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1.
We study the topological properties of a one-dimensional (1D) hardcore Bose-Fermi mixture using the exact diagonalization method. We firstly add a hardcore boson to a fermionic system and by examining the edge states we find that the quasi-particle manifests the topological properties of the system. Then we study a mixture with 7 fermions and 1 boson. We find that the mixture also exhibits topological properties and its behaviors are similar to that of the corresponding fermionic system. We present a qualitative explanation to understand such behaviors using the mapping between a hardcore boson and a spinless fermion. These results show the existence of topological properties in a 1D hardcore Bose-Fermi mixture and may be realized using cold atoms trapped in optical lattices experimentally.  相似文献   
2.
The magneto-optical Kerr effect susceptometry technique is proposed to determine the uniaxial magnetic anisotropy(UMA) constant Ku. The magnetic properties of Cu/Fe/SiO2/Si grown by dc magnetron sputtering were investigated. The in-plane uniaxial magnetic anisotropy was probed by the magneto-optical Kerr effect(MOKE). The value of UMA, Ku= 2.5×103J/m3, was simulated from the field dependence of ac susceptibility along the hard axis according to the Stoner–Wohlfarth(S–W) model, which is consistent with Ku= 2.7×103J/m3 calculated from the magnetic hysteresis loops. Our results show that the magneto-optical Kerr effect susceptometry can be employed to determine the magnetic anisotropy constant owing to its high sensitivity.  相似文献   
3.
在满足近轴光线的条件下,可以利用成像公式和光路图法分析薄透镜或球面镜的物像关系,而本文介绍的这种诺莫图法,可以在直角坐标系上用坐标图示法分析薄透镜和球面镜的物像关系,不仅可以精确求得实物或虚物的成像位置,还可以判断出像的性质,具有简单、直观等特点,可以作为分析物像关系的一种补充手段.  相似文献   
4.
高铁仁  陈子瑜  彭勇  李发伸 《中国物理》2002,11(12):1307-1312
Arrays of Pt nanowires, fabricated by electrodepositing Pt metal into nanoporous anodic aluminium oxide (AAO) templates, exhibit a preferable optical absorption band in the ultraviolet-visible (UV-VIS) spectra and present a blueshift as the wire aspect ratio increases or its radius decreases. This type of optical property of Pt nanowire/porous alumina composites has been theoretically explored using Maxwell-Garnett (MG) effective medium theory. The MG theory, however, is only applicable to nanowires with an infinitesimally small radius relative to the wavelength of an incident light. The nanowire radius is controlled by the pore radius of the host alumina, which depends on anodizing conditions such as the selected electrolyte, anodizing time, temperature and voltage. The nanowire aspect ratios depend on the amount of Pt deposited into the nanopores of AAO films. The optical absorption properties of the arrays of Pt nanowires with diameters of 24, 55 and 90 nm have been investigated by the UV-VIS spectra, which show that the extinction maximum (λmax) shifts to shorter wavelength side as the wire aspect ratio increases or its radius decreases. The results are qualitatively consistent with those calculated based on the MG theory.  相似文献   
5.
白光照射到透明云母薄片时,后侧内表面产生的反射光与入射光会在云母片的前表面发生干涉.利用光谱仪可以观察到由于干涉而形成的条状光谱.改变入射光的偏振方向,可以观察到由于云母薄片双折射特性引起的干涉条纹的移动.根据条纹移动的方向,可以判定出云母片两正交的光轴方向上折射率的差异,从而判定出其快轴和慢轴.  相似文献   
6.
通过分析热波传输过程中产生的谐波的振幅谱和相位谱,测量了存在热耗散情况铜棒的热导率.该方法可以简化实验装置,消除谐波引起的系统误差,实验中热对流和热辐射对测量结果的影响可以忽略.  相似文献   
7.
张营堂  何萌  陈子瑜  吕惠宾 《物理学报》2009,58(3):2002-2004
采用激光分子束外延技术,在玻璃衬底上制备了La067Sr033MnO3 (LSMO) 薄膜,X射线衍射测量结果表明在玻璃衬底上生长的LSMO薄膜沿c轴择优取向生长.在外磁场3 T和88, 220, 300 K条件下,LSMO薄膜的磁电阻变化率分别达到-378%, -268%和-607%.实验结果表明,在廉价的玻璃衬底上制备大面积和具有应用价值的锰氧化物薄膜是可行的. 关键词: 锰氧化物薄膜 玻璃衬底 外延生长  相似文献   
8.
为加强工科学生的理科基础,提高工科人才的科学素养,我们尝试对部分工科院系进行了大学物理课程的改革,开设了理科模式的“基础物理学”课程,注重在强化基础、锻炼思维、提高能力和培养素养4个方面培养学生,取得了一定成果,得到了学生和兄弟院校的肯定.  相似文献   
9.
 介绍了北京正负电子对撞机直线加速器附设e,p试验束多丝室的结构及工作机理。该室间隙6 mm,窗口面积80 mm×80 mm,位置灵敏面积50 mm×50 mm;阳极丝和阴极丝分别采用直径为20 mm和50 mm镀金钨丝,阳极丝距2 mm,阴极丝距0.7 mm,每6根阴极丝并联构成阴极条,阴极条间距4.2 mm。采用阴极条感应重心读出分辨位置,对5.9 keV的γ光子,获得优于0.3 mm (FWHM)的位置分辨;对1.1 GeV电子束流,获得0.224 mm (FWHM)的位置分辨。  相似文献   
10.
叶军  何为  胡泊  汤进  张永圣  张向群  陈子瑜  成昭华 《中国物理 B》2015,24(2):27505-027505
A planar Hall effect(PHE) is introduced to investigate the magnetization reversal process in single-crystalline iron film grown on a Si(001) substrate.Owing to the domain structure of iron film and the characteristics of PHE,the magnetization switches sharply in an angular range of the external field for two steps of 90° domain wall displacement and one step of 180°domain wall displacement near the easy axis,respectively.However,the magnetization reversal process near the hard axis is completed by only one step of 90° domain wall displacement and then rotates coherently.The magnetization reversal process mechanism near the hard axis seems to be a combination of coherent rotation and domain wall displacement.Furthermore,the domain wall pinning energy and uniaxial magnetic anisotropy energy can also be derived from the PHE measurement.  相似文献   
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