Nuclear magnetization in gallium arsenide quantum dots at zero magnetic field

G. Sallen, S. Kunz, T. Amand, L. Bouet, T. Kuroda, T. Mano, D. Paget, O. Krebs, X. Marie, K. Sakoda and B. Urbaszek ()
Additional contact information
G. Sallen: Université de Toulouse, INSA-CNRS-UPS, LPCNO
S. Kunz: Université de Toulouse, INSA-CNRS-UPS, LPCNO
T. Amand: Université de Toulouse, INSA-CNRS-UPS, LPCNO
L. Bouet: Université de Toulouse, INSA-CNRS-UPS, LPCNO
T. Kuroda: National Institute for Material Science
T. Mano: National Institute for Material Science
D. Paget: LPMC, Ecole Polytechnique, CNRS
O. Krebs: CNRS Laboratoire de Photonique et de Nanostructures
X. Marie: Université de Toulouse, INSA-CNRS-UPS, LPCNO
K. Sakoda: National Institute for Material Science
B. Urbaszek: Université de Toulouse, INSA-CNRS-UPS, LPCNO

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Optical and electrical control of the nuclear spin system allows enhancing the sensitivity of NMR applications and spin-based information storage and processing. Dynamic nuclear polarization in semiconductors is commonly achieved in the presence of a stabilizing external magnetic field. Here we report efficient optical pumping of nuclear spins at zero magnetic field in strain-free GaAs quantum dots. The strong interaction of a single, optically injected electron spin with the nuclear spins acts as a stabilizing, effective magnetic field (Knight field) on the nuclei. We optically tune the Knight field amplitude and direction. In combination with a small transverse magnetic field, we are able to control the longitudinal and transverse components of the nuclear spin polarization in the absence of lattice strain—that is, in dots with strongly reduced static nuclear quadrupole effects, as reproduced by our model calculations.

Date: 2014
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DOI: 10.1038/ncomms4268

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