Eur. Phys. J. Special Topics 217, 13-27 (2013)
https://doi.org/10.1140/epjst/e2013-01750-2

Regular Article

Magnetic properties of commensurate Bose-Bose mixtures in one-dimensional optical lattices

¹ Dipartimento di Fisica dell'Università di Bologna and INFN, via Irnerio 46, 40126 Bologna, Italy
² Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria

Received: 12 October 2012
Revised: 15 January 2013
Published online: 11 March 2013

Abstract

We investigate magnetic properties of strongly interacting bosonic mixtures confined in one dimensional geometries, focusing on recently realized ⁸⁷Rb-⁴¹K gases with tunable interspecies interactions. By combining analytical perturbation theory results with density-matrix-renormalization group calculations, we provide quantitative estimates of the ground state phase diagram as a function of the relevant microscopic quantities, identifying the more favorable experimental regimes in order to access the various magnetic phases. Finally, we qualitatively discuss the observability of such phases in realistic setups when finite temperature effects have to be considered.