Inhomogeneous nuclear spin polarization induced by helicity-modulated optical excitation of fluorine-bound electron spins in ZnSe

Heisterkamp, F.; Greilich, A.; Korenev, V. L.; Kazimierczuk, T.; Kirstein, E.; Zhukov, E. A.; Yugova, I. A.; Bayer, M.; Yakovlev, D. R.; Pawlis, A.

doi:10.1103/PhysRevB.92.245441

Journal Article

FZJ-2016-02182

Inhomogeneous nuclear spin polarization induced by helicity-modulated optical excitation of fluorine-bound electron spins in ZnSe

Heisterkamp, F. ; Greilich, A. ; Zhukov, E. A. ; Kirstein, E. ; Kazimierczuk, T. (Corresponding author) ; Korenev, V. L. ; Yugova, I. A. ; Yakovlev, D. R. ; Pawlis, A.FZJ* ; Bayer, M.

2015
APS College Park, Md.

Physical review / B 92(24), 245441 (2015) [10.1103/PhysRevB.92.245441]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10153 doi:10.1103/PhysRevB.92.245441

Abstract: 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.

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