Hyperfine interaction in InAs/GaAs self-assembled quantum dots : dynamical nuclear polarization versus spin relaxation
arXiv:0904.1548 · doi:10.1016/j.crhy.2008.10.001
Abstract
We report on the influence of hyperfine interaction on the optical orientation of singly charged excitons X+ and X- in self-assembled InAs/GaAs quantum dots. All measurements were carried out on individual quantum dots studied by micro-photoluminescence at low temperature. We show that the hyperfine interaction leads to an effective partial spin relaxation, under 50kHz modulated excitation polarization, which becomes however strongly inhibited under steady optical pumping conditions because of dynamical nuclear polarization. This optically created magnetic-like nuclear field can become very strong (up to ~4 T) when it is generated in the direction opposite to a longitudinally applied field, and exhibits then a bistability regime. This effect is very well described by a theoretical model derived in a perturbative approach, which reveals the key role played by the energy cost of an electron spin flip in the total magnetic field. Eventually, we emphasize the similarities and differences between X+ and X- trions with respect to the hyperfine interaction, which turn out to be in perfect agreement with the theoretical description.
10 pages, 5 figures
References in corpus (14)
- Driven coherent oscillations of a single electron spin in a quantum dot
- Electron spin relaxation by nuclei in semiconductor quantum dots
- Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots
- 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
- Efficient dynamical nuclear polarization in quantum dots: Temperature dependence
- Optical detection of single electron spin resonance in a quantum dot
- Polarization-dependent shift in excitonic Zeeman splitting of self-assembled InAlAs quantum dots
- Light-induced nuclear quadrupolar relaxation in semiconductors
- Precise measurements of electron and hole g-factors of single quantum dots by using nuclear field
Cited by in corpus (11)
- Spin dynamics in semiconductors
- Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
- Nuclear spin physics in quantum dots: an optical investigation
- Magnetic anisotropy of singly Mn-doped InAs/GaAs quantum dots
- Electrical initialization of electron and nuclear spins in a single quantum dot at zero magnetic field
- Voltage control of electron-nuclear spin correlation time in a single quantum dot
- Temperature-dependent broadening of coherent current peaks in InAs double quantum dots
- A solvable quantum model of dynamic nuclear polarization in quantum dots
- Third Stable Branch and Tristability of Nuclear Spin Polarization in Single Quantum Dot System
- P-shell carriers assisted dynamic nuclear spin polarization in single quantum dots at zero external magnetic field
- Direct high resolution resonant Raman scattering measurements of InAs quantum dot dynamic nuclear spin polarization states