期刊
PHYSICAL REVIEW B
卷 103, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.195311
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资金
- Deutsche Forschungsgemeinschaft through the Collaborative Research Centre [TRR 142]
Optical second harmonic generation (SHG) on excitons was studied in polar ZnO/(Zn,Mg)O quantum wells grown on ZnO and sapphire substrates. SHG signal on exciton resonances was observed in a symmetry-forbidden geometry for light propagation along the c axis of the structure, indicating a possibility of induced signals by symmetry reduction and built-in electric fields.
Optical second harmonic generation (SHG) on excitons is studied in polar ZnO/(Zn,Mg)O quantum wells grown on ZnO and sapphire substrates. We observe SHG signal on exciton resonances in a symmetry-forbidden geometry for light propagation along the c axis of the structure. A symmetry analysis allows us to suggest that the signals are induced by a symmetry reduction with respect to ZnO bulk crystals by the well-barrier interfaces in combination with built-in electric fields due to spontaneous and piezoelectric polarization as well as structural defects.
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