共查询到17条相似文献,搜索用时 156 毫秒
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介绍了一项扫描隧道显微术的最新成就。用扫描隧道显微镜操纵吸附在Cu(111)表面的铁原子,形成由48个铁原子组成的空心围栏,这一量子围栏能将所包围的表面态电子禁锢在其内部,从而可以用STM与STS同时研究禁锢电子的状态密度对空间和能量的分布。预期这一成果将在许多方面促进今后研究工作的发展。 相似文献
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将量子围栏作为二维无限深势阱来处理,用定态Schr dinger方程求出其波函数,并对围栏中的表面电子状态进行了讨论,最后在这一理论模型基础之上用MATLAB 6.1对模型计算结果进行了模拟和讨论,较好地解释了量子围栏中的表面电子所展现出的波动现象. 相似文献
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本文对在一条波线上的两个驻波的叠加结果进行了简明扼要的分析,对进一步理解行波和驻波之间的相互关系有积极的意义。 相似文献
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我们在考虑原子扫射后,严格求解了二能级原子被共振激光驻波衍射的二维Schrodinger方程在此基础上,数值计算了原子通过驻波栅的衍射谱以及动量分布,求得了原子,特别是慢原子了,在激光波栅上的反射系数。 相似文献
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带电粒子加速器是用人工方法借助不同形态的电场,将各种不同种类的带电粒子加速到更高能量的电磁装置。电子直线加速器是利用微波电场加速电子,使其具有直线运动轨道的加速装置。尽管20世纪60年代后期驻波电子直线加速器发展迅速,但其原理并不新颖。早在20世纪40年代中期,不少研究小组在研究行波电子直线加速器的同时,就已利用驻波电场加速电子。电子直线加速器有两种可供选择的工作方式,即行波工作方式和驻波工作方式。 相似文献
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在波动演示实验中引入驻波的尝试朱连喜.(江苏省药科学校镇江212003)用驻波(电动音叉)演示波的干涉,可弥补水波干涉的不足,能收到较好的效果.1驻波演示实验如图1所示,P是电动音叉,弦线一端A系在音叉上,另一端通过滑轮系一砝码,以使弦线拉紧,使电动... 相似文献
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We report on a theoretical study of the escape of confined surface states electrons from quantum corrals made of Cu adatoms on a Cu(1 1 1) surface. This study maps electron transmission through the corral wall and provides an extension of our earlier work focused on confinement in Cu corrals [S. Díaz-Tendero, F.E. Olsson, A.G. Borisov, J.P. Gauyacq, Phys. Rev. B 77 (2008) 205403]. The existence of two decay modes for the confined surface state is stressed: (i) non-resonant tunnelling through the corral wall concentrated on the Cu adatoms and (ii) a resonant-induced decay involving the transient formation of a resonant state localized on top of the corral wall. The present mapping of the electron transmission reveals how the interference between the two decay modes works: there exist regions where the electron leaves the corral, balanced by regions where it enters the corral, though the global behaviour of the quasi-stationary states is electron escape from the corral. 相似文献
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对超声检测中常用的楔形换能器的远场作了分析和实验。在理论上给出了在半无限大各向同性介质中纵波和横波指向性图案,以及在介质表面的瑞利波指向性图案。对于钢介质,对这三种波型作了指向性图案的数字计算,并对纵波和瑞利波作了指向性图案的测量。指出超声检测中某些需要考虑的问题。 相似文献
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在历史上,用微扰法求解非线性驻波是不成功的。本文对此进行了分析,认为微扰法给出的一次解是基本解,决定了驻波的基本波形。二次以上的解是由于非线性对波形的影响,使驻波波形上各点随时间运动稍加变动,因此对二次以上的微量只应保留其时间微商。这样所得解不但是稳定的,并且与根据波动方程的严格解基本相同。
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E. H. Khoo I. Ahmed Z. Guo V. Dixit M. T. W. Ang E. P. Li 《Applied Physics A: Materials Science & Processing》2013,112(3):597-603
In this paper, the near field distribution patterns formed from nanostripe corral and half spiral are investigated. Various near field distribution patterns are generated owning to the interference of propagating surface plasmon waves that emerged from the nanoslits or nanostripe. The half spiral nanoslits are illuminated with Stokes polarizations. Each polarization state shows a different field pattern at different locations on the surface of metal film. This is due to the excitation of surface plasmon waves at different parts of the nanostructures when illuminated with different types of polarization states. The same Stokes polarization states are also illuminated on a nanostripe corral structure. In this case, dipolar field distributions are observed when illuminated with different linear polarization states, while optical vortices are observed for circular polarization. It is believed that these interesting field patterns due to different arrangements of nanostructures could be used for near field imaging and polarization sensing. 相似文献
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Beil FW Wixforth A Wegscheider W Schuh D Bichler M Blick RH 《Physical review letters》2008,100(2):026801
We study the formation of shock waves in a nanomechanical resonator with an embedded two-dimensional electron gas using surface acoustic waves. The mechanical displacement of the nanoresonator is read out via the induced acoustoelectric current. Applying acoustical standing waves, we are able to determine the so-called anomalous acoustocurrent. This current is found only in the regime of shock wave formation. 相似文献