Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots

Abstract

The optically induced polarization of localized electron spins in an ensemble of quantum dots (QDs) dephases due to the interaction with the surrounding nuclear spins. Despite this dephasing, the spins in the QDs can be controlled to respond coherently by applying periodic laser pulses, leading to a revival of the spin polarization before each pulse. This effect, known as spin mode locking, strongly depends on an emerging selection of certain polarizations of the nuclear spin bath which is driven to a steady state far from equilibrium. We investigate the influence of the nuclear composition in In${}_x$Ga${}_{1-x}$As QDs on this nonequilibrium behavior and demonstrate that nuclear magnetic resonances (NMR) appear as very sharp minima in the magnetic field dependence of the revival amplitude. This suggests a novel kind of NMR spectroscopy.

7 pages including 4 figures; 4 pages supplement including 3 figures

References in corpus (8)

• Nuclear spin physics in quantum dots: an optical investigation
• Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
• Quantum Interface of an Electron and a Nuclear Ensemble
• Nuclear Spins in Nanostructures
• Pump-Probe Faraday Rotation and Ellipticity in an Ensemble of Singly Charged Quantum Dots
• From quantum-mechanical to classical dynamics in the central-spin model
• Non-equilibrium nuclear spin distribution function in quantum dots subject to periodic pulses
• Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots

Cited by in corpus (4)

• Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei
• Resonant spin amplification in Faraday geometry
• Quantifying electron-nuclear spin entanglement dynamics in central-spin systems using one-tangles
• Influence of quadrupolar interaction on NMR spectroscopy