Magnetic Excitations of Coupled Spin Ladders: a Quantum Monte Carlo Study
Superconductivity
2015-06-25 v2 Strongly Correlated Electrons
Abstract
We calculate the magnetic excitation spectrum in the stripe phase of high-T_c materials. The stripes are modeled as coupled spin-1/2 ladders and the spin dynamics is extracted using Quantum Monte Carlo (QMC) simulations, which can capture the strong quantum fluctuations near quantum critical points of coupled spin ladders. We find a characteristic hourglass magnetic excitation spectrum with high-energy peaks rotated by 45 degrees compared to the incommensurate low-energy peaks in good agreement with the experimental data. The excitations are investigated quantitatively as a function of interladder coupling, ladder width, and domain formation with stripe disorder.
Keywords
Cite
@article{arxiv.cond-mat/0608251,
title = {Magnetic Excitations of Coupled Spin Ladders: a Quantum Monte Carlo Study},
author = {Brian M. Andersen and Olav F. Syljuasen},
journal= {arXiv preprint arXiv:cond-mat/0608251},
year = {2015}
}
Comments
4 pages, 5 figures (fig. 5 replaced)