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Valleytronics

Valleytronics is a portmanteau combining the terms valley and electronics. The term refers to the technology of control over the valley degree of… 
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Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
2018
2018
We propose a scheme to trap and filter electrons, valley dependently, on a scale beyond the diffraction limit, in a gapped Dirac… 
2017
2017
Due to its strong bonds graphene can stretch up to 25% of its original size without breaking. Furthermore, mechanical… 
2017
2017
Two-dimensional (2D) materials have gained increasing attention due to their unique and extraordinary electrical and… 
2017
2017
We adopt the tight-binding mode-matching method to study the strain effect on silicene heterojunctions. It is found that valley… 
2015
2015
In this thesis, we have studied tungsten dichalcogenides (WS2 and WSe2) by means of steady-state µ-photoluminescence (µ-PL) and… 
2014
2014
Electrons in two-dimensional atomic crystals such as few-layer sheets of graphene or transition-metal dichalcogenides carry… 
2011
2011
電子除了基本電荷量以外還帶有自旋。本文把基本電荷量以外,像電子自旋這樣的,其他用來描述電子狀態的量子數或自由度,稱為“同位旋”。而同位旋電子學探討的是,利用這些額外的自由度來設計新功能的元件的可能性。本文第一章提供對後面討論的相關的準備,第二章開始,便討論在准一維電子系統中,磁性雜質伴隨Rashba效應產生的自旋過濾。整個討論使用Tomonaga-Luttinger的理論,而Luttinger理論中常出現的電荷-自旋分離,在我們加入的Rashba效應影響下會被破壞。弱磁性雜質是一個破壞時間反演對稱的散射源。一起考慮這些機制的系統,將會有自旋極化的效果(即產生自旋電流)。本文的第三章提出基於石墨烯其色散關係的valley(能谷)這個新穎自由度而設計出的雙量子點量子位元。石墨烯的色散關係中,包含兩個簡併的能谷。我們的討論還假定了石墨烯在能谷處已經打開了能隙。類似用自旋的singlet和triplet形成自旋對量子位元的想法,我們的設想是利用能谷的singlet和triplet。此外,我們也提出了基於以電壓調變能谷磁矩,來操作此量子位元的方法。基於能谷的量子位元的特性或優點,乃是:a) 容錯的與可以規模化集成的能力,b) 可用電極來進行全電性的操控 和 c) 很長的相干時間,以上皆是建構量子位元時的重要考慮。