Volume 133, Number 5, March 2021
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 April 2021|
Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots
Condensed Matter Theory, TU Dortmund University - D-44221 Dortmund, Germany
Received: 7 December 2020
Accepted: 2 February 2021
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 InxGaAs 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.
PACS: 78.67.Hc – Quantum dots / 78.47.-p – Spectroscopy of solid state dynamics / 76.60.-k – Nuclear magnetic resonance and relaxation
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