Spin Dynamics and Low Energy Vibrations: Insights from Vanadyl-Based Potential Molecular Qubits

Area of Science:

• Molecular magnetism
• Quantum information science
• Solid-state chemistry

Background:

• Understanding magnetization dynamics is crucial for developing molecular quantum bits.
• Vanadyl complexes with diethyldithiocarbamate (Et2dtc-) ligands are promising candidates for such applications.
• Investigating relaxation mechanisms provides insights into quantum coherence.

Purpose of the Study:

• To investigate the magnetization dynamics of [VO(Et2dtc)2] in solid-state and frozen solution.
• To elucidate the field dependence of relaxation times and its underlying mechanisms.
• To correlate relaxation processes with molecular vibrations for designing enhanced quantum coherence.

Main Methods:

• Electron paramagnetic resonance (EPR) spectroscopy to study magnetization dynamics.
• Variable temperature and variable field measurements.
• Terahertz (THz) spectroscopy to determine low-energy vibrational modes.

Main Results:

• Observed an anomalous and unprecedented field dependence of relaxation time.
• Modeled the relaxation mechanism with three distinct contributions.
• Correlated temperature dependence of dominant low-field relaxation processes with THz-determined vibrational modes.

Conclusions:

• The study provides fundamental insights into the spin dynamics of vanadyl complexes.
• Identified key relaxation mechanisms influencing quantum coherence.
• Offers guidelines for designing molecule-based systems with enhanced quantum coherence for quantum computing applications.