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 (7)

• Stimulated and spontaneous optical generation of electron spin coherence in charged GaAs quantum dots
• Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron
• 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 (4)

• Nuclear Spins in Nanostructures
• Optically monitored nuclear spin dynamics in individual GaAs quantum dots grown by droplet epitaxy
• Temperature induced spin coherence dissipation in quantum dots
• Hyperfine interaction in InAs/GaAs self-assembled quantum dots : dynamical nuclear polarization versus spin relaxation