Mott glass phase in a diluted bilayer Heisenberg quantum antiferromagnet

26th IUPAP Conference on Computational Physics

物理学;计算机科学

Ma, Nv-Sen^1 ; Sandvik, Anders W.^2 ; Yao, Dao-Xin^1

State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou

510275, China^1

Department of Physics, Boston University, 590 Commonwealth Avenue, Boston

MA

02215, United States^2

关键词: Ground state phase diagram;    Interlayer interactions;    Percolation thresholds;    Phase transition point;    Quantum antiferromagnets;    Quantum Monte Carlo simulations;    Stretched exponential;    Uniform susceptibility;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/640/1/012045/pdf
DOI  :  10.1088/1742-6596/640/1/012045

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We use quantum Monte Carlo simulations to study a dimer-diluted S = 1/2 Heisenberg model on a bilayer square lattice with intralayer interaction J1and interlayer interaction J2. Below the classical percolation threshold pc, the system has three phases reachable by tuning the interaction ratio g = J2/J1: a Néel ordered phase, a gapless quantum glass phase, and a gapped quantum paramagnetic phase. We present the ground-state phase diagram in the plane of dilution p and interaction ratio g. The quantum glass phase is certified to be of the gapless Mott glass type, having a uniform susceptibility vanishing at zero temperature T and following a stretched exponential form at T > 0; χuexp(-b/Tα) with α