Field-Induced Phase Transitions of Repulsive Spin-1 Bosons in Optical Lattices

K. Rodríguez, A. Argüelles, A. K. Kolezhuk, L. Santos, and T. Vekua
Phys. Rev. Lett. 106, 105302 – Published 9 March 2011

Abstract

We study the phase diagram of repulsively interacting spin-1 bosons in optical lattices at unit filling, showing that an externally induced quadratic Zeeman effect may lead to a rich physics characterized by various phases and phase transitions. We find that the main properties of the system may be described by an effective field model, which provides the precise location of the phase boundaries for any dimension, in excellent agreement with our numerical calculations for one-dimensional (1D) systems. Thus, our work provides a quantitative guide for the experimental analysis of various types of field-induced quantum phase transitions in spin-1 lattice bosons. These transitions, which are precluded in spin-12 systems, may be realized by using an externally modified quadratic Zeeman coupling, similar to recent experiments with spinor condensates in the continuum.

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  • Received 21 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.105302

© 2011 American Physical Society

Authors & Affiliations

K. Rodríguez1, A. Argüelles1, A. K. Kolezhuk2,3, L. Santos1, and T. Vekua1

  • 1Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstrasse 2 D-30167, Hannover, Germany
  • 2Institute of Magnetism, National Academy of Sciences and Ministry of Education, 36-b Vernadskii Avenue, 03142 Kiev, Ukraine
  • 3Institute of High Technologies, T. G. Shevchenko Kiev National University, 64 Volodymyrska Street, 01601 Kiev, Ukraine

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Vol. 106, Iss. 10 — 11 March 2011

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