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arXiv · 1702.01765

Magnetic phases of spin-1 lattice gases with random interactions

Kenneth D. McAlpine·Simone Paganelli·Sergio Ciuchi·Anna Sanpera·Gabriele De Chiara
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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.

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Kenneth D. McAlpine, Simone Paganelli, Sergio Ciuchi, Anna Sanpera, Gabriele De Chiara. 2017-02-06. Magnetic phases of spin-1 lattice gases with random interactions. https://doi.org/10.1103/physrevb.95.235128

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