Topologically guaranteed enhancement of nonlinear optical conductivity of graphene in the presence of spin-orbit coupling
Topologically guaranteed enhancement of nonlinear optical conductivity of graphene in the presence of spin-orbit coupling
复制标题
自旋轨道耦合下拓扑保证石墨烯非线性光学电导率的增强
DOI：
10.1103/physrevb.90.235430
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发表时间：
2014-12
影响因子：
3.7
通讯作者：
C. Zhang
中科院分区：
文献类型：
--
作者：
Zheng Liu;Matthew S;erson;J. C. Cao;C. Zhang
我们证明了石墨烯中的拓扑不变项(例如，自旋-轨道耦合或层间耦合引起的三角翘曲)可以导致强烈的非线性光学响应。我们给出了有限Rashba自旋-轨道耦合的单层石墨烯三阶非线性光学电导的全量子力学分析。当入射光子能量低于三角翘曲的最大高度，且Rashba耦合强度超过某一临界值时，非线性电导比没有拓扑项时显着增强。由于三角翘曲效应和能带几何的拓扑不等价变化，只要入射光子能量限制在自旋-轨道耦合定义的能量最大值以下，强非线性效应就会持续存在。《学科工程|科学与技术研究》出版详解刘振中、桑德森、曹金.、张金.(2014)。在存在自旋-轨道耦合的情况下，石墨烯的非线性光学导电性在拓扑上得到保证的增强。《凝聚态物质与材料物理学》，90(23)，235430-1-235430-6。这篇期刊文章可以在Research Online上找到：http://ro.uow.edu.au/eispapers/3830物理评论B 90,235430(2014年)在自旋轨道耦合作用下石墨烯的非线性光学电导的拓扑保证增强(2014年9月1日收到；2曹建中，1，*和C·张2，†1太赫兹固态技术重点实验室，中国科学院上海微系统与信息技术研究所，上海长宁路865号，上海200050；中国2物理学院，澳大利亚新南威尔士州卧龙岗大学物理学院，2522(收到2014年9月1日；2014年11月27日收到修订稿；发表于2014年12月22日)，我们证明了石墨烯中的拓扑不变项(例如，自旋-轨道耦合或层间耦合引起的三角翘曲)可以导致强烈的非线性光学响应。我们给出了有限Rashba自旋-轨道耦合的单层石墨烯三阶非线性光学电导的全量子力学分析。当入射光子能量低于三角翘曲的最大高度，且Rashba耦合强度超过某一临界值时，非线性电导比没有拓扑项时显着增强。由于三角翘曲效应和能带几何的拓扑不等价变化，只要入射光子能量限制在自旋-轨道耦合定义的能量最大值以下，强非线性效应就会持续存在。DOI：10.1103/PhysRevB.90.235430PACS号(S)：73.63.Bd，78.66，78.67.−n
We demonstrate that a topological invariant term in graphene (e.g., spin-orbit coupling or interlayer coupling induced trigonal warping) can lead to a strong nonlinear optical response. We present a full quantummechanical analysis of the third-order nonlinear optical conductivity of the monolayer graphene with a finite Rashba spin-orbit coupling. For energy of the incident photon below the maximum height of the trigonal warping and the Rashba coupling strength exceeding a critical value the nonlinear conductance is enhanced dramatically in comparison with that in the absence of the topological term. Due to the trigonal warping effect and the topologically inequivalent change of the geometry of the energy band, the strong nonlinear effect persists, as long as the incident photon energy is limited below the energy maximum defined by the spin-orbit coupling. Disciplines Engineering | Science and Technology Studies Publication Details Liu, Z., Sanderson, M., Cao, J. & Zhang, C. (2014). Topologically guaranteed enhancement of nonlinear optical conductivity of graphene in the presence of spin-orbit coupling. Physical Review B Condensed Matter and Materials Physics, 90 (23), 235430-1-235430-6. This journal article is available at Research Online: http://ro.uow.edu.au/eispapers/3830 PHYSICAL REVIEW B 90, 235430 (2014) Topologically guaranteed enhancement of nonlinear optical conductivity of graphene in the presence of spin-orbit coupling Zheng Liu,1 Matthew Sanderson,2 J. C. Cao,1,* and C. Zhang2,† 1Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China 2School of Physics, University of Wollongong, New South Wales 2522, Australia (Received 1 September 2014; revised manuscript received 27 November 2014; published 22 December 2014) We demonstrate that a topological invariant term in graphene (e.g., spin-orbit coupling or interlayer coupling induced trigonal warping) can lead to a strong nonlinear optical response. We present a full quantum-mechanical analysis of the third-order nonlinear optical conductivity of the monolayer graphene with a finite Rashba spin-orbit coupling. For energy of the incident photon below the maximum height of the trigonal warping and the Rashba coupling strength exceeding a critical value the nonlinear conductance is enhanced dramatically in comparison with that in the absence of the topological term. Due to the trigonal warping effect and the topologically inequivalent change of the geometry of the energy band, the strong nonlinear effect persists, as long as the incident photon energy is limited below the energy maximum defined by the spin-orbit coupling. DOI: 10.1103/PhysRevB.90.235430 PACS number(s): 73.63.Bd, 78.66.Tr, 78.67.−n
影响因子：
4.1
作者：
R. Stephenson
通讯作者：
R. Stephenson