Nonequilibrium nuclear-electron spin dynamics in semiconductor quantum dots

Abstract

We study the spin dynamics in charged quantum dots in the situation where the resident electron is coupled to only about 200 nuclear spins and where the electron spin splitting induced by the Overhauser field does not exceed markedly the spectral broadening. The formation of a dynamical nuclear polarization as well as its subsequent decay by the dipole-dipole interaction is directly resolved in time. Because not limited by intrinsic nonlinearities, almost complete nuclear polarization is achieved, even at elevated temperatures. The data suggest a nonequilibrium mode of nuclear polarization, distinctly different from the spin temperature concept exploited on bulk semiconductors

5 pages, 4 figures

References in corpus (10)

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• Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots
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• Optical probing of spin fluctuations of a single magnetic atom
• Electron-nuclei spin dynamics in II-VI semiconductor quantum dots
• The Knight field and the local nuclear dipole-dipole field in an (In,Ga)As quantum dot ensemble
• Direct measurement of hyperfine shifts and radiofrequency manipulation of the nuclear spins in individual CdTe/ZnTe quantum dots
• Multistability and spin diffusion enhanced lifetimes in dynamic nuclear polarization in a double quantum dot
• Measurements of a fast nuclear spin dynamics in a single InAs quantum dot with positively charged exciton
• Manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot