Disorder, three body interaction and Bose glass phase in a spinor atomic gas in an optical lattice

27th IUPAP Conference on Computational Physics

物理学;计算机科学

Nabi, Sk Noor^1 ; Basu, Saurabh^1

Department of Physics, Indian Institute of Technology Guwahati, Guwahati

Assam

781039, India^1

关键词: Antiferromagnetics;    Atomic gas;    Bose Hubbard model;    Lattice sites;    Order parameter;    Percolation analysis;    Spin-dependent interactions;    Three-body interaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/759/1/012035/pdf
DOI  :  10.1088/1742-6596/759/1/012035

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We study the effects of disorder on the spin dependent interaction term of a spinor Bose Hubbard model with a three body interaction potential. The signature of the Bose glass (BG) phase is observed by computing the fraction of the lattice sites having finite superfluid (SF) order parameter and non integer occupation densities. We obtain the phase diagram both for the antiferromagnetic (AF) and ferromagnetic (F) cases via a percolation analysis. In the AF case, the BG phase intervenes between the odd-even Mott insulating (MI) lobes (for example, the lobes corresponding to occupation densities, n=1 and (n=2) but not between the even-odd MI lobes. In the ferromagnetic case, the presence of the BG phase is observed between all the MI lobes irrespective of them being even or odd. The BG phase almost destroys the first MI lobe while the MI phase looks more stable than the SF phase both in the AF and F cases due to the presence of the three body interactions.