Magnetic phases of spin-1 lattice gases with random interactions

Kenneth D. McAlpine, Simone Paganelli, Sergio Ciuchi, Anna Sanpera, and Gabriele De Chiara
Phys. Rev. B 95, 235128 – Published 15 June 2017

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.

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  • Received 13 February 2017
  • Revised 5 April 2017

DOI:https://doi.org/10.1103/PhysRevB.95.235128

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Kenneth D. McAlpine1, Simone Paganelli2, Sergio Ciuchi2,3, Anna Sanpera4,5, and Gabriele De Chiara1

  • 1Centre for Theoretical Atomic, Molecular, and Optical Physics, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, United Kingdom
  • 2Dipartimento di Scienze Fisiche e Chimiche, Università dell'Aquila, via Vetoio, I-67010 Coppito-L'Aquila, Italy
  • 3Consiglio Nazionale delle Ricerche (CNR-ISC) Via dei Taurini, I-00185 Rome, Italy
  • 4ICREA, Pg. Lluís Companys 23, E-08010 Barcelona, Spain
  • 5Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain

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Issue

Vol. 95, Iss. 23 — 15 June 2017

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