Phase diagram of the spin-Peierls chain with local coupling

TL;DR

This paper investigates the phase diagram of a Heisenberg spin chain with local phonon coupling, revealing new insights into the quantum phase transition from spin liquid to dimerized phases through advanced computational methods.

Contribution

It provides a detailed analysis of the ground-state phase diagram using DMRG and perturbative methods, highlighting deviations from prior quantum Monte Carlo results.

Findings

Identifies the phase boundary between spin liquid and dimerized phases.

Shows deviations from previous quantum Monte Carlo results.

Provides a comprehensive phase diagram for the model.

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 an extended perturbative analysis. 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.