A graphene-based hybrid material with quantum bits prepared by the double Langmuir-Schaefer method

Area of Science:

• Materials Science
• Quantum Computing
• Surface Chemistry

Background:

• Scalability and stability of molecular qubits on surfaces are vital for advanced electronic devices.
• Integrating molecular qubits into functional systems requires robust deposition techniques.

Purpose of the Study:

• To prepare and characterize copper(ii)dibenzoylmethane [Cu(dbm)2] molecular qubits on graphene substrates.
• To assess the stability and magnetic properties of these molecular qubits after deposition.

Main Methods:

• Modified Langmuir-Schaefer (LS) deposition technique for molecular qubit preparation.
• Double LS deposition to create few-layer graphene (FLG) on Si/SiO2 substrates.
• Characterization using high-frequency electron spin resonance (HF-ESR), Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM).

Main Results:

• Successfully deposited Cu(dbm)2 molecular qubits onto a graphene-based substrate.
• HF-ESR confirmed that magnetic properties were maintained post-deposition.
• Spectroscopic and imaging techniques verified the integrity and stability of the deposited molecular qubits.

Conclusions:

• Demonstrated a controlled wet-chemistry protocol for preparing molecular quantum bits on disordered graphene.
• The study highlights the robustness of the Cu(dbm)2 system for potential large-scale quantum bit fabrication.
• This approach paves the way for stable and intact molecular qubits in electronic applications.