Work

Magnetic phase transition in disordered interacting Dirac fermion systems via the Zeeman field

Year: 2022

Type: article

Abstract: Using the determinant quantum Monte Carlo method, we investigate the antiferromagnetic phase transition that is induced by the Zeeman field in a disordered interacting two-dimensional Dirac fermion system. At a fixed interaction strength $U$, the antiferromagnetic correlation is enhanced as the magnetic field increases and, when the magnetic field is larger than a ${B}_{c}(U)$, the antiferromagnetic correlation shall be suppressed by the increased magnetic field. The impact of Zeeman field $B$, Coulomb repulsion $U$, and disorder $\mathrm{\ensuremath{\Delta}}$ is not isolated. The intensity of magnetic field effect on the antiferromagnetic correlation shall be strongly suppressed by disorder. Differently, it will be promoted by weak interaction, but, when $U$ becomes larger than ${U}_{c}=4.5$, the increased interaction will suppress the intensity of this effect and here ${U}_{c}=4.5$ coincides with the critical strength inducing the metal-Mott insulator transition in a clean system. Moreover, at a fixed magnetic field $B$, strong interaction shall suppress the antiferromagnetic phase rather than promote it.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.105.205121

Authors: Jingyao Meng, Lufeng Zhang, Tianxing Ma, Hai-Qing Lin

Institutions: Beijing Normal University, Beijing University of Posts and Telecommunications, Beijing Computational Science Research Center

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Beijing Normal University, National Safety Academic Fund

Awards: 海森堡模型和Kitaev模型的元激发、激发谱和量子相变, G6888354234