Abstract
We explore the ground-state phase diagram of a Heisenberg spin chain coupled locally to optical phonons (bond coupling), using large-scale density-matrix renormalization-group calculations and extending a unitary transformation approach which removes the spin-phonon coupling in leading order. For the quantum phase transition from the spin liquid to the dimerized phase, we find deviations from previous quantum Monte Carlo and flow equation results.
- Received 7 July 2006
DOI:https://doi.org/10.1103/PhysRevB.74.214426
©2006 American Physical Society