搜索结果: 1-15 共查到“知识库 电介质物理学”相关记录83条 . 查询时间(4.203 秒)
径向压缩碳纳米管的电子输运性质
碳纳米管 电子输运性质 径向形变 第一性原理
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2022/3/24
研究径向压缩形变对碳纳米管电子输运性质的影响对搭建微纳碳基电子器件具有重要意义。本文利用分子动力学模拟方法研究了碳纳米管与金属界面接触构型，得出碳纳米管径向压缩形变的规律。模拟结果表明：碳纳米管在水平接触金属表面后，其稳定状态下的径向压缩形变大小会受接触长度、管径大小、金属种类和片层数量的影响。基于紧束缚密度泛函理论和非平衡格林函数结合的第一性原理，系统地研究了不同直径、手性、片层、径向压缩形变碳...
清华大学物理系在界面诱导的电荷密度波研究方面取得进展（图）
界面诱导 电荷密度波 低维量子材料 固体电子系统 分子束外延技术
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2022/4/22
电荷密度波是一种宏观量子现象，表现为晶体中电荷密度的周期性调制，广泛存在于如过渡金属硫族化合物等低维量子材料中，在光电子和量子信息等方面有着重要的应用前景。作为固体电子系统中的一种集体凝聚现象，电荷密度波的微观机理和调控一直是凝聚态物理研究领域备受关注的前沿课题。
Eu2+,Dy3+共掺CaxSr2-xSiO4:硅酸盐固溶体发光性质探究
发光材料 固溶体 稀土离子 结构性质 发光特性
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2022/3/24
稀土发光材料和固溶体发光材料受到人们的广泛关注，稀土固溶体发光材料本身的结构特性在一定程度上能够影响和决定它的发光特性，而发光特性又直接关系到材料的性能和使用前景.因此，本论文的主要工作时通过改变固溶体发光材料CaxSr2-xSiO4:0.01Eu2+,0.01Dy3+固溶离子Ca和Sr的比例浓度来实现对固溶体发光材料基质结构的调节，测得了不同固溶比例下的样品的激发光谱和部分发射光谱以及热释光谱，...
嵌入不透水球体复合多孔介质渗流场分析
多孔介质渗流 球体绕流 Brinkman-extended Darcy方程 等效渗透系数
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2018/7/4
嵌入不透水球体的复合多孔介质广泛存在于地下水渗流领域，由于不透水球体的影响，多孔介质中的水在流经不透水球体时发生绕流，且距离球体越近绕流现象越明显。为求解该复合介质的渗流场和等效渗透系数，在球坐标系下采用非线性Brinkman-extended Darcy方程，以无穷远处单向来流均匀和球面不滑移条件作为边界条件，求解出球体周围渗流流速与压强的解析解。分析该解析解表达式可知，此复合介质渗流场流速和压...
Quantum percolation in quantum spin Hall antidot systems
Quantum percolation quantum spin Hall antidot systems
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2012/2/27
We study the influences of antidot-induced bound states on transport properties of two- dimensional quantum spin Hall insulators. The bound statesare found able to induce quantum percolation in the or...
Unusual pattern formation on Si(100) due to low energy ion bombardment
Unusual pattern formation Si(100) low energy ion bombardment
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2012/2/27
In this paper evolution of silicon surface topography, under low energy ion bombardment, is investigated at higher oblique incident angles in the range of 63\degree-83\degree. Si(100) substrates were ...
Highly tunable spin-dependent electron transport through carbon atomic chains connecting two zigzag graphene nanoribbons
Highly tunable spin-dependent electron transport carbon atomic chains zigzag graphene nanoribbons
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2012/2/27
Motivated by recent experiments of successfully carving out stable carbon atomic chains from graphene [Meyer et al. Nature (London) 454, 319 (2008); Jin et al. Phys. Rev. Lett. 102, 205501 (2009)] we ...
Tailoring population inversion in Landau-Zener-Stuckelberg interferometry of flux qubits
Tailoring population inversion Landau-Zener-Stuckelberg interferometry flux qubits
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2012/2/27
We distinguish different mechanisms for population inversion in flux qubits driven by dc+ac magnetic fields. We show that for driving amplitudes such that there are Landau-Zener-St\"uckelberg interefe...
Effect of charged impurity correlation on transport in monolayer and bilayer graphene
charged impurity correlation transport monolayer bilayer graphene
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2012/2/27
We study both monolayer and bilayer graphene transport properties taking into account the presence of correlations in the spatial distribution of charged impurities. In particular we find that the exp...
Spin current and polarization reversal through a single-molecule magnet with ferromagnetic electrodes
Spin current polarization reversal single-molecule magnet ferromagnetic electrodes
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2012/2/27
We theoretically study the spin-polarized transport through a single-molecule magnet, which is weakly coupled to ferromagnetic leads, by means of the rate-equation approach. We consider both the ferro...
The Role of Nonlinear Dynamics in Quantitative Atomic Force Microscopy
Role Nonlinear Dynamics Quantitative Atomic Force Microscopy
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2012/2/27
Various methods of force measurement with the Atomic Force Microscope (AFM) are compared for their ability to accurately determine the tip-surface force from analysis of the nonlinear cantilever motio...
Impurity-assisted Andreev reflection at a spin-active half-metal-superconductor interface
Impurity-assisted Andreev reflection spin-active half-metal-superconductor interface
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2012/2/27
The Andreev reflection amplitude at a clean interface between a half-metallic ferromagnet (H) and a superconductor (S) for which the half metal's magnetization has a gradient perpendicular to the inte...
Manipulating infrared photons using plasmons in transparent graphene superlattices
Manipulating infrared photons plasmons transparent graphene superlattices
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2012/2/27
Superlattices are artificial periodic nanostructures which can control the flow of electrons. Their operation typically relies on the periodic modulation of the electric potential in the direction of ...
Lattice Results for Low Moments of Light Meson Distribution Amplitudes
Low Moments of Light Meson Distribution Amplitudes
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2011/1/14
As part of the UKQCD and RBC collaborations’ Nf = 2+1 domain-wall fermion phenomenology
programme, we calculate the first two moments of the light-cone distribution amplitudes of the
pseudoscalar me...
Drag induced lift in granular media
Drag induced lift granular media
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2010/11/23
Laboratory experiments and numerical simulation reveal that a submerged intruder dragged hor-
izontally at constant velocity within a granular medium experiences a lift force whose sign and
magnitud...