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Paraexcitons of Cu_2O confined by a strain trap and high magnetic fields

机译:受应变陷阱和高磁场限制的Cu_2O对激子

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摘要

Spectrally and spatially resolved measurements of yellow 1S orthoexcitons and paraexcitons of Cu_2O in strain-induced traps are presented. Trap depths up to 31 meV for orthoexcitons and 23 meV for paraexcitons are achieved. In addition, a magnetic field up to 10 T is applied. With a theoretical model taking into account the strain- and magnetic-field-induced mixing of 1S yellow and green excitons, the experimental data of trap-depth-dependent and magnetic-field-dependent shifts can be explained. Furthermore, the polarization dependence of the emission of trapped paraexcitons is investigated. Spatially resolved, an intensity-dependent splitting of the luminescence polarized parallel to the symmetry axis of the strain trap is observed. Finally, phonon replica of trapped orthoexcitons and paraexcitons in a magnetic field are presented, which allow us to map a large range of exciton wave vectors.
机译:提出了光谱和空间分辨测量应变诱导陷阱中的黄色1S正激子和Cu_2O的正激子。对于正激子,陷阱深度可达31 meV,对副激子,陷阱深度可达23 meV。此外,施加了高达10 T的磁场。利用理论模型考虑了应变和磁场引起的1S黄色和绿色激子的混合,可以解释陷阱深度相关和磁场相关位移的实验数据。此外,研究了捕获的超激子发射的偏振依赖性。在空间上分辨,观察到平行于应变阱的对称轴偏振的发光强度的分裂。最后,给出了在磁场中捕获的正激子和副激子的声子复制品,这使我们能够绘制大范围的激子波矢量。

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