請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76562
標題: | 具有自旋軌道交互作用之鏈環的自旋電導 Spin-Dependent Conductance of a Chain of Rings with Spin-Orbit Interaction |
作者: | Jin-Ting Li 李俊廷 |
指導教授: | 薛文証 |
關鍵字: | 介觀環,自旋軌道交互作用,量子干涉,AC效應,對稱週期性結構, mesoscopic ring,spin orbit interaction,quantum interference,AC effect,symmetric periodic structure, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 本文主旨是在探討介觀環在不同電場的自旋軌道交互作用下所出現的量子干涉現象,並考慮在絕對零度以及有限溫度下,週期陣列結構與對稱週期陣列結構的自旋電導特性,在電場的自旋軌道交互作用下,能夠產生不同方向的自旋電導。本研究使用了一維介觀環模型以及轉移矩陣的方式建構出在複數介觀環中傳輸的自旋電導的基本概念。透過對不同陣列結構的介觀環的參數分析,包含了如二元週期陣列、對稱週期陣列等變化,並探討複數介觀環中的自旋電導及Q factor大小的影響。研究結果顯示當對稱週期陣列結構的環數增加時,共振峰的Q factor也會指數地增加。在相同的環數下,對稱週期陣列的自旋電子濾波器其最大Q factor遠大於週期陣列及其他的結構。此外,也探討在有限溫度下,陣列結構環的自旋電導特性會如何受溫度影響,提供了在不同溫度時的結果。 The quantum interference phenomena of mesoscopic rings with spin orbit interaction under electric fields are studied. Under the condition of absolutely-zero temperature, spin-dependent conductance values of multiple directions are induced by spin orbit interaction of electric field in periodic array structure and symmetric periodic array structure. Mentioned phenomena can be useful in spin electron filter application. In this study, one-dimensional mesoscopic ring model and transfer matrix are used to construct the basic concept of spin-dependent conductance in multiple mesoscopic rings. According to analysis of the mesoscopic rings in different array structures, such as binary periodic arrays and symmetric periodic arrays, the influences of spin-dependent conductance and Q factor in the multiple mesoscopic rings is discussed. The results show that the Q factor of the resonance peaks increase exponentially when the number of rings increases in the symmetric periodic array structure. For the spin electron filter, the maximum Q factor in symmetric periodic array is much larger than the one in any other structures with same ring number. In addition, the relationship between the spin-dependent conductance characteristics of arrayed-ring structure and the variation of temperatures is also presented. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76562 |
DOI: | 10.6342/NTU201702158 |
全文授權: | 未授權 |
顯示於系所單位: | 工程科學及海洋工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-106-R04525047-1.pdf 目前未授權公開取用 | 3.11 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。