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物理学院“博约学术论坛”系列讲座(第100期)

发布日期:2017年03月20日

题目:All Carbon Spin Filter Induced by Localized States at Nanodomain Boundaries in Graphene
报告人:吴汉春 研究员 北京理工大学物理学院
时 间:2017年1月16日(周一)上午10:00
地 点:北京理工大学中心教学楼610
摘要:
Current technology is on the cusp of another revolution, traditional electronics are reaching their physical limits and spintronics is viewed as the future of information technology. Graphene is known for its extraordinary electronic properties and is expected to play an integral part of the roadmap towards spintronics, because of its long spin life times and long diffusion lengths at room temperature. However, its spintronic capabilities are yet to be unlocked. A critical unresolved stumbling block on this road is that pristine graphene is diamagnetic and carbon does not possess d or f electrons. Thus, the decisive question is how to make graphene magnetic. Here, we presented our recent study of the magnetoresistance (MR) of graphene grown on technologically relevant SiC/Si(001) wafers [1]. A zig-zag structure is formed on one side of the nanodomain boundaries (NBs) and ripples with large curvatures are formed on both adjacent sides [2]. Localized states at the NBs result in an unprecedented positive in-plane MR with a strong temperature dependence. Moreover, a spin-filter effect is achieved without external fields and persists at room temperature. Our work shows an interesting way to add the spin degree of freedom to graphene, and thus offers a route towards all-carbon embedded electronic and spintronic graphene architectures.
Reference:
1. Han-Chun Wu, et al., Large Positive In-Plane Magnetoresistance Induced by Localized States at Nanodomain Boundaries in Graphene, Nature Communications (In press).
2. Han-Chun Wu, et al. Transport Gap Opening and High On-Off Current Ratio in Trilayer Graphene with Self-Aligned Nanodomain Boundaries, ACS Nano 9, 8967 (2015).

简历:
Prof. Han-Chun Wu received his M.S. and Ph.D. from Tsinghua University, China in 2004 and from Trinity College Dublin, Ireland in 2008 respectively. He joined Beijing Institute of Technology in June 2014 as a professor. His interests focus on how intrinsic and extrinsic defects will affect the electronic, magnetic and transport properties of materials and accordingly engineer them to maximize performance. He is also interested in developing new methods to manipulate the spin states of magnetic nanostructures. Prof. Wu has authored or co-authored more than 68 scientific research articles in peer reviewed international high impact journals, such as Nature Communications, Nano Letters, Advanced Materials, and etc.
王志 wangzhi@bit.edu.cn