Volume 134, Number 1, April 2021
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|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
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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