您的位置: 专家智库 > >

国家重点基础研究发展计划(2009CB929103)

作品数:10 被引量:5H指数:2
相关作者:高鸿钧肖文德潘新宇刘东奇常彦春更多>>
相关机构:中国科学院中国人民解放军更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金更多>>
相关领域:理学一般工业技术机械工程更多>>

文献类型

  • 10篇中文期刊文章

领域

  • 8篇理学
  • 2篇机械工程
  • 2篇一般工业技术

主题

  • 4篇自旋
  • 4篇GRAPHE...
  • 2篇电子自旋
  • 2篇
  • 1篇电子自旋共振
  • 1篇扫描隧道显微...
  • 1篇色心
  • 1篇手征
  • 1篇手征性
  • 1篇酞菁
  • 1篇自旋极化
  • 1篇自旋态
  • 1篇外加磁场
  • 1篇金刚石
  • 1篇金属
  • 1篇金属酞菁
  • 1篇空位
  • 1篇刚石
  • 1篇PROBE
  • 1篇RAMAN_...

机构

  • 4篇中国科学院
  • 1篇中国人民解放...

作者

  • 2篇肖文德
  • 2篇高鸿钧
  • 1篇杜世萱
  • 1篇赵琳峰
  • 1篇刘刚钦
  • 1篇姜宇航
  • 1篇常彦春
  • 1篇刘东奇
  • 1篇刘艳芳
  • 1篇潘新宇
  • 1篇连季春
  • 1篇胡欣
  • 1篇张礼智
  • 1篇刘立巍
  • 1篇杨锴
  • 1篇徐成伟
  • 1篇杨丽丽
  • 1篇张新霞

