Quantum Phase Transition in Antiferromagnetic Heisenberg Chains Coupled to Phonons

Abstract

We develop an analytical approach based on a unitary transformation to investigate S=1/2 antiferromagnetic Heisenberg chains coupled to phonons, and find a new quantum phase transition at zero temperature. Although the usual phase transition occurs depending on the strengths of the spin-spin and spin-phonon interactions, the phase transition in the present work is induced by a change in the geometrical structure of the spin-phonon interaction. The magnetic properties of the phase transition can be understood in relation to a phase transition that has already been found in the frustrated J1-J2 model.

6 pages, 6 figures. To be published in J. Phys. Soc. Jpn

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Cited by in corpus (2)

• Spontaneous distortion in the spin-1/2 Ising-Heisenberg model on decorated planar lattices with a magnetoelastic coupling
• Tuning magnetic interactions with nonequilibrium optical phonon populations: a theoretical study