物理学报2017，Vol.66Issue(21)：64-78,15.DOI:10.7498/aps.66.217201
多端口石墨烯系统中的非局域电阻
Nonlocal resistance in multi-terminal graphene system
摘要
Abstract
Since the nonlocal measurement is helpful in discovering nontrivial physics that is too difficult to detect directly,the nonlocal measurement has now become one of the research focuses in condensed matter physics.Recent experiments find the signal of the giant nonlocal resistance in an H-shaped multi-terminal graphene system.After excluding other possible transport mechanisms,such as the classic Ohmic diffusion and the edge states,researchers tend to believe that the nonlocal resistance signal originates from the spin/valley Hall effect existing in graphene sample.Based on the Landauer-Buttiker formula,the numerical results make a relatively perfect match with the experimental data in the same multi-terminal graphene system.However,though the theoretic research has made certain progress in explaining the existence of the nonlocal resistance,it is still difficult to understand some exotic behaviors of the nonlocal resistance,which exhibits properties even contradictory to the known classical theories.For instance,the nonlocal resistance decreases to zero much more rapidly than the local one,and the giant peak of the nonlocal resistance appears inside the energy gap of the graphene.In this review,the experiments focusing on the nonlocal resistance in multi-terminal graphene system are carefully reviewed.Besides,this review also shows the associated theoretic studies,and an overlook of the future study is also provided.关键词
非局域电阻/石墨烯/自旋霍尔效应/谷霍尔效应Key words
nonlocal resistance/graphene/spin Hall effect/valley Hall effect引用本文复制引用
王孜博,江华,谢心澄..多端口石墨烯系统中的非局域电阻[J].物理学报,2017,66(21):64-78,15.基金项目
国家重点基础研究发展计划(批准号:2015CB921102,2014CB920901)、国家自然科学基金(批准号:11704348,11374219,11534001,11404300)和科学挑战计划(批准号:TZ2016003-1)资助的课题.Project supported by the National Basic Research Program of China (Grant Nos.2015CB921102,2014CB920901),the National Natural Science Foundation of China (Grant Nos.11704348,11374219,11534001,11404300),and the Science Challenge Project,China (Grant No.TZ2016003-1). （批准号:2015CB921102,2014CB920901）
