Tunable linear and nonlinear anomalous Hall transport in two-dimensional CrPS₄

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Transport

Background:

• Two-dimensional (2D) magnetic materials are gaining attention for their unique properties.
• Few-layer chromium phosphosulfide (CrPS4) is a stable 2D magnetic material of recent research interest.

Purpose of the Study:

• To investigate the anomalous Hall transport phenomena in few-layer CrPS4.
• To explore the influence of layer-dependent magnetism and symmetry on Hall effects.
• To identify potential applications in electronic and spintronic devices.

Main Methods:

• First-principles calculations were employed to study the electronic band structure and transport properties.
• Analysis focused on the relationship between magnetism, symmetry, and anomalous Hall effects.
• Band structure analysis identified gapped Dirac points as the origin of large Hall responses.

Main Results:

• Monolayer CrPS4 shows a linear anomalous Hall effect, with forbidden nonlinear response.
• Bilayer CrPS4 exhibits a pronounced nonlinear anomalous Hall effect and a layer Hall effect.
• Even-layer CrPS4 displays an in-plane anomalous Hall effect proportional to the in-plane magnetic field.

Conclusions:

• Few-layer CrPS4 hosts diverse anomalous Hall transport phenomena driven by its unique electronic and magnetic properties.
• The observed phenomena, including linear, nonlinear, layer, and in-plane Hall effects, are linked to gapped Dirac points.
• CrPS4's rich Hall transport characteristics highlight its promise for advanced electronic and spintronic applications.