排序方式: 共有9条查询结果,搜索用时 15 毫秒
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近来,关于无序涡旋物质凝聚体的著名的涡旋玻璃理论受到了来自某些新实验的严重质疑.我们重新审查了高温超导体的临界标度,发现超导混合态的直流伏安特性具有扩展幂律的一般形式.由该扩展幂律型非线性方程模拟的等温线和Strachan等人得到的实验数据[Phys.Rev.Lett.87(2001),067007]符合得很好.文中还讨论了长期以来围绕纵向电阻率和霍尔电阻率的临界指数的某些争议. 相似文献
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Starting from the free energy of a moving vortex, we obtain the extended power law form of longitudinal resistivity pxx and the analytical form of Hall resistivity pxy.Based on them, we obtain a scaling relation which agrees well with the experimental data of different kinds of high-temperature superconductors. Furthermore, the theoretical results well fit the scaling results. 相似文献
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当前在冷原子和玻色爱因斯坦凝聚(BEC)领域的一个重要问题是在Feshbach共振附近的冷费米气体如何从BEC态演变到BCS(Bardeen Schrieffer Cooper)态.本文进一步研究在Feshbach共振附近超流态的相滑移现象.通过具体的数值计算,给出了费米气体在相滑移时的粒子数密度的分布,并对不同温度下的相滑移的大小进行了分析.结果表明,相滑移现象可以作为实验上判断系统是否处于超流态的一个可行的判据.
关键词:
超流费米气体
相滑移
Feshbach共振 相似文献
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In view of the question about the vortex glass theory of the freezing of disordered vortex matter raised by recent experimental observations, we reinvestigate the critical scaling of high Tc superconductors. It is found that the dc current-voltage characteristic of mixed state superconductors has a general form of extended power law which is based on the Ginzburg-Landau (GL) functional in the similar way as the vortex glass theory. Isotherms simulated from this nonlinear equation fit the experimental I- V data of Strachan et al. [Phys. Rev. Left. 87(2001) 067007]. The puzzling question of the derivative plot for the I - V curves and the controversy surrounding the values of critical exponents are discussed. 相似文献
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玻色-爱因斯坦凝聚领域Feshbach共振现象研究进展 总被引:1,自引:0,他引:1
Feshbach共振现象是当前玻色一爱因斯坦凝聚领域中的一个研究热点.目前在大多数低温碱金属原子气体里都已观测到Feshbach共振现象.在实验里利用Feshbach共振可以任意改变这些系统中原子之间的相互作用强度,从强相互排斥作用到强相互吸引作用都可以实现.文章详细介绍Feshbach共振现象以及目前它在原子气体系统里的最重要的两个应用,研究费米子气体里的超流态和有强相互作用的玻色子气体. 相似文献
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Stabilized by quantum fluctuations, dipolar Bose–Einstein condensates can form self-bound liquid-like droplets.However in the Bogoliubov theory, there are imaginary phonon energies in the long-wavelength limit, implying dynamical instability of this system. A similar instability appears in the Bogoliubov theory of a binary quantum droplet, and is removed due to higher-order quantum fluctuations as shown recently [Gu Q and Yin L 2020 Phys.Rev. B 102 220503(R)]. We study the excitation energy of a... 相似文献
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