Giant spin signals in chemically functionalized multiwall carbon nanotubes

Area of Science:

• Quantum Information Science
• Condensed Matter Physics
• Materials Science

Background:

• Transporting quantum information, specifically spin, over significant distances is crucial for future electronic devices.
• Nontopologically protected systems face challenges due to the instability of spin states during transport.

Purpose of the Study:

• To demonstrate a viable method for long-distance quantum spin transport.
• To enable the development of low-voltage spin-logic devices and advance beyond-CMOS technology.

Main Methods:

• Injection of a spin-polarized charge current via ferromagnetic metal/molecule interfaces.
• Utilizing multiwall carbon nanotubes as nanoguides for spin transport, leveraging weak spin-orbit and hyperfine interactions.
• Electrical conversion of spin information using a strong magnetoresistive effect.

Main Results:

• Successful transport of spin information over micrometric to millimetric distances.
• Exceptional spin transport properties demonstrated in the experimental system.
• Experimental findings qualitatively supported by theoretical calculations.

Conclusions:

• A novel approach combining specific material interfaces and nanostructures enables robust quantum spin transport.
• This method provides a pathway for realizing advanced spin-based electronic circuits.
• The findings represent a significant step towards next-generation computing technologies.