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題 名 | Hydrogenic Impurity States in Quantum-well Wires=量子井線中似氫雜質的能態 |
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作 者 | 石豫臺; | 書刊名 | 建國學報 |
卷 期 | 20 2001.06[民90.06] |
頁 次 | 頁367-374 |
分類號 | 330 |
關鍵詞 | GaAs/Al戓Ga[fec5]As quantum-well wire; 變分法; 砷化鎵/砷化鋁錠量子井線; 似氫雜質; 束縛能; 試探波函數; Binding energies; Hydrogenic impurities; Variational approach; Trial wave function; |
語 文 | 英文(English) |
中文摘要 | 本文以變分法計算在圓柱形砷化鎵╱砷化鋁鎵量子井線內不同位置處的似氫雜質的基能束縛能,所使用的新奇試探波函數可滿足不同量子井線半徑的要求。計算中也考慮了不同的合金成分對束縛能的影響。我們的結果顯示:由於量子井線的侷限作用,雜質的束縛能會隨著線半徑的縮小而增加,但當線半徑趨近於零或很大時,雜質的束縛能則趨近於塊材時的結果。雜質所在的位置和合金成分亦會影響束縛能的大小,當雜質越遠離軸心時,其束縛能越小,而較高的鋁合金成分會使得量子井線有較高的位能障,因而導致較大的雜質束縛能。我們計算的結果相當符合前人的研究成果。 |
英文摘要 | The ground state binding energies of hydrogenic impurities located at different positions inside a cylindrical GaAs/Al�XGa�譽s quantum-well wire are calculated by a variational approach. A novel trial wave function that satisfies the requirement of the exact wave function for large and small wire radius is adopted in the calculation. The effects of different alloy compositions on the binding energies are also taken into account. Our calculated results show that, due to the dimensional confinement, the binding energies are greatly enhanced as the wire radius decreases. However, the binding energies approach those of bulk impurities as the wire radius approaches zero or is very large. The binding energies also depend on impurity position and alloy composition. When impurity position changes from the axis of the wire to the edge of the wire the binding energies decrease. A larger alloy composition x results in higher potential barriers and then induces larger binding energies. Our results agree well with those of the previous works. |
本系統中英文摘要資訊取自各篇刊載內容。