Dynamic Polarization and Relaxation of 75As Nuclei in Silicon at High Magnetic Field and Low Temperature


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Abstract

We present the results of experiments on dynamic nuclear polarization and relaxation of 75As in silicon crystals. Experiments are performed in strong magnetic fields of 4.6 T and temperatures below 1 K. At these conditions donor electron spins are fully polarized, and the allowed and forbidden electron spin resonance transitions are well resolved. We demonstrate effective nuclear polarization of 75As nuclei via the Overhauser effect on the time scale of several hundred seconds. Excitation of the forbidden transitions leads to a polarization through the solid effect. The relaxation rate of donor nuclei has strong temperature dependence characteristic of Orbach process.

About the authors

J. Järvinen

Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku

Author for correspondence.
Email: jaanja@utu.fi
Finland, Turku, 20014

J. Ahokas

Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku

Email: jaanja@utu.fi
Finland, Turku, 20014

S. Sheludiakov

Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku

Email: jaanja@utu.fi
Finland, Turku, 20014

O. Vainio

Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku

Email: jaanja@utu.fi
Finland, Turku, 20014

D. Zvezdov

Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku; Institute of Physics, Kazan Federal University

Email: jaanja@utu.fi
Finland, Turku, 20014; Kazan, 420008

L. Lehtonen

Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku

Email: jaanja@utu.fi
Finland, Turku, 20014

L. Vlasenko

Ioffe Institute, Russian Academy of Sciences

Email: jaanja@utu.fi
Russian Federation, St. Petersburg, 194021

S. Vasiliev

Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku

Email: jaanja@utu.fi
Finland, Turku, 20014

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