%0 Journal Article
%A Heisterkamp, F.
%A Greilich, A.
%A Zhukov, E. A.
%A Kirstein, E.
%A Kazimierczuk, T.
%A Korenev, V. L.
%A Yugova, I. A.
%A Yakovlev, D. R.
%A Pawlis, A.
%A Bayer, M.
%T Inhomogeneous nuclear spin polarization induced by helicity-modulated optical excitation of fluorine-bound electron spins in ZnSe
%J Physical review / B
%V 92
%N 24
%@ 1098-0121
%C College Park, Md.
%I APS
%M FZJ-2016-02182
%P 245441
%D 2015
%X Optically induced nuclear spin polarization in a fluorine-doped ZnSe epilayer is studied by time-resolved Kerr rotation using resonant excitation of donor-bound excitons. Excitation with helicity-modulated laser pulses results in a transverse nuclear spin polarization, which is detected as a change of the Larmor precession frequency of the donor-bound electron spins. The frequency shift in dependence on the transverse magnetic field exhibits a pronounced dispersion-like shape with resonances at the fields of nuclear magnetic resonance of the constituent zinc and selenium isotopes. It is studied as a function of external parameters, particularly of constant and radio frequency external magnetic fields. The width of the resonance and its shape indicate a strong spatial inhomogeneity of the nuclear spin polarization in the vicinity of a fluorine donor. A mechanism of optically induced nuclear spin polarization is suggested based on the concept of resonant nuclear spin cooling driven by the inhomogeneous Knight field of the donor-bound electron.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000367378900017
%R 10.1103/PhysRevB.92.245441
%U https://juser.fz-juelich.de/record/807764