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 nonvanishing value of the spin glass order parameter across the boundary between a ferromagnetic phase and a dimer phase exhibiting random singlet order. We also study the distribution of the block entanglement entropy in the different regions.
Original language | English |
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Article number | 235128 |
Journal | Physical Review B (Condensed Matter) |
Volume | 95 |
Issue number | 23 |
DOIs | |
Publication status | Published - 15 Jun 2017 |
Bibliographical note
9 pages, 8 figuresKeywords
- cond-mat.quant-gas
- quant-ph