摘要
当入射光的光子能量接近Hg1 -xCdxTe的E0 +Δ0 时 ,发现了Hg1 -xCdxTe的共振拉曼散射 ,观察到了“禁戒”共振增强拉曼散射 ,同时也观察到了二级共振拉曼散射 .分析了非共振条件下能在样品的 (10 0 )面观察到微弱的“禁戒”TO2 模以及在共振条件下“禁戒”TO2 模大大增强的原因 .通过分析 ,发现由双LO声子引起的二级共振拉曼散射主要由带内的Fr hlich相互作用造成的 .
When the photon energy of an incident light is close to E-0 + Delta (0) of Hg1-xCdxTe, we observe the resonant Raman scattering, 'forbidden' resonant enhancement Raman scattering and the second-order resonant Raman scattering. We have analyzed the reason why we can observe the weak 'forbidden' TO2 mode from the principal (100) face of Hg1-xCdxTe in the case of no resonant scattering; and also analyzed the reason why the 'forbidden' TO2 mode from the principal (100) face of Hg1-xCdxTe increases significantly in the case of no resonant scattering. According to our analysis, we find that the second-order resonant Raman scattering by two LO phonons is caused largely by the interband Frohlich interaction.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第5期964-967,共4页
Acta Physica Sinica
基金
昆明理工大学校立基金 (批准号 :980 10 )&&
