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Magnetic phases of spin-1 lattice gases with random interactions

2017; American Physical Society; Volume: 95; Issue: 23 Linguagem: Inglês

10.1103/physrevb.95.235128

2469-9977

Kenneth D. McAlpine, Simone Paganelli, S. Ciuchi, Anna Sanpera, Gabriele De Chiara,

Theoretical and Computational Physics

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.