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Topological insulator materials, including Bi2Te3, Sb2Te3, Sb2Te3, and Bi2Se3, have attracted some attention due to their narrow band gaps, high carrier mobility, wide spectral absorption ranges and other characteristics.We report a new multi-compound topological insulator material BiSbTeSe2 that, compared with the traditional topological insulator composed of two elements, can integrate the physic... 相似文献
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The interaction between optical solitons is of great significance for studying interaction between light and matter and development of all-optical devices, and is conducive to the design of integrated optical path. Optical soliton interactions for the nonlinear Schr¨odinger equation are investigated to improve the communication quality and system integration. Solutions of the equation are derived and used to analyze the interaction of two solitons.Some suggestions are put forward to weaken their... 相似文献
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恒电流计量电位溶出法测定环境水样中痕量银 总被引:2,自引:0,他引:2
采用玻璃电极-氯化银参比电极-铂对电极三电极系统的恒电流微分计量电溶出分析,在0.1mol.L^-1HNO3-0.05mol.^-1KNO3介质中,银在-0.340V左右呈现良好的氧化溶出峰,用此峰可进行银的微分计时电位溶出分析。在2.5-120μg.L^-1范围内的浓度与峰高呈线性关系,相关系数为0.9992,方法用于环境水样中痕量银的测定,获得满意结果。 相似文献
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This work focuses on chirped solitons in a higher-order nonlinear Schr¨odinger equation, including cubic-quinticseptic nonlinearity, weak nonlocal nonlinearity, self-frequency shift, and self-steepening effect. For the first time,analytical bright and kink solitons, as well as their corresponding chirping, are obtained. The influence of septic nonlinearity and weak nonlocality on the dynamical behaviors of those nonlinearly chirped solitons is thoroughly addressed. The findings of the study give... 相似文献
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实现高维光孤子是非线性光学研究中一个长期的目标.本文设计了一个里德伯冷原子与贝塞尔晶格势耦合的系统,发现了一系列稳定的二维空间光孤子簇,包括基极孤子、二级孤子、四级孤子和涡旋孤子.研究表明,光传播系数、非局域非线性系数、贝塞尔晶格常数可以用来调控光孤子的产生、空间分布及演化;在系统参数的调控下,该光孤子簇具备空间稳定性,能够在一定距离内稳定传播.本研究为高维空间光孤子的产生和调控提供了一种新的思路. 相似文献
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Soliton fusion and fission for the high-order coupled nonlinear Schr?dinger system in fiber lasers
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With the rapid development of communication technology,optical fiber communication has become a key research area in communications.When there are two signals in the optical fiber,the transmission of them can be abstracted as a high-order coupled nonlinear Schr¨odinger system.In this paper,by using the Hirota’s method,we construct the bilinear forms,and study the analytical solution of three solitons in the case of focusing interactions.In addition,by adjusting different wave numbers for phase control,we further discuss the influence of wave numbers on soliton transmissions.It is verified that wave numbers k11,k21,k31,k22,and k32can control the fusion and fission of solitons.The results are beneficial to the study of all-optical switches and fiber lasers in nonlinear optics. 相似文献
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We propose a scheme to generate stable vector spatiotemporal solitons through a Rydberg electromagnetically induced transparency(Rydberg-EIT) system. Three-dimensional vector monopole and vortex solitons have been found under three nonlocal degrees. The numerical calculation and analytical solutions indicate that these solitons are generated with low energy and can stably propagate along the axes. The behavior of vector spatiotemporal solitons can be manipulated by the local and nonlocal nonline... 相似文献