Competing phases in spin ladders with ring exchange and frustration
Abstract
The ground state properties of spin-1/2 ladders are studied, emphasizing the role of frustration and ring exchange coupling. We present a unified field theory for ladders with general coupling constants and geometry. Rich phase diagrams can be deduced by using a renormalization group calculation for ladders with in--chain next nearest neighbor interactions and plaquette ring exchange coupling. In addition to established phases such as Haldane, rung singlet, and dimerized phases, we also observe a surprising instability towards an incommensurate phase for weak interchain couplings, which is characterized by an exotic coexistence of self-consistent ferromagnetic and anti-ferromagnetic order parameters.
Keywords
Cite
@article{arxiv.1612.00016,
title = {Competing phases in spin ladders with ring exchange and frustration},
author = {Alexandros Metavitsiadis and Sebastian Eggert},
journal= {arXiv preprint arXiv:1612.00016},
year = {2017}
}
Comments
8 pages, 5 figures. For more information and the latest versions see http://www.physik.uni-kl.de/eggert/papers/index.html