Quantum coherence induces pulse shape modification in a semiconductor optical amplifier at room temperature.
Quantum coherence induces pulse shape modification in a semiconductor optical amplifier at room temperature.
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DOI：
10.1038/ncomms3953
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发表时间：
2013
影响因子：
16.6
通讯作者：
Woggon, Ulrike
中科院分区：
文献类型：
--
作者：
Kolarczik, Mirco;Owschimikow, Nina;Korn, Julian;Lingnau, Benjamin;Kaptan, Yuecel;Bimberg, Dieter;Scholl, Eckehard;Luedge, Kathy;Woggon, Ulrike
光-物质相互作用中的相干性是用光来控制物质系统量子态的必要因素。相干效应与保持在低温下的孤立系统密切相关。在凝聚态环境中，特别是在高温下，极快的消相可能在比激光激发脉冲短的时间尺度上消除材料中的所有相干信息。在这里，我们展示了半导体量子点系综，即使在存在超快消相的情况下，对于适当设计的凝聚态系统，量子相干效应足够强大，可以在室温下观察到。我们的结论是基于对超快激光脉冲在通过半导体量子点放大器时所经历的整形的分析。我们发现这种脉冲修饰包含相干光物质相互作用的特征，并且可以通过电注入调节量子点的数量来控制。量子相干效应通常只在低温下可见，在低温下，消相时间不会太短。这里Kolarczik等人表明，即使在室温下，超快激光脉冲通过量子点的重塑也会出现量子相干效应。
Coherence in light–matter interaction is a necessary ingredient if light is used to control the quantum state of a material system. Coherent effects are firmly associated with isolated systems kept at low temperature. The exceedingly fast dephasing in condensed matter environments, in particular at elevated temperatures, may well erase all coherent information in the material at timescales shorter than a laser excitation pulse. Here we show for an ensemble of semiconductor quantum dots that even in the presence of ultrafast dephasing, for suitably designed condensed matter systems quantum-coherent effects are robust enough to be observable at room temperature. Our conclusions are based on an analysis of the reshaping an ultrafast laser pulse undergoes on propagation through a semiconductor quantum dot amplifier. We show that this pulse modification contains the signature of coherent light–matter interaction and can be controlled by adjusting the population of the quantum dots via electrical injection. Quantum coherence effects are often only visible at low temperatures, where dephasing times are not too short. Here Kolarczik et al. show that quantum coherence effects can appear in the reshaping of ultrafast laser pulses passing through quantum dots even at room temperature.
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