Vertical-strain-induced spin-splitting in zigzag graphene nanoribbons

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Graphene nanoribbons (GNRs) exhibit unique electronic and spintronic properties.
• Controlling these properties is crucial for developing next-generation electronic devices.
• Strain engineering offers a promising pathway to tune GNR characteristics.

Purpose of the Study:

• To investigate the impact of vertical strain on the spintronic properties of zigzag graphene nanoribbons.
• To understand how local deformations induced by strain affect spin-splitting.
• To identify optimal conditions for maximizing spin-splitting in these nanostructures.

Main Methods:

• First-principles calculations were employed to simulate the electronic band structure.
• The effects of varying strain-induced deformation parameters (position, depth, size) were systematically analyzed.
• Energy band splitting, specifically spin-splitting, was the primary property investigated.

Main Results:

• Vertical strain can induce apparent spin-splitting in the energy bands of zigzag graphene nanoribbons.
• Spin-splitting is most pronounced at the bottom of the conduction band.
• The magnitude of spin-splitting is sensitive to the position, depth, and size of the local deformation.

Conclusions:

• Local deformation via vertical strain is an effective method to control spin-splitting in zigzag GNRs.
• An optimal deformation position was identified, enhancing spin-splitting.
• Further optimization of deformation depth and size can precisely tune spintronic properties for potential device applications.