Efficient dynamical nuclear polarization in quantum dots: Temperature dependence

Abstract

We investigate in micro-photoluminescence experiments the dynamical nuclear polarization in individual InGaAs quantum dots. Experiments carried out in an applied magnetic field of 2T show that the nuclear polarization achieved through the optical pumping of electron spins is increasing with the sample temperature between 2K and 55K, reaching a maximum of about 50%. Analysing the dependence of the Overhauser shift on the spin polarization of the optically injected electron as a function of temperature enables us to identify the main reasons for this increase.

5 pages, 3 figures

References in corpus (13)

• Low-temperature spin relaxation in n-type GaAs
• Stimulated and spontaneous optical generation of electron spin coherence in charged GaAs quantum dots
• Long-lived memory for mesoscopic quantum bits
• Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots
• Nuclear spin state narrowing via gate--controlled Rabi oscillations in a double quantum dot
• Nuclear Spin Switch in Semiconductor Quantum Dots
• Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron
• Dynamic nuclear polarization of a single charge-tunable InAs/GaAs quantum dot
• Bistability of the Nuclear Polarisation created through optical pumping in InGaAs Quantum Dots
• Nonlinear dynamics of quantum dot nuclear spins
• Stabilizing effect of nuclear quadrupole interaction on the polarization of electron-nuclear spin system in a quantum dot
• Quantum Description of Nuclear Spin Cooling in a Quantum Dot
• Nonequilibrium nuclear-electron spin dynamics in semiconductor quantum dots

Cited by in corpus (29)

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• Nuclear Spins in Nanostructures
• Pumping of nuclear spins by the optical solid effect in a quantum dot
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• Quadrupolar spectra of nuclear spins in strained InGaAs quantum dots
• Improving a solid-state qubit through an engineered mesoscopic environment
• Optically monitored nuclear spin dynamics in individual GaAs quantum dots grown by droplet epitaxy
• Integrability and dark states in an anisotropic central spin model
• Theoretical study of nuclear spin polarization and depolarization in self-assembled quantum dots
• Polarization freezing of 10000 optically-cooled nuclear spins by coupling to a single electron
• Overhauser effect in individual InP/GaInP dots
• Temperature induced spin coherence dissipation in quantum dots
• Long nuclear spin decay times controlled by optical pumping in individual quantum dots
• Shortcuts to Dynamic Polarization
• Electron and nuclear spin properties of the nanohole-filled GaAs/AlGaAs quantum dots
• Hyperfine interaction in InAs/GaAs self-assembled quantum dots : dynamical nuclear polarization versus spin relaxation
• Direct measurement of hyperfine shifts and radiofrequency manipulation of the nuclear spins in individual CdTe/ZnTe quantum dots
• Voltage control of electron-nuclear spin correlation time in a single quantum dot
• Interfacing nuclear spins in quantum dots to cavity or traveling-wave fields
• Many-body singlets by dynamic spin polarization
• Temperature dependence of electron-spin relaxation in a single InAs quantum dot at zero applied magnetic field
• Nuclear spin polarization in a single quantum dot pumped by two laser beams
• High-efficiency optical pumping of nuclear polarization in a GaAs quantum well
• Voltage controlled nuclear polarization switching in a single InGaAs quantum dot
• Third Stable Branch and Tristability of Nuclear Spin Polarization in Single Quantum Dot System
• Electrically tunable dynamic nuclear spin polarization in GaAs quantum dots at zero magnetic field
• Measurements of a fast nuclear spin dynamics in a single InAs quantum dot with positively charged exciton
• Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots