2012-04-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/698064摘要：本計畫研究石墨烯/超導體複合系統的量子傳輸現象與二維電子在低溫高磁場下的傳輸效應。石墨烯自從西元2004年首次被成功合成後，引起了世界上非常廣泛的興趣。雖單層石墨烯已被廣泛的研究，石墨烯/超導體複合系統相關的研究在文獻上非常少，我們計畫整合高溫超導體以及石墨烯，並研究其超導電流以及超導電極對量子霍爾態的影響。我們計畫的第二個部分是研究二維電子氣在低溫強磁場下的量子傳輸效應，尤其著重在藍道填充因子為5/2的分數量子霍爾態，選擇研究5/2態的原因是它是目前所知唯一是分母為偶數之分數量子霍爾態，而且它的行為非常像庫柏對。更重要的是5/2態被預測可以用來作量子計算，因此在基礎研究上非常重要。我們預計利用閘極或照光來改變樣品的有效無序來建構5/2狀態的相圖。<br> Abstract: In this project, we plan to study transport in a hybrid graphene/superconductor system and quantum transport in a two-dimensional electron gas in the low-temperature, high-field regime. Since its discovery in 2004, graphens has been attracting a great deal of interest world-wide. Although there is a lot of work done on mono-layer graphene, there is a dearth of study of hybrid superconductor/graphene system. We plan to integrate high temperature superconductors with graphene and study supercurrent through a graphene/high-temperature superconductor and the effects of superconductors on the quantum Hall effect in graphene. In the second part of this project, we plan to study the fractional quantum Hall effect at 5/2. The 5/2 state is extraordinary as it is the only fractional quantum Hall state with an even denomiator and it behaves like the Cooper pairs. Most importantly, it has been suggested that it is possible to utilize the 5/2 state to perform quantum computation. We plan to study the 5/2 state by using a gate or illumination.石墨烯超導體二維電子氣Graphenesuperconductortwo-dimenional electron gas