2020/08/31 by Muwei Wu, Dao‐Xin Yao, Dao-Xin Yao +1
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Condensed matter physics #Excited state #Ferromagnetism #Hamiltonian (control theory) #Heisenberg model #Hexagonal lattice #Lattice (music) #Magnetic field #Magnetization #Mathematics #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Randomness #Singlet state #Spin (aerodynamics) #Spin glass #Statistics #Theoretical and Computational Physics #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.103.205122
published as Phys. Rev. B 103, 205122 (2021) · 17 pages, 30 figures
openalex created_date 2020/09/08 · openalex publication_date 2021/05/13 · arxiv created 2021/05/16 · arxiv updated 2021/05/18 · openalex updated_date 2026/08/05
Employing exact diagonalization, we systematically study the anisotropic Heisenberg model which is related to rare-earth triangular-lattice materials. We probe its full 3D phase diagram afresh and identify a large region of quantum spin liquid (QSL) phase which can extend to the QSL region of the J1--J2 triangular Heisenberg model. Furthermore, we explore the magnetization curves of different phases and reproduce the 1/3-magnetization plateau in the quantum spin liquid phase region. More importantly, to study the possible chemical disorders in real materials, we consider the randomness of exchange interactions and find no spin glass order. And there is a large region of random-singlet phase which contains strongly random spin networks, dominated by two-spin singlets, four-spin singlets and other singlet domains. Our comprehensive ED study can give detailed insightful understanding of the microscopic Hamiltonian related to the YbMgGaO4 and some other related rare-earth triangular-lattice materials.