Magnetic phases of spin-1 lattice gases with random interactions
Abstract
A spin-1 atomic gas in an optical lattice, in the unit-filling Mott Insulator (MI) phase and in the presence of disordered spin-dependent interaction, is considered. In this regime, at zero temperature, the system is well described by a disordered rotationally-invariant spin-1 bilinear-biquadratic model. We study, via the density matrix renormalization group algorithm, a bounded disorder model such that the spin interactions can be locally either ferromagnetic or antiferromagnetic. Random interactions induce the appearance of a disordered ferromagnetic phase characterized by a non-vanishing value of spin-glass order parameter across the boundary between a ferromagnetic phase and a dimer phase exhibiting random singlet order. The study of the distribution of the block entanglement entropy reveals that in this region there is no random singlet order.
Keywords
Cite
@article{arxiv.1702.01765,
title = {Magnetic phases of spin-1 lattice gases with random interactions},
author = {Kenneth D. McAlpine and Simone Paganelli and Sergio Ciuchi and Anna Sanpera and Gabriele De Chiara},
journal= {arXiv preprint arXiv:1702.01765},
year = {2017}
}
Comments
9 pages, 8 figures, published version