偏振拉曼光譜已經被應用在測量二維材料上，包括石墨稀與過渡金屬二硫化鉬，尤其是使用線偏振和圓偏振光為激發光線。量測不同溫度下的二硫化鉬受不同偏振入射光影響的拉曼張量，我們可以知道聲子振動模式是如何表現其偏振態。在本實驗中，利用紅光共振激發變溫下的二硫化鉬，結果顯示，在低溫狀態下，線偏振的入射光激發時，面內振動(E')和面外振動(A_1')模式表現出線偏振的散射光，b mode則是呈現非各向同性(anisotropic)，隨著溫度的上升，E' 、A_1'仍維持在線偏振的散射光，而b mode則漸漸改變成線偏振的散射光；圓偏振的入射光激發時，低溫狀態的E'和A_1'模態呈現出旋向守恆(helicity-conserve)，b mode 則是表現出旋向轉換(helicity-exchange)，隨著溫度的上升，E' 、A_1'仍維持旋向守恆，但b mode會漸漸變成旋向守恆。
實驗結果顯示了b mode的獨特性，因此我們引用了一些電子-聲子耦合如何影響拉曼強度的偏振態有關的論文，來解釋這個特殊的現象，同時深入探討層狀二維材料的聲子與光子之間的交互作用，以便提供未來先進材料應用更多重要的基礎與應用。

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