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Femtosecond photocurrents by the Dresselhaus bulk spin-galvanic effect in an inversion-asymmetric ferromagnet
Junwei Tong, Zdenek Kaspar, Afnan Alostaz +18
We study ultrafast photocurrents in thin films of a model ferromagnetic metal with broken bulk inversion symmetry, the half-metallic Heusler compound NiMnSb, following excitation w…
Removal of GaAs growth substrates from II-VI semiconductor heterostructures
S. Bieker, P. Hartmann, T. Kießling +5
We report on a process that enables the removal of II-VI semiconductor epilayers from their GaAs growth substrate and their subsequent transfer to arbitrary host environments. The…
Non-thermal photocoercivity effect in a ferromagnetic semiconductor
G. V. Astakhov, H. Hoffmann, V. L. Korenev +7
We report a photoinduced change of the coercive field, i.e., a photocoercivity effect (PCE), under very low intensity illumination of a low-doped (Ga,Mn)As ferromagnetic semiconduc…
Suppression of electron spin relaxation in Mn-doped GaAs
G. V. Astakhov, R. I. Dzhioev, K. V. Kavokin +7
We report a surprisingly long spin relaxation time of electrons in Mn-doped p-GaAs. The spin relaxation time scales with the optical pumping and increases from 12 ns in the dark to…
Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique
H. Hoffmann, G. V. Astakhov, T. Kiessling +5
We report on optical spin pumping of modulation electrons in CdTe-based quantum wells with low intrinsic electron density (by 10^10 cm^{-2}). Under continuous wave excitation, we r…
Anomalous in-plane magneto-optical anisotropy of self-assembled quantum dots
T. Kiessling, A. V. Platonov, G. V. Astakhov +6
We report on a complex nontrivial behavior of the optical anisotropy of quantum dots that is induced by a magnetic field in the plane of the sample. We find that the optical axis e…
Quantum-dot-based optical polarization conversion
G. V. Astakhov, T. Kiessling, A. V. Platonov +6
We report circular-to-linear and linear-to-circular conversion of optical polarization by semiconductor quantum dots. The polarization conversion occurs under continuous wave excit…