Spin structure factor and quantum phases of frustrated spin-1/2 chains
Strongly Correlated Electrons
2014-05-08 v1
Abstract
The static structure factor S(q) of frustrated spin-1/2 chains with isotropic exchange and a singlet ground state (GS) diverges at wave vector q_m when the GS has quasi-long-range order (QLRO) with periodicity 2\pi/q_m but S(q_m) is finite in bond-order-wave (BOW) phases with finite-range spin correlations. Exact diagonalization and density matrix renormalization group (DMRG) calculations of S(q) indicate a decoupled phase with QLRO and q_m = \pi/2 in chains with large antiferromagnetic exchange between second neighbors. S(q_m) identifies quantum phase transitions based on GS spin correlations.
Keywords
Cite
@article{arxiv.1405.1578,
title = {Spin structure factor and quantum phases of frustrated spin-1/2 chains},
author = {Manoranjan Kumar and Aslam Parvej and Z. G. Soos},
journal= {arXiv preprint arXiv:1405.1578},
year = {2014}
}
Comments
5 pages and 4 figures, Submitted