Distinctive Electronic and Spin Properties Driven by Strong Interlayer Hybridization in the α-Tellurene/GaTe Bilayer

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Combining 2D monolayer materials into heterostructures tailors their physical properties.
• Van der Waals heterostructures (vdWHs) offer tunable electronic and spin characteristics.

Purpose of the Study:

• To design and investigate a novel 2D bilayer α-tellurene/GaTe (Te/GaTe) van der Waals heterostructure (vdWH).
• To explore the electronic, spin, and optical properties arising from strong interlayer hybridization in the Te/GaTe vdWH.

Main Methods:

• Utilizing first-principles calculations to model the Te/GaTe vdWH.
• Analyzing the electronic band structure, carrier mobility, and spin properties.

Main Results:

• The Te/GaTe vdWH is an intrinsic type-I vdWH with an indirect band gap of 0.65 eV.
• Calculated high carrier mobility of 10^3 cm^2/V/s and unique optical properties were observed.
• Significant spin effects, including a Rashba effect (0.75 eV Å), were driven by strong interlayer hybridization and broken symmetry.

Conclusions:

• The novel 2D Te/GaTe semiconductor vdWH exhibits distinctive electronic, spin, and optical properties.
• Strong interlayer hybridization significantly influences the material's characteristics, making them tunable via strain and electric fields.
• This Te/GaTe vdWH holds promise for applications in next-generation electronics and spintronics.