Measurements of a fast nuclear spin dynamics in a single InAs quantum dot with positively charged exciton
arXiv:1201.1123 · doi:10.1209/0295-5075/98/17007
Abstract
By using highly time-resolved spectroscopy with an alternative σ+/σ - laser pulse modulation technique, we are able to measure the fast buildup and decay times of the dynamical nuclear spin polarization (DNSP) at 5 K for a single InAs quantum dot (QD) with positively charged exciton. It is shown that the nuclear dipole-dipole interaction can efficiently depolarize DNSP with a typical time constant of 500 μs in the absence of external magnetic field. By using an external field of 8 mT to suppress the nuclear dipolar interaction, the decay time turns to be mainly induced by interaction with unpaired electron and extends to about 5 ms. In addition, it is found that the time constant of hole-induced depolarization of nuclear spin is about 112 ms.
5 pages, 3 figures
References in corpus (12)
- Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
- Hole - Nuclear Spin Interaction in 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
- Hybridization and spin decoherence in heavy-hole quantum dots
- Efficient dynamical nuclear polarization in quantum dots: Temperature dependence
- Electron-nuclear dynamics in a quantum dot under non-unitary electron control
- Full coherent control of nuclear spins in an optically pumped single quantum dot
- Nonequilibrium nuclear-electron spin dynamics in semiconductor quantum dots
- Controlling the Interaction of Electron and Nuclear Spins in a Tunnel-Coupled Quantum Dot