Semi-quantized Spin Pumping and Spin-Orbit Torques in Topological Dirac Semimetals

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Topological Dirac semimetals are novel quantum materials with unique electronic properties.
• Spintronics aims to utilize electron spin for information processing, requiring efficient spin-charge conversion.

Purpose of the Study:

• Investigate spin and charge transport in topological Dirac semimetals coupled to ferromagnetic insulators.
• Explore the potential of these materials for low-dissipation spintronic applications.

Main Methods:

• Theoretical study of spin and charge transport dynamics.
• Analysis of inverse spin Hall effect and spin-charge conversion efficiency.
• Investigation of spin torque effects on magnetization.

Main Results:

• Topological Dirac semimetals exhibit a large inverse spin Hall effect when coupled to ferromagnetic insulators.
• Induced charge current is semi-quantized and largely independent of disorder strength.
• Electric fields applied to the semimetal generate spin torque on the ferromagnet.

Conclusions:

• Topological Dirac semimetals provide a highly efficient and less-dissipative platform for spin-charge conversion.
• These materials are promising for advanced spintronic devices, including low-power spin switching applications.