Shielding of external magnetic field by dynamic nuclear polarization in (In,Ga)As quantum dots
arXiv:2101.04469 · doi:10.1103/PhysRevB.104.075302
Abstract
The dynamics of the coupled electron-nuclear spin system is studied in an ensemble of singly-charged (In,Ga)As/GaAs quantum dots (QDs) using periodic optical excitation at 1 GHz repetition rate. In combination with the electron-nuclei interaction, the highly repetitive excitation allows us to lock the electron spins into magnetic resonance in a transverse external magnetic field. Sweeping the field to higher values, the locking leads to an effective "diamagnetic" response of significant strength due to dynamic nuclear polarization, which shields the QD electrons at least partly from the external field and can even keep the internal magnetic field constant up to 1.3 T field variation. We model the effect through a magnetic field-dependent polarization rate of the nuclei, from which we suggest a strategy for adjusting the nuclear polarization through the detuning between optical excitation and electronic transition, in addition to tuning the magnetic field.
arXiv comment12 pages, 9 figures
References in corpus (25)
- Quantum Computing
- Electron spin relaxation by nuclei in semiconductor quantum dots
- Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
- Deterministic Generation of a Cluster State of Entangled Photons
- Nuclear spin physics in quantum dots: an optical investigation
- Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots
- Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
- Phase-tuned entangled state generation between distant spin qubits
- Confluence of resonant laser excitation and bi-directional quantum dot nuclear spin polarization
- Locking electron spins into magnetic resonance by electron-nuclear feedback
- Quantum Interface of an Electron and a Nuclear Ensemble
- Controlling a mesoscopic spin environment by quantum bit manipulation
- Dynamic nuclear polarization of a single charge-tunable InAs/GaAs quantum dot
- Pump-Probe Faraday Rotation and Ellipticity in an Ensemble of Singly Charged Quantum Dots
- Dynamic nuclear spin polarization in resonant laser spectroscopy of a quantum dot
- Effect of annealing on the hyperfine interaction in InAs/GaAs quantum dots
- Pumping of nuclear spins by the optical solid effect in a quantum dot
- Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots
- Pulsed Nuclear Pumping and Spin Diffusion in a Single Charged Quantum Dot
- Collective quantum memory activated by a driven central spin
- Control of the direction and rate of nuclear spin flips in InAs quantum dots using detuned optical pulse trains
- Multitudes of Stable States in a Periodically Driven Electron-Nuclear Spin System in a Quantum Dot
- A quantum interface between light and nuclear spins in quantum dots
- Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
- Universal nuclear focusing of confined electron spins