Resolving spin-orbit- and hyperfine-mediated electric dipole spin resonance in a quantum dot

Area of Science:

• Quantum physics
• Solid-state physics
• Spintronics

Background:

• Controlling single-electron spins is crucial for quantum computing.
• Electric dipole spin resonance (EDSR) is a key technique for spin manipulation.
• Understanding EDSR mechanisms in quantum dots is essential for advancing spintronic devices.

Purpose of the Study:

• To investigate the electric manipulation of a single-electron spin in a gate-defined quantum dot.
• To analyze the impact of hyperfine- and spin-orbit-mediated EDSR conditions at high magnetic fields.
• To understand the observed wide and asymmetric spin inversion response.

Main Methods:

• Experimental investigation of electric manipulation of a single-electron spin.
• Utilizing adiabatic rapid passage technique for electron spin inversion.
• Performing simulations to interpret experimental results and line shapes.

Main Results:

• Observed significant consequences of previously neglected differences between hyperfine- and spin-orbit-mediated EDSR conditions at high magnetic fields.
• Recorded an unusually wide and asymmetric response in electron spin inversion as a function of magnetic field.
• Simulations confirmed the interpretation of the line shape in terms of four distinct resonance conditions.

Conclusions:

• The interplay between different EDSR mechanisms is critical for high-field electron spin control in quantum dots.
• The findings provide a detailed understanding of spin resonance line shapes.
• This research opens possibilities for isotope-selective control of dynamic nuclear polarization in quantum dots.