量子點分子之量子干涉效應對傳輸及熱電特性的影響

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姓名

陳建宏(Jian-hong Chen) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

量子點分子之量子干涉效應對傳輸及熱電特性的影響
(Quantum interference effects on the transport and thermoelectric properties of quantum dot molecules)

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摘要(中)

本論文利用 tight-binding 模型來研究分析三角型的量子點分子及對稱四角型量子點分子之傳輸。借由凱帝旭格林函數(Keldysh-Green`s function )的技巧可以得出系統中的電導值以及西貝克係數。我們將討論量子干涉效應對電導及西貝克係數(Seebeckcoefficient)的影響。此種量子點分子系統有提供兩個傳導路徑允許電子從左電極到右電極，所以具備了產生量子干涉的條件。利用閘極電位來控制量子點的能階進而達到控制量子點的耦合躍遷強度(Hopping strength)，因而可以檢測量子干涉效應。由於我們忽略了量子點間的庫倫作用力，所以結果不適用在量子點有多電子佔據的情況。

摘要(英)

The charge of triangular and square quantum dot (QD) molecules (QDMs) is studied by using tight-binding model. The electrical conductance and Seebeck coefficient of QDMs are calculated by Keldysh-Green`s function method. Due to two paths, the quantum interference (QI) effect arising from the coherent tunnelingbetween QDs can be observed. We use the longdistance coherent tunneling mechanism to manipulate QI and examine the effect of QI on the thermoelectric coefficients of QDMs connected to metallic electrodes. Because we have ignored electron Coulomb interactions, our results are limited to the case of QDMs energy levels above the Fermi energy of electrodes.

關鍵字(中)

★ 量子干涉效應

關鍵字(英)

★ Quantum interference effect
★ Seebeck effect

論文目次

摘要.............................................................................................................................I
Abstract..........................................................................................................................II
致謝...............................................................................................................................III
目錄...............................................................................................................................IV
圖目錄...........................................................................................................................VI
第一章導論 .................................................................................................................1
1-1 前言 .................................................................................................................1
1-2 歷史簡介 .........................................................................................................2
1.3 研究動機 .........................................................................................................5
第二章系統模型與公式 .............................................................................................7
2-1 系統模型簡介 ................................................................................................7
2-2 系統模型公式 ................................................................................................8
第三章三顆量子點分子系統傳輸及熱電特性分析 .............................................15
3-1 量子點分子結構的共振能量 ......................................................................15
3-2 熱電係數 ......................................................................................................17
3-3 量子干涉效應 ..............................................................................................22
第四章四顆量子點分子系統傳輸及熱電特性分析 .............................................28
4-1 量子點分子結構的共振能量 ......................................................................28
4-2 量子干涉效應 ..............................................................................................29
第五章結論 ...............................................................................................................33
參考文獻......................................................................................................................34

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指導教授

郭明庭(Ming-Ting Kuo)

審核日期

2015-7-14

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