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理學院
物理學系
學位論文
學位論文
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http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/73905
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search.filters.author.Chang-Hao Kuo
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search.filters.author.郭昌昊
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search.filters.subject.Berry curvature
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search.filters.subject.Berry phase
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search.filters.subject.deformation crystal
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search.filters.subject.Laguerre-Gaussian wave
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search.filters.subject.semiclassical dynamics
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Berry相位和半古典動力學
(
2009
)
郭昌昊
;
Chang-Hao Kuo
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我們對晶格內的電子波包加上緩慢而平滑的微擾,並研究它的半古典動力學。我們推導出能量的一階梯度修正項,以及包含了Berry 相位影響下的半古典動力學和量子化條件。 第一個工作是研究晶格變形下的微擾,並探討Berry相位在Lagrangian內如何讓電子波包追隨晶格軌跡,晶格軌跡是半古典運動方程(波包速度和半古典作用力)中新形式的修正項。具有剪應變的晶格內,晶格軌跡會造成波包的橫向位移。 第二個工作是考慮具有渦旋態的半古典波包,這種波包在傳播方向呈現螺線形的波前,並具有軌道角動量 。我們發現磁單極形式的Berry曲率出現在動量空間裡,提供橫向位移的要素。在電場裡,這種波包的行為像是具有自旋m光子。在磁場中,將會出現Zeeman效應,它連結到更複雜的力學結構。
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