Resolving Spin-Orbit and Hyperfine Mediated Electric Dipole Spin Resonance in a Quantum Dot

TL;DR

This paper explores the distinct effects of hyperfine and spin-orbit interactions on electric dipole spin resonance in quantum dots, revealing important high-field differences and potential for isotope-selective nuclear polarization.

Contribution

It uncovers the previously neglected differences between hyperfine and spin-orbit mediated resonance conditions at high magnetic fields in quantum dots.

Findings

Wide, asymmetric resonance response observed at high magnetic fields.

Simulations support four distinct resonance conditions.

Potential for isotope-selective control of nuclear polarization.

Abstract

We investigate the electric manipulation of a single electron spin in a single gate-defined quantum dot. We observe that so-far neglected differences between the hyperfine and spin-orbit mediated electric dipole spin resonance conditions have important consequences at high magnetic fields. In experiments using adiabatic rapid passage to invert the electron spin, we observe an unusually wide and asymmetric response as a function of magnetic field. Simulations support the interpretation of the lineshape in terms of four different resonance conditions. These findings may lead to isotope-selective control of dynamic nuclear polarization in quantum dots.