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題 名 | Transition Energy Eo and Spin-orbital Splitting △₁ for A Series of Ga₁-xAlxAs Alloys=砷化鋁鎵合金之遷移能量Eo及自旋﹣﹣軌道分裂△ |
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作 者 | 朱惠美; 謝振哲; | 書刊名 | 中原學報 |
卷 期 | 18 1989.12[民78.12] |
頁 次 | 頁23-31 |
分類號 | 337.472 |
關鍵詞 | 分裂; 自旋; 軌道; 砷化鋁鎵合金; 遷移能量; |
語 文 | 英文(English) |
中文摘要 | 以一般介電(質)模型方法與經驗關係式應用於砷化鎵—砷化鋁合金系列之最低直接和較高間接能隙 E₀,E₀+△₀, E₁及E₁+△₁能量值的計算,其理論計算是基於適當的假設即所有能隙E能量約具有與其組成成份x成二次方形式的表示式,E(x)=A+Bx+Cx²。我們將注意力集中於上式所提之首要參數C上,該參數C藉由一般介電(質)模型方法與經驗關係式來估計之,其中經驗關係式為C=ξE□,此處ξ約為0.3eV³/²月而E0m為合金端點組成份子,即砷化鎵—和砷化鋁二化合物之E的平均值。 計算所得結果與經由電場調制反射係數量測(EER)法所得實驗數據比較之,發現該二種方法其計算結果與實驗值非常吻合。 |
英文摘要 | The lowest direct and higher indirect band gaps, E₀, E₀+△₀,E1 and E₁+△₁of a series of GaAs-AlAs alloys were calculated. The theoretical calculations are made suitable assuming that all band gaps E energy have an approximately quadratic form which dependence on alloy concentration x, i.e., E(x)=A+Bx+Cx². And we concentrated on estimating the bowing paramete C in mentioned equation, by using an ordinary dielectric model method and by using an empirical relation C=ξE□, where ξ is a constant of value about 0.3 eV³/², and Eom is the mean value of E for the two compounds GaAs and AIAs concerned. The calculated results are compared to experiment by electroreflectance method and were found that, the both methods show good agreement with experiment. |
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