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Dynamic nuclear self-polarization for measurements of nuclear magnetic moments

Koizumi, Mitsuo; Goto, Jun*; Matsuki, Seishi*; Nakamura, Shoji

Dynamic nuclear self-polarization (DYNASP) is a phenomenon that is observed in the III-V semiconductors. When electrons in the valence band of a semiconductor are optically excited to the conduction band, quite large nuclear polarization suddenly occurs below a critical temperature. This phenomenon was theoretically predicted by Dyakonov and Perel. Our recent work predicted that the electrons excited by circularly polarized laser enhance nuclear polarization near the critical temperature. The mechanism of such a large nuclear polarization would be useful for measurements of nuclear magnetic moments of unstable nuclides. However, the experiment on DYNASP can be found only in a conference report. In order to confirm the phenomenon, we have started the study of DYNASP. Preparation of experiments on DYNASP is in progress. In this paper, we describe the present status of the study of nuclear polarization by using DYNASP from the theoretical and experimental aspects.

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