Phase diagram of a Heisenberg spin-Peierls model with quantum phonons

Details Phase diagram of a Heisenberg spin-Peierls model with quantum phonons Phase diagram of a Heisenberg spin-Peierls model with quantum phonons

1998-12-29

arxiv.org/abs/cond-mat/9812409v2

Physical Review Letters vol. 83, 408, 1999

Physics

Condensed Matter

RevTeX, 5 pages, 3 eps figures included using epsf. Improved theories in adiabatic and non-adiabatic regimes give better agree

Scientific paper

10.1103/PhysRevLett.83.408

Using a new version of the density-matrix renormalization group we determine the phase diagram of a model of an antiferromagnetic Heisenberg spin chain where the spins interact with quantum phonons. A quantum phase transition from a gapless spin-fluid state to a gapped dimerized phase occurs at a non-zero value of the spin-phonon coupling. The transition is in the same universality class as that of a frustrated spin chain, which the model maps to in the anti-adiabatic limit. We argue that realistic modeling of known spin-Peierls materials should include the effects of quantum phonons.

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