Affiliation:
1. Northeastern University
Abstract
We study a generalized quantum spin ladder with staggered long range
interactions that decay as a power-law with exponent
\alphaα.
Using large scale quantum Monte Carlo (QMC) and density matrix
renormalization group (DMRG) simulations, we show that this model
undergoes a transition from a rung-dimer phase characterized by a
non-local string order parameter, to a symmetry broken N'eel phase. We
find evidence that the transition is second order. In the magnetically
ordered phase, the spectrum exhibits gapless modes, while excitations in
the gapped phase are well described in terms of triplons – bound states
of spinons across the legs. We obtain the momentum resolved spin dynamic
structure factor numerically and find a well defined triplon band that
evolves into a gapless magnon dispersion across the transition. We
further discuss the possibility of deconfined criticality in this
model.
Funder
National Science Foundation
Subject
General Physics and Astronomy
Cited by
4 articles.
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