中大機構典藏-NCU Institutional Repository-提供博碩士論文、考古題、期刊論文、研究計畫等下載:Item 987654321/68757
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 66984/66984 (100%)
造访人次 : 23024547      在线人数 : 389
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/68757


    题名: 串接耦合量子點在線性與非線性響應的傳輸及熱電行為之探討;The study of charge transport and thermoelectrical properties of serially coupled quantum dots in the linear and nonlinear responses
    作者: 李汶洛;Li,Wen-luo
    贡献者: 電機工程學系
    关键词: 量子點;熱電;自旋阻斷;席貝克係數;quantum dot;thermoelectric;spin blockade;Seebeck coefficient
    日期: 2015-07-14
    上传时间: 2015-09-23 14:24:39 (UTC+8)
    出版者: 國立中央大學
    摘要: 本論文探討串接耦合量子點連接金屬電極在線性與非線性響應區域間的傳輸及熱電特性。我們使用延展的哈伯模型和安德森模型來描述串接耦合量子點接面系統之電子總能,並藉由凱帝旭格林函數的技術得到流經串接耦合量子點接面的穿隧電流和熱流。在包利自旋阻斷條件下,我們研究串接耦合量子點的電流整流和負微分電導之行為。除此之外,在線性響應區,我們亦分析電導和席貝克係數。我們觀察到電導的非熱增寬現象和透過席貝克係數的變化可分辨量子點內電子自旋組態,驗證了串接耦合量子點系統可同時作為一個自旋過濾器和低溫電流過濾器。最後,我們討論了以兩端金屬電極溫差來驅動串接耦合量子點接面穿隧電流的機制,並且發現到與量子點能階高低相依的熱電流之非線性傳輸行為。;We theoretically study the charge transport and thermoelectric properties of a serially coupled quantum dots (SCQDs) connected to the metallic electrodes in the linear and nonlinear response regimes by the extended Hubbard model and Anderson model. The charge and heat currents of SCQDs are calculated by the Keldysh-Green function technique. We investigate the current rectification and negative differential conductance of SCQDs under the Pauli spin blockade (PSB) condition in the nonlinear response regime. The nonthermal broadening effect of tunneling current in the PSB process is observed. This demonstrates that SCQDs can act as spin filters and low-temperature current filters simultaneously. In the linear response regime, the electrical conductance and Seebeck coefficient (S) are also analyzed. The temperature-dependent S can reveal the spin configuration by examining the sign change of S. Finally, we have investigated the tunneling current of SCQDs driven by a temperature bias and observed the nonlinear thermal currents which depend on the QD energy levels .
    显示于类别:[電機工程研究所] 博碩士論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    index.html0KbHTML137检视/开启


    在NCUIR中所有的数据项都受到原著作权保护.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈  - 隱私權政策聲明