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国家自然科学基金(20731160012)

作品数:4 被引量:13H指数:2
相关作者:俞大鹏王朋伟章新政单旭东张洋更多>>
相关机构:北京大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:金属学及工艺一般工业技术电子电信更多>>

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Magnetism in Carbon Nanoscrolls: Quasi-Half-Metals and Half-Metals in Pristine Hydrocarbons被引量:3
2009年
A magnetic ground state is revealed for the first time in zigzag-edged carbon nanoscrolls(ZCNSs)from spin-unrestricted density functional theory calculations.Unlike their flat counterpart-zigzag-edged carbon nanoribbons,which are semiconductors with spin-degenerate electronic structure-ZCNSs show a variety of magnetic configurations,namely spin-selective semiconductors,metals,semimetals,quasi-half-metals,and half-metals.To the best of our knowledge,this is the first discovery of quasi-half-metals and half-metals in a pure hydrocarbon without resort to an external electric field.In addition,we calculated the spin-dependent transportation of the semiconducting ZCNSs with 12 and 20 zigzag chains,and found that they are 13% and 17% at the Fermi level,respectively,suggesting that ZCNS can be an effective spin filter.
Lin LaiJing LuLu WangGuangfu LuoJing ZhouRui QinYu ChenHong LiZhengxiang GaoGuangping LiWai Ning MeiYutaka MaedaTakeshi Akasakaand Stefano Sanvito
关键词:HALF-METALS
金属表面微纳米光滑构造的新方法
2009年
传统的曝光技术等平面工艺通常只能获得边缘陡峭的平面结构。通过多层曝光、灰度曝光、聚焦离子束加工等方法可以实现高度渐变的准三维结构的构造,却往往难以获得良好的光滑度。本文结合电子束曝光技术、PMMA结构平滑技术、模板剥离技术,实现了多种多样的渐变结构的构造。这种技术具有构造方法简单、表面粗糙度小、可自由定位等众多优点。
张洋朱新利廖志敏俞大鹏
关键词:金属电子束曝光
Tapered dielectric structure in metal as a wavelength-selective surface plasmon polariton focuser
2009年
Symmetric tapered dielectric structures in metal have demonstrated applications such as the nanofocusing of surface plasmon polaritons, as well as the waveguiding of V-channel polaritons. Yet the fabrication of smooth-surfaced tapered structure remains an obstacle to most researchers. We have successfully developed a handy method to fabricate metal-sandwiched tapered nanostructures simply with electron beam lithography. Though these structures are slightly different from conventional symmetric V-shaped structures, systematic simulations show that similar functionality of surface plasmon polariton nanofocusing can still be achieved. When parameters are properly selected, wavelength- selective nanofocusing of surface plasmon polaritons can be obtained.
张洋赵清廖志敏俞大鹏
关键词:FOCUSING
SnO2掺Ag纳米线的制备、结构表征及光学性质研究被引量:10
2008年
用化学气相沉积法在管式炉中制备了SnO2掺Ag纳米线。纳米线直径约50 nm,长几十微米。通过XRD、TEM和Raman谱仪等测量确定SnO2掺Ag纳米线为金红石型结构,XPS谱表明样品中含有Sn、O和Ag元素,Ag的浓度约为1.8 at.%,室温PL谱显示样品在626nm处有很强的红光发射峰。
王朋伟单旭东章新政俞大鹏
关键词:掺杂发光
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