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首页> 外文会议>Conference on Ultrafast Phenomena in Semiconductors and Nanostructure Materials; 20080120-23; San Jose,CA(US) >Four-wave mixing spectroscopy of ultraviolet excitons in strained GaN
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Four-wave mixing spectroscopy of ultraviolet excitons in strained GaN

机译：应变GaN中紫外激子的四波混合光谱

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摘要

We perform degenerate four-wave-mixing (FWM) studies of GaN excitons especially for an understanding of the strain-fields in the heteroepitaxial films. The shifts of exciton energies and their beating oscillation variations highlight the biaxial strain, allowing for a precise determination of the strain parameters. The uniaxial strain field can be characterized by the polarization dependence of FWM, which shows distinct polarizations and energy variations depending on the sample and its position. The minimum changes of the polarized FWM intensity and exchange energy splittings correspond to a uniaxial strain of 5.0 × 10~(-5), which currently gives a lower resolution limit of this technique and is comparable with that of conventional X-ray diffraction. In the time-evolutions, we investigate the strain effects on the phase of the quantum beats (QBs), giving insight into the excitons interactions. By using time-resolved FWM, difference between two-types of exciton transitions is identified. In addition, coherent manipulations of QBs are successfully realized in the FWM with a Michelson interferometer.
机译：我们进行GaN激子的简并四波混合（FWM）研究，特别是为了了解异质外延膜中的应变场。激子能量的移动及其跳动的振荡变化突出了双轴应变，从而可以精确确定应变参数。单轴应变场可以通过FWM的偏振相关性来表征，FWM的偏振相关性根据样品及其位置显示出明显的偏振和能量变化。偏振FWM强度和交换能量分裂的最小变化对应于5.0×10〜（-5）的单轴应变，目前该技术的分辨率较低，可与常规X射线衍射相比。在时间演化中，我们研究了应变对量子搏动（QBs）相位的影响，从而深入了解了激子相互作用。通过使用时间分辨的FWM，可以识别两种类型的激子跃迁之间的差异。此外，借助迈克尔逊干涉仪在FWM中成功实现了QB的相干操作。

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