Spin polarized current in chiral organic radical monolayers

Area of Science:

• Molecular spintronics
• Quantum information science
• Organic radical chemistry

Background:

• The chirality-induced spin selectivity (CISS) effect enables chiral molecules to act as electron spin filters.
• Molecular spintronics aims to develop technologies using chiral molecules for spin-polarized currents.
• Controlling spin states in molecules is crucial for advanced electronic applications.

Purpose of the Study:

• To investigate the spin filtering capabilities of thia-bridged triarylamine hetero[4]helicene radical cations.
• To explore the potential of these organic radicals in molecular spintronics and quantum information.
• To demonstrate the chirality-induced spin selectivity (CISS) effect in a functional device.

Main Methods:

• Fabrication and characterization of a monolayer of thia[4]azahelicene radical cations on a metallic surface.
• Utilizing magnetic-conductive atomic force microscopy to assess electron spin filtering.
• Constructing a spintronic device with the chiral molecules sandwiched between electrodes.

Main Results:

• Demonstrated efficient electron spin filtering at low potentials using the chiral molecule monolayer.
• Observed asymmetric magnetoresistance with signal inversion dependent on enantiomer handedness.
• Confirmed the presence of the chirality-induced spin selectivity (CISS) effect.

Conclusions:

• Thia[4]azahelicene organic radicals exhibit significant spin filtering properties.
• These findings highlight the potential of CISS effect-based molecular radicals for quantum information operations.
• The study validates the use of chiral molecules as spin-selective components in spintronic devices.