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应用计算机控制的PID控温仪研究了锑化铟样品的变温霍耳效应。通过在线控制并记录77K~300K温度范围内锑化铟样品的霍耳电压,估测了样品的禁带宽度。 相似文献
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YANGHong-jun ZHAOBai-jun FANGXiu-jun DUGuo-tong LIUDa-li GAOChun-xiao LIUXi-zhe 《高等学校化学研究》2005,21(2):137-140
Piezoelectric ZnO layers with high resistivity for surface acoustic wave applications were prepared on polycrystalline diamond/Si substrates with(Ill) orientation via metal-organic chemical vapour deposition.The characteristics of the films were optimized through different growth methods. The comparative study of the X-ray diffraction spectra and scanning electron microscopic images showed that the final-prepared ZnO films were dominantly c-axis oriented. Zn and O elements in the final prepared ZnO films were investigated through X-ray photoelectron spectroscopy. According to the statistical results, the n(Zn)/n(O) ratio is near 1. The Raman scattering was also performed in back scattering configuration. E2 mode was observed for the final films, which indicated that the better quality ZnO films had been obtained. The resistivity of the films was also enhanced via the modification of the growth methods. 相似文献
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The anomalous Hall effect of heavy holes in semiconductor quantum
wells is studied in the intrinsic transport regime, where the Berry
curvature governs the Hall current properties. Based on the
first--order perturbation of wave function the expression of the
Hall conductivity the same as that from the semiclassical equation
of motion of the Bloch particles is derived. The dependence of Hall
conductivity on the system parameters is shown. The amplitude of
Hall conductivity is found to be balanced by a competition between
the Zeeman splitting and the spin--orbit splitting. 相似文献
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应用计算机控制的PID控温仪研究了锑化铟样品的变温霍耳效应。通过在线控制并记录77K-300K温度范围内锑化铟样品的霍耳电压,估测了样品的禁带宽度。 相似文献
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矢量光束的一般表示方法是利用投影矩阵和广义琼斯矢量的乘积描述.投影矩阵存在一个自由度,该自由度与有限光束的场矢量偏振状态有关,由特定的单位矢量与波矢量间的方位角决定,可以定量地描述矢量光束的偏振状态.本文在矢量光束描述的理论基础上,通过对投影矩阵进行与反射光束与透射光束传播方向相应的坐标旋转,根据麦克斯韦方程组及其边界条件,计算讨论在各向同性介质界面上反射、透射矢量光束的表示形式以及其自旋霍尔效应表现出的横向位移.线偏振光(光子自旋量为σ=0)横向位移为零,圆偏振光束(光子自旋量为σ=±1)位移量最大且左圆偏振与右圆偏振光束的位移大小相等方向相反,进一步分析了左圆偏振光束在界面上的反射、透射光束的横向位移与入射角的关系. 相似文献
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霍耳效应是1879年美国物理学家霍耳研究载流导体在磁场中导电的性质时发现的一种电磁效应.他在长方形导体薄片上通以电流,沿电流的垂直方向加磁场(如图1),发现在与电流和磁场两者垂直的两侧面产生了电位差.后来这个效应广泛应用于半导体研究.一百年过去了.1980年一种新的霍耳效应又被发现.这就是德国物理学家冯·克利青从金属-氧化物-半导体场效应晶体管(MOSFET)发现的量子霍耳效应. 相似文献