Gate-controllable quadri-layertronics in a 2D multiferroic antiferromagnet.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Layertronics systems typically exhibit binary physics, limiting their functional complexity.
• The layer Hall effect is a key phenomenon in layertronics, but its manipulation is constrained by intrinsic material properties.

Purpose of the Study:

• To engineer layertronics beyond binary physics into a quaternary mode, termed quadri-layertronics.
• To explore the mechanism enabling quadri-layertronics through the interplay of ferroelectricity, valley physics, and antiferromagnetism.
• To demonstrate gate voltage control over quadri-layertronics for selective induction and detection of the layer Hall effect.

Main Methods:

• Symmetry arguments and a low-energy k·p model were employed to theoretically establish the quaternary physics.
• First-principles calculations were used to verify the proposed phenomena in a specific material system.
• Investigation of interlayer dipole arrangements and their control via gate voltage.

Main Results:

• Demonstrated the theoretical possibility of quadri-layertronics, a four-state layer physics mode.
• Identified the mechanism involving out-of-plane ferroelectricity and valley physics in an antiferromagnetic multiferroic quadrilayer.
• Showcased gate-tunable control of quadri-layertronics in OsCl2 quadrilayer, enabling selective layer Hall effect manipulation.

Conclusions:

• Quadri-layertronics significantly expands the physics accessible in layertronic systems.
• Gate-controlled manipulation of interlayer dipoles offers a novel pathway for advanced electronic functionalities.
• The findings enrich the understanding of layertronics and open avenues for novel electronic device applications.