五個串接耦合量子點之熱電特性與不同量子點數之系統比較

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王增彥(Tseng-Yen Wang) 查詢紙本館藏

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物理學系

論文名稱

五個串接耦合量子點之熱電特性與不同量子點數之系統比較
(Thermoelectric effects of serially coupled five quantum dots connected to metallic electrodes)

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摘要(中)

本論文利用Anderson模型來研究五個串接耦合量子點的系統，並利用凱帝旭格林函數來計算系統的電流，進而算出多體理論線性響應區下系統的電導、Seebeck coefficient、Power factor，透過理論模擬出量子點size fluctuation與position fluctuation以及電極與量子點間tunneling rate對Power factor的影響。我們透過調變鄰近量子點的能階來觀察系統的行為發現long distance coherent tunneling的現象。最後討論系統量子點的數量對熱電係數的效應。

摘要(英)

The thermoelectric properties of coupled five quantum dots (QDs) connected to metallic electrodes are theoretically studied by using the multi-levels of Anderson model. For simplicity, the electrical conductance, Seebeck coefficient and power factor of multiple QDs junction system are calculated in the absence of electron Coulomb interactions. The effects of QD size and position fluctuation on the thermoelectric properties of QD junction system are discussed and analyzed on the basis of long distance coherent tunneling. The thermoelectric behavior of five QDs is similar to that of N=3 in a certain condition.

關鍵字(中)

★ 量子點
★ 熱電

關鍵字(英)

★ quantum dot

論文目次

目錄
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 熱電效應…………………………………………………………………2
1-3 熱電元件的發展…………………………………………………………4
1-4 研究動機…………………………………………………………………5
第二章、系統模型與熱電特性………………………………………………………6
2-1 前言………………………………………………………………………6
2-2 系統模型…………………………………………………………………6
2-3 穿隧電流及熱流…………………………………………………………8
2-4 各項熱電特性的定義與推導……………………………………………9
2-5 物理參數對熱電係數的影響 …………………………………………12
第三章、五個串接耦合量子點的熱電特性…………………………………………16
3-1 前言 ……………………………………………………………………16
3-2 量子點能階與費米能階差所造成的效應 ……………………………16
3-3 量子點大小對熱電特性的影響 ………………………………………22
3-4 量子點間電子跳躍強度對熱電特性的影響 …………………………29
3-5 電極穿隧率對熱電系統的影響 ………………………………………36
第四章、long distance coherent tunneling與量子點數對熱電系統的影響 ……………………………………………………………………………………40
4-1 前言 ……………………………………………………………………40
4-2 long distance coherent tunneling ………………………………40
4-3 量子點數對熱電系統的影響 …………………………………………46
第五章、結論…………………………………………………………………………54
附錄 …………………………………………………………………………………55
參考文獻 ……………………………………………………………………………62

參考文獻

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指導教授

郭明庭

審核日期

2014-6-30

推文