Quantum Phase Transition in Antiferromagnetic Heisenberg Chains Coupled to Phonons

Details Quantum Phase Transition in Antiferromagnetic Heisenberg Chains Coupled to Phonons Quantum Phase Transition in Antiferromagnetic Heisenberg Chains Coupled to Phonons

2011-08-30

arxiv.org/abs/1108.5808v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

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.

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