吸附原子石墨烯系統中能谷和自旋霍爾效應共存現象的研究

Coexistence of valley and spin Hall effects in graphene decorated with adatoms

張先鵬(Zhang, Xian Peng)

指導教授 ： 米格爾

國立清華大學/理學院/物理學系/碩士(2016年)

摘要

我們研究了石墨烯系統中任意分佈的吸附原子的電流響應。我們發現局部的吸附原子如果能誘導自旋軌道耦合并破壞子晶格反演對稱性的話，我們能觀測到能谷和自旋霍爾效應共存現象。我們構造了一個非常簡單的模型去研究這種共存現象，并解釋了最近實驗室上倍受爭議的非局域電信號的物理起源問題。

關鍵字

能谷霍爾效應 ； 自旋霍爾效應

並列摘要

We show that in the presence of random impurities that both break the sub-lattice inversion symmetry and induce spin orbit coupling, graphene can sustain both spin and valley currents. We develop a simple model to investigate the coexistence of the classical spin and valley Hall effects. Our results are relevant for the existing experimental controversy concerning the origin of the non-local signals observed in graphene devices decorated with various types of adsorbates.

並列關鍵字

Valley Hall effect ； Spin Hall effect

參考文獻

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