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Time resolved magnetic ordering and photo-induced gyrotropy at room temperature in CdMgTe-CdMnTe semiconductor micro-cavities

机译:CdMgTe-CdMnTe半导体微腔在室温下的时间分辨磁有序性和光致旋向性

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摘要

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 photoinduced 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 mu J cm(-2) and effective Mn concentrations of 5 nm(-3); large photo-induced magneto-optic Kerr rotations are also evidenced. (C) 2005 Elsevier Ltd. All rights reserved.
机译:使用皮秒泵和探针时间分辨技术,我们证明了在室温下以强耦合方式工作的Mn掺杂半导体磁光子微腔中的单泵脉冲光诱导的磁有序。纳秒持续时间的磁化归因于通过光生空穴介导并通过限制而增强的锰杂质的磁排序。它与先前的载流子短暂的光诱导自旋取向不同,载流子的短时光诱导自旋取向也由我们的圆偏振泵浦光束技术证明。光生磁通量密度为1 kG,束通量只有几十μJ cm(-2),有效Mn浓度为5 nm(-3)。还证明了大的光致磁光克尔旋转。 (C)2005 Elsevier Ltd.保留所有权利。

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