頁籤選單縮合
題 名 | Deviations from Quantized Hall Conductivity in Finite 2DEG Samples |
---|---|
作 者 | Bartos,I.; Rosenstein,B.; | 書刊名 | 中原學報 |
卷 期 | 23:3 1995.07[民84.07] |
頁 次 | 頁9-14 |
分類號 | 333.21 |
關鍵詞 | 整數量子霍爾效應; 蘭道能階; 庫柏公式; 量子線; 霍爾導電率; Inteqer quantum hall effect; Landau levels; Kubo formula; Quantum wires; Hall conductivity; |
語 文 | 英文(English) |
中文摘要 | 針對磁場作用下的二維有限電子系統的局部霍爾 導電率和總霍爾導電率,庫柏公式可以用來獲取其 普遍性的表示公式。這些簡單公式可用來定量地研 究偏離其整數值的導電率。霍爾導電率的偏離永遠 是負的。偏離值的大小則與樣品的有技寬度成反比, 而與在費未能階的蘭道分岐散離開係(見(16)式)的 斜率成正比。圍禁屏障的簡單模型,以及最近量于 線的實驗數據與理論的關條亦被引用為倒証。 |
英文摘要 | The Kubo formula is used to obtain general expressions for local and total Hall conductivities in finite two dimensional electron systems under magnetic field. Simple formulas allow to study quantitatively deviations of the conducti vity from integer values. The deviations of the Hall conductivity are always negative. The magnitude is inversely proportional to the effective width of the sample and proportional to the slope of the Landau branch dispersion relation at the Fermi level, eq. (16).Illustrationsfor simple models of the confinement barrier, as well as relation to recent experimental data for quantum wires are given |
本系統中英文摘要資訊取自各篇刊載內容。