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

Abstract

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.

arXiv comment6 pages, 7 figures

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• Quantum phase transitions in a spin-1/2 alternating Heisenberg antiferromagnetic chain under a staggered transverse magnetic field
• Magnetic properties of the spin $S=1/2$ Heisenberg chain with hexamer modulation of exchange
• Zero-temperature study of a tetrameric spin-$1/2$ chain in a transverse magnetic field
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