南通家纺品牌化战略构想

本文通过分析南通家纺企业发展的优势劣势,总结出家纺企业品牌化发展的不足,提出将南通蓝印与家纺结合,明确从文化底蕴、色彩、纹样及自然观四个方面进行挖掘和研究,在此基础上找出适合南通家纺品牌化发展的道路。

Broadband strong optical dichroism in topological Dirac semimetals with Fermi velocity anisotropy

Prototypical three-dimensional(3D)topological Dirac semimetals(DSMs),such as Cd3As2 and Na3Bi,contain electrons that obey a linear momentum-energy dispersion with different Fermi velocities along the three orthogonal momentum dimensions.Despite being extensively studied in recent years,the inherent Fermi velocity anisotropy has often been neglected in the theoretical and numerical studies of 3D DSMs.Although this omission does not qualitatively alter the physics of light-driven massless quasiparticles in 3D DSMs,it does quantitatively change the optical coefficients which can lead to nontrivial implications in terms of nanophotonics and plasmonics applications.Here we study the linear optical response of 3D DSMs for general Fermi velocity values along each direction.Although the signature conductivity-frequency scaling,σ(ω)∝ω,of 3D Dirac fermion is well-protected from the Fermi velocity anisotropy,the linear optical response exhibits strong linear dichroism as captured by the universal extinction ratio scaling law,Λi j=(vi/v j)^2(where i=j denotes the three spatial coordinates x,y,z,and vi is the i-direction Fermi velocity),which is independent of frequency,temperature,doping,and carrier scattering lifetime.For Cd3As2 and Na3Bi3,an exceptionally strong extinction ratio larger than 15 and covering a broad terahertz window is revealed.Our findings shed new light on the role of Fermi velocity anisotropy in the optical response of Dirac semimetals and open up novel polarization-sensitive functionalities,such as photodetection and light modulation.

戏里戏外,王志萍

在越剧的舞台上，人们记住了她塑造的一个个经典的角色，她是《红楼梦》里多情多愁的林黛玉，她是《追鱼》里追求自由、敢爱敢恨的鲤鱼精，她是《蝴蝶梦》里“只记缘来不记仇”的田秀，她是《双飞翼》里用爱与包容温暖着李商隐的王云雁……戏外，她是人们熟知和尊敬的王派传人王志萍。