Issue |
EPL
Volume 134, Number 1, April 2021
|
|
---|---|---|
Article Number | 16001 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
DOI | https://doi.org/10.1209/0295-5075/134/16001 | |
Published online | 14 May 2021 |
Magnetic phase transition in the ground-state phase diagram of binary bose gases in optical lattices
1 Université Côte d'Azur, INPHYNI, CNRS - 06000 Nice, France
2 Physics Department, Loyola University New Orleans - 6363 Saint Charles Ave., New Orleans, LA 70118, USA
(a) laurentdeforgesdeparny@gmail.com (corresponding author)
Received: 16 November 2020
Accepted: 23 March 2021
We investigate the ground-state phase diagram of interacting binary Bose gases trapped in two-dimensional optical lattices by means of quantum Monte Carlo simulations. Our simulations reveal a magnetic phase transition from a ferromagnetic-order to a spin insulator inside the Mott insulating phase with two particles per site for quasi-balanced on-site inter- and intra-particle interactions, i.e.,
. This 3D-XY transition is characterized by the establishment of a finite local magnetic moment along the z-axis, ferromagnetic correlations in the
plane and by counterflow superfluidity inside the Mott phase. When decreasing
, this transition merges with the Mott-superfluid transition and becomes first order. The merging of the two transitions is investigated with respect to the
parameter.
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