Spin-resolved transport of multifunctional C₁₈molecule-based nanodevices: a first-principles study

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Cyclic C18 molecule, a polyalkylene with alternating single and triple bonds, exhibits semiconducting properties.
• The potential for carbon-based molecular devices is suggested by C18's properties.
• Previous research established C18 synthesis and basic characterization.

Purpose of the Study:

• To investigate the spin-resolved electronic transport properties of nanodevices incorporating the C18 molecule.
• To explore the feasibility of C18-based molecular devices for spintronic applications.
• To analyze spin filtering, spin rectification, and negative differential resistance effects.

Main Methods:

• Computational analysis of spin-resolved electronic transport.
• Designing nanodevices with C18 sandwiched between zigzag graphyne or graphene nanoribbon leads.
• Analysis of transmission spectra, local density of states, molecular projection Hamiltonian, and Current-Voltage (I-V) characteristics.

Main Results:

• Demonstrated significant spin-filtering and spin-rectifying effects.
• Observed obvious negative differential resistance behavior in the designed devices.
• Confirmed stable dual-spin filtering and diode effects in antiparallel lead configurations.

Conclusions:

• The C18 molecular nanodevices exhibit promising multifunctional spintronic properties.
• Detailed analysis of electronic transport mechanisms provides insights into device behavior.
• These findings are crucial for the development of advanced spintronic nanodevices.