between different magnetic phases of the system. It is found that the intermediate state ($h_{c_{1}}<h<h_{c_{2}}$) is gapful, describing the stripe-antiferromagnetic phase.
Comment: 6 pages, 7 figures
Keywords
Condensed Matter - Strongly Correlated Electrons
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