Asymmetric optical nuclear spin pumping in a single uncharged quantum dot

被引：8

作者：

Klotz, F. ^{[1
]}

Jovanov, V. ^{[1
]}

Kierig, J. ^{[1
]}

Clark, E. C. ^{[1
]}

Bichler, M. ^{[1
]}

Abstreiter, G. ^{[1
]}

Brandt, M. S. ^{[1
]}

Finley, J. J. ^{[1
]}

Schwager, H. ^{[2
]}

Giedke, G. ^{[2
]}

机构：

[1] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany

[2] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 12期

关键词：

ELECTRON; NANOSTRUCTURES; POLARIZATION;

D O I：

10.1103/PhysRevB.82.121307

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Highly asymmetric dynamic nuclear spin pumping is observed in a single self-assembled InGaAs quantum dot subject to resonant optical excitation of the neutral exciton transition. A large maximum polarization of 54% is observed and the effect is found to be much stronger upon pumping of the higher energy Zeeman level. Time-resolved measurements allow us to directly monitor the buildup of the nuclear spin polarization in real time and to quantitatively study the dynamics of the process. A strong dependence of the observed dynamic nuclear polarization on the applied magnetic field is found, with resonances in the pumping efficiency observed for particular magnetic fields. We develop a model that accounts for the observed behavior, where the pumping of the nuclear spin system is due to hyperfine-mediated spin-flip transitions between the states of the neutral exciton manifold.

引用

页数：4

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