传媒

  • 6篇Chines...
  • 2篇物理学报
  • 1篇物理
  • 1篇量子光学学报

年份

  • 1篇2015
  • 1篇2014
  • 2篇2013
  • 2篇2012
  • 2篇2011
  • 2篇2010
10 条 记 录,以下是 1-10
排序方式:
Influence of reaction parameters on synthesis of high-quality single-layer graphene on Cu using chemical vapor deposition
2014年
Large-area monolayer graphene samples grown on polycrystalline copper foil by thermal chemical vapor deposition with differing CH4 flux and growth time are investigated by Raman spectra, scanning electron microscopy, atomic force microscopy, and scanning tunneling microscopy. The defects, number of layers, and quality of graphene are shown to be controllable through tuning the reaction conditions: ideally to 2-3 sccm CH4 for 30 minutes.
杨贺申承民田园王高强林少雄张一顾长志李俊杰高鸿钧
关键词:GRAPHENE
氢原子吸附对金表面金属酞菁分子的吸附位置、自旋和手征性的调控
2015年
实现单个功能有机分子构型、电子结构和自旋态的可逆调控,是未来分子电子学和分子自旋电子学应用的关键.近年来,我们利用极低温强磁场超高真空扫描隧道显微镜系统,结合第一性原理计算,系统研究了氢原子吸附对金表面吸附的金属酞菁分子的自旋、手性和吸附位置的调控.通过将金表面吸附的酞菁锰分子暴露于氢气或氢原子环境,使得分子中心的磁性离子吸附单个氢原子,从而实现了体系近藤效应由"开"到"关"的转变.基于密度泛函理论的第一性原理计算表明,氢原子吸附使得锰离子3d轨道内的电荷重排导致了分子的自旋由3/2降为1;同时分子与金基底的间距增大,使得近藤效应消失.通过施加局域电压脉冲或者给样品加热,可以实现单个或所有分子脱氢,从而恢复体系的自旋态和近藤效应.氢原子吸附还导致分子的优先吸附位置从金表面的面心立方堆垛区域变成了六角密排堆垛区域.三个氢原子吸附于同一酞菁锰分子上,可导致分子对称性的降低及分子镜面对称轴与金基底镜面对称轴的偏离,从而导致手征性的出现.这种分子吸附结构的手征性,导致分子轨道也呈现出手征性.这项工作为金属酞菁未来在分子电子学、自旋电子学、气体传感器等方面的应用提供了新思路.
肖文德刘立巍杨锴张礼智宋博群杜世萱高鸿钧
关键词:扫描隧道显微镜金属酞菁自旋态手征性
自旋极化扫描隧道显微镜的研究进展
2010年
自旋极化扫描隧道显微镜(spin-polarized scanning tunneling microscope,SP-STM)将扫描隧道显微镜(scanning tunneling microscope,STM)的实空间分辨率和对自旋敏感的磁成像技术结合起来,已经成为人们研究纳米磁性物理的最有效工具之一.文章介绍了SP-STM的工作原理及其在低维磁性物理领域的应用和最新进展,如对磁性薄膜、磁性纳米岛、磁性原子及不共线结构的研究等,并对我国在这一领域的研究现状和发展前景进行简要评述.
姜宇航连季春肖文德高鸿钧
关键词:自旋极化
The influence of annealing temperature on the morphology of graphene islands
2012年
We report on temperature-programmed growth of graphene islands on Ru (0001) at annealing temperatures of 700 ℃, 800 ℃, and 900 ℃. The sizes of the islands each show a nonlinear increase with the annealing temperature. In 700 ℃ and 800 ℃annealings, the islands have nearly the same sizes and their ascending edges are embedded in the upper steps of the ruthenium substrate, which is in accordance with the etching growth mode. In 900 ℃ annealing, the islands are much larger and of lower quality, which represents the early stage of Smoluchowski ripening. A longer time annealing at 900 ℃ brings the islands to final equilibrium with an ordered moire pattern. Our work provides new details about graphene early growth stages that could facilitate the better control of such a growth to obtain graphene with ideal size and high quality.
黄立徐文焱阙炎德潘毅高敏潘理达郭海明王业亮杜世萱高鸿钧
Measuring thermoelectric property of nano-heterostructure
2011年
A method of measuring the thermoelectric power of nano-heterostructures based on four-probe scanning tunneling microscopy is presented. The process is composed of the in-situ fabrication of a tungsten-indium tip, the precise control of the tip-sample contact and the identification of thermoelectric potential. When the temperature of the substrate is elevated, while that of the tip is kept at room temperature, a thermoelectric potential occurs and can be detected by a current voltage measurement. As an example of its application, the method is demonstrated to be effective to measure the thermoelectric power in several systems. A Seebeck coefficient of tens of IxV/K is obtained in graphene epitaxially grown on Ru (0001) substrate and the thermoelectric potential polarity of this system is found to be the reverse of that of bare Ru (0001) substrate.
路红亮张晨栋蔡金明高敏邹强郭海明高鸿钧
关键词:GRAPHENE
Intercalation of metals and silicon at the interface of epitaxial graphene and its substrates
2013年
Intercalations of metals and silicon between epitaxial graphene and its substrates are reviewed. For metal intercala- tion, seven different metals have been successfully intercalated at the interface of graphene/Ru(O001) and form different intercalated structures. Meanwhile, graphene maintains its original high quality after the intercalation and shows features of weakened interaction with the substrate. For silicon intercalation, two systems, graphene on Ru(O001) and on Ir(l I 1), have been investigated. In both cases, graphene preserves its high quality and regains its original superlative properties after the silicon intercalation. More importantly, we demonstrate that thicker silicon layers can be intercalated at the interface, which allows the atomic control of the distance between graphene and the metal substrates. These results show the great potential of the intercalation method as a non-damaging approach to decouple epitaxial graphene from its substrates and even form a dielectric layer for future electronic applications.
黄立徐文焱阙炎德毛金海孟蕾潘理达李更王业亮杜世萱刘云圻高鸿钧
关键词:GRAPHENE
金刚石中氮空位中心在外加磁场下的电子自旋共振被引量:2
2012年
金刚石中单个氮空位中心的电子自旋在激光辐射下能够发出近红外的光致荧光,增加微波辐射可以对其进行量子调控,是室温条件下实现量子计算机的主要介质之一。本文利用激光共聚焦扫描显微系统观测到了金刚石晶体中氮空位中心的荧光二维扫描图,并通过二次相关函数测量验证了氮空位中心是单光子源。改变微波辐射频率得到了电子自旋共振谱,从而实现了对单个氮空位中心的量子调控。利用设计的可控静磁场研究了氮空位中心在不同磁场方向和大小时的光致荧光特性和自旋共振峰。实验结果表明两个电子自旋共振峰间的频率间距与静磁场的旋转角度成余弦函数关系,与理论分析结果一致。
胡欣杨丽丽徐成伟赵琳峰张新霞刘艳芳
关键词:金刚石电子自旋共振
Thermoelectric-transport in metal/graphene/metal hetero-structure
2010年
We investigate the thermoelectric-transport properties of metal/graphene/metal hetero-structure. We use a single band tight-binding model to prcsent the two-dimensional electronic band structure of graphene. Using the LandauerButticker formula and taking the coupling between graphene and the two electrodes into account, we can calculate the thermoelectric potential and current versus temperature. It is found that in spite of metal electrodes, the carrier type of graphene determines the electron motion direction driven by the difference in temperature between the two electrodes, while for n type graphene, the electrons move along the thermal gradient, and for p type graphene, the electrons move against the thermal gradient.
胡昊蔡金明张晨栋高敏潘毅杜世萱孙庆丰牛谦谢心澄高鸿钧
关键词:THERMOELECTRICITY
金刚石纳米颗粒中氮空位色心的电子自旋研究被引量:3
2013年
通过电子注入的方法制备了含氮空位色心单光子源的金刚石荧光纳米颗粒.自旋回声测试结果表明,纳米颗粒中氮空位色心的相干时间T2很短,介于0.86μs至5.6μs之间.Ramsey干涉条纹测试结果表明,氮空位色心NV1点的退相干时间T2最大,为0.7μs,其电子自旋共振谱可分辨的最小线宽为1.05MHz.并且NV1点的电子自旋共振谱可分辨氮空位色心本身的14N核自旋与氮空位色心电子自旋之间的2.2MHz超精细相互作用,这对于在金刚石纳米颗粒中实现核自旋的操控和多个量子比特的门操作具有重要意义.
刘东奇常彦春刘刚钦潘新宇
关键词:电子自旋
Nuclear spin induced collapse and revival shape of Rabi oscillations of a single electron spin in diamond被引量:1
2011年
A collapse and revival shape of Rabi oscillations in an electron spin of a single nitrogen-vacancy centre has been observed in diamond at room temperature. Because of hyperfine interaction between the host ^14N nuclear spin and the nitrogen-vacancy centre electron spin, different orientations of the ^14N nuclear spins lead to a triplet splitting of the transition between ground state (ms = 0) and excited state (ms=1). The manipulation of the single electron spin of nitrogen-vacancy centre is achieved by using a combination of selective microwave excitation and optical pumping at 532 nm. Microwaves can excite three transitions equally to induce three independent nutations and the shape of Rabi oscillations is a combination of the three nutations.
胡欣刘东奇潘新宇
共1页<1>
聚类工具0