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Time resolved magnetic ordering and photo-induced gyrotropy at room temperature in CdMgTe-CdMnTe semiconductor micro-cavities |
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| Authors: | S Bahbah R André C Flytzanis |
| Institution: | a Laboratoire Charles Fabry de l'Institut d'Optique, Centre National de la Recherche Scientifique, Université Paris-Sud, Centre Scientifique Paris-Sud, Bât. 503, F-91403 Orsay cedex, France b Laboratoire de Spectrométrie Physique, Centre National de la Recherche Scientifique, Université Joseph Fourier-Grenoble, B.P. 87, F-38402 Saint Martin d'Hères cedex, France c Laboratoire Pierre Aigrain, Centre National de la Recherche Scientifique, Ecole Normale Supérieure, 24 rue Lhomond, F-75231 Paris cedex, France |
| Abstract: | Using a picosecond pump and probe time-resolved technique we evidence a single pump pulse photo-induced magnetic ordering in a Mn-doped semiconductor magneto-photonic microcavity operating in the strong coupling regime at room temperature. This nanosecond duration magnetization is attributed to a magnetic ordering of the Mn-impurities mediated through photo-generated holes and enhanced through the confinement. It is distinct from the preceding short lived photo-induced spin orientation of carriers also evidenced by our technique for circularly polarized pump beams. The photo-generated magnetic flux density amounts to a 1 kG for beam fluences of few tens μJ cm−2 and effective Mn concentrations of 5 nm−3; large photo-induced magneto-optic Kerr rotations are also evidenced. |
| Keywords: | 75 50 Pp 75 75 +a 75 30 Hx 75 30 Et 78 20 Ls 71 36 +c 42 65 &minus k |
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