Pure spin current and phonon thermoelectric transport in a triangulene-based molecular junction

Area of Science:

• Molecular electronics
• Spintronics
• Thermoelectric transport

Background:

• Recent experimental synthesis of triangulene enables new molecular designs.
• Molecular junctions offer tunable electronic and thermoelectric properties.

Purpose of the Study:

• Investigate electron and phonon thermoelectric transport in a triangulene-based molecular junction.
• Explore the potential for spin-polarized transport and pure spin current generation.

Main Methods:

• First-principles calculations were employed to simulate transport properties.
• Analysis included bias voltage, gate voltage, and temperature gradient effects.
• Phonon vibration effects on thermal transport were considered.

Main Results:

• Spin-polarized electric transport is effectively tunable via bias and gate voltages.
• A perfect spin filter effect is achievable by adjusting gate voltage.
• Pure spin current can be generated on a large scale by manipulating temperature and gate voltage.
• Phonon effects suppress the figure of merit, particularly between 10 K and 100 K.
• A large spin figure of merit with a small charge figure of merit is attainable.

Conclusions:

• Triangulene-based molecular junctions show potential for tunable spintronic devices.
• The system demonstrates efficient pure spin current generation.
• Favorable prospects exist for applications as spin calorigenic devices.