Twist-angle-tunable spin texture in WSe₂/graphene van der Waals heterostructures

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Twist engineering is a key method for tuning electronic properties in van der Waals heterostructures.
• Theoretical studies predicted twist-angle-dependent spin texture modulation in graphene, but experimental evidence was lacking.

Purpose of the Study:

• To experimentally demonstrate the tunability of spin texture and spin-charge interconversion in WSe2/graphene heterostructures using twist engineering.
• To investigate the influence of twist angle on the spin-orbit properties of these heterostructures.

Main Methods:

• Spin precession experiments were conducted on WSe2/graphene heterostructures.
• The effect of varying twist angles on spin texture and spin-charge interconversion was analyzed.

Main Results:

• Tunability of spin texture and spin-charge interconversion with twist angle was experimentally confirmed.
• A radial spin component, in addition to the standard orthogonal component, was observed at specific twist angles.
• The helicity of the spin texture was shown to be reversible by altering the twist angle.

Conclusions:

• The twist angle critically influences the spin-orbit properties of WSe2/graphene heterostructures.
• This work provides experimental validation for twist-engineered spin texture modulation.
• The findings pave the way for developing novel spin-twistronic devices.