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报道用分子束外延(MBE)技术生长的x=0.4,0.8的高组分稀磁半导体Cd1-xMnxTe/CdTe超晶格低温和室温荧光谱研究结果.基态激子跃迁能级荧光谱实验结果显示高组分超晶格中具有高量子效率和高质量光发射.对激子能级随温度的变化进行了详细研究,给出激子跃迁能量的温度系数.激子能级线型的展宽随温度变化关系可用激子-纵向光学声子耦合模型解释.与光调制反射谱实验结果进行了比较. 相似文献
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Si/Ge应变层超晶格的椭偏光谱 总被引:2,自引:0,他引:2
测量了几种不同组分的(Si)M/(Ge)N应变超晶格材料的椭偏光谱(2.0~5.0eV),并得到了其介电函数谱;应用介电函数的临界点理论,研究了(Si)M/(Ge)N应变超晶格材料的光学性质。发现短周期Si/Ge应变超晶格除了具有明显的E1和E2带间跃迁外,还存在与应力和超晶格能带的折迭效应有关的跃迁峰,其能量分别位于2.3~3.0eV和3.3~4.0eV范围内 相似文献
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STRUCTURE STUDY OF MODULATION-DOPED Cd1-xMnxTe: In/CdTe STRAINED LAYER MULTIPLE QUANTUM WELLS 下载免费PDF全文
The photomodulated reflectivity (PR) spectroscopy of modulation-doped diluted mag-netic semiconductor Cd1-xMnxTe: In/CdTe multiple quantum wells has been measured at 20-300K. Several spectral features associated with intersubband transitions have been found. The band structure of Cd1-xMnxTe: In/CdTe has been calculated by the Hartree self-consistent method. The results show that the theory is in agreement with experiments. In addition, an abnormal transition intensity ratio of 22H (the second heavy hole subband to the second electroa subband) to 11H (the first heavy hole subband to the first electron subband) caused by electron filled effect has been reported. At low temperature, a feature associated with Fermi level is observed, which has not been reported before. 相似文献
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《Solid State Communications》1986,60(7):621-624
We report a.c. susceptibility measurements in the diluted magnetic semiconductor Cd1-xMnxTe for x = 0.45 and 0.55 between 10 Hz and 6 MHz. The experimental data are interpreted in terms of dynamic scaling laws with a transition temperature Tc consistent with the static results. 相似文献
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本文报道用分子束外延技术生长的Cd1-xMnxTe/Cd1-yMnyTe超晶格样品在80K下的光调制反射谱实验结果,观测到11H,22H,33H和11L等激子跃迁结构。计及晶格失配导致的应力效应,对子能级结构进行了理论计算。 相似文献
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《Superlattices and Microstructures》1993,14(4):261
We have investigated the magnetic and photomagnetic properties of microcrystalline Cd1-xMnxTe prepared by rf sputtering. Magnetization measurements were carried out using an rf SQUID magnetometer in the temperature range of 1.8 to 300 K at various magnetic fields up to 5.5 T. For temperatures above 40 K, the sample showed Curie-Weiss behaviour with a Curie temperature indicating predominantly antiferromagnetic interactions. A spin-glass phase transition was also observed. Photomagnetization measurements were performed using a fibre-optic system. The light was shone onto the sample utilizing an optical fibre and the subsequent change in the magnetization was sensed by the SQUID. Photo-induced magnetization was observed when the sample was illuminated by unpolarized light. Our results enable qualitative and quantitative conclusions to be drawn on the magnetic behaviour and the interplay between optical and magnetic properties of the diluted magnetic microcrystalline semiconductors.PACS: 68.55.Gi; 75.50.Pp. 相似文献
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《Superlattices and Microstructures》1994,15(4):475-478
The paper reports on the influence of a magnetic confinement on the formation of the spin glass phase in superlattices, and on the antiferromagnetic phase transition in zinc-blende MnTe. The effect of interface mixing on the magnetic properties is also discussed. 相似文献
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