文献类型：期刊文献

中文题名：Zigzag边纳米石墨带超导结中的可控O-π相变

英文题名：Controllable O-π transition in a zigzag superconducting graphene - nanoribbon junction

作者：梁奇锋[1,2];余勇[1];王强华[1];董锦明[1]

机构：[1]南京大学物理系固体微结构国家实验室计算凝聚态物理组,南京210093;[2]绍兴文理学院物理系,绍兴312000

年份：2009

期号：2

起止页码：100

中文期刊名：物理

外文期刊名：Physics

收录：CSTPCD、、北大核心2008、北大核心

基金：国家重点基础研究发展计划(批准号:2004CB619004,2006CB921803);国家自然科学基金(批准号:90503012,10874067)资助项目

语种：中文

中文关键词：纳米材料;超导电性;约瑟夫森效应;O-π相变

外文关键词：nanometer materials, superconductivity, Josephson junction,O-π phase transition

中文摘要：文章作者利用实空间格林函数方法研究了超导体-zigzag边纳米石墨带-超导体(SGS)约瑟夫森结中的超导输运行为.结果发现:(1)通过一个外加横向电场可以使该超导结的超流方向发生翻转,即发生超导0-π相变;(2)通过改变纳米石墨带的长度或者其上的门电压,同样也可以使它发生0-π相变.由于可以用外电场方便地控制该超导结0-π相变的发生,使得它有可能在未来的量子计算以及超导电子学中发挥巨大的作用.

外文摘要：The supercurrent in a Josephson junction composed of a zigzag-edged graphene nanoribbon （ZGNR） lying between two superconducting leads [ superconductor-graphene-superconductor （ SGS ） junction ] has been studied by the Green＇s function method. It is found that applying a small transverse electric field can reverse the supercurrent direction, leading to a so - called O-π phase transition. This transition can also happen periodically with a given change in the ZGNR＇s length, and, more importantly, can be easily and electrically controllable by a gate voltage, which is not possible in conventional superconducting π junctions and makes the SGS junction very promising for future application in superconducting electronics, as well as in quantum information and computation.