从对称性上来看,BCS极限的物理可以由洛伦兹不变性来描述,而相反的BEC极限,系统的对称性是伽利略平移不变性。在多体物理中,具有洛伦兹不变性的系统,当发生自发对称破缺的时候,会伴随希格斯模式的产生,而在伽利略平移对称性的系统中,并不会有希格斯模式的激发。因此,在这个BCS倒BEC过渡的图像下,使得我们可以探索希格斯模式...
BEC-BCS过渡在超冷费米原子中的实现是近年来冷原子领域的热点之一.BEC-BCS过渡的概念最早起源于对高温超导体系的研究.大家都知道,在高温超导材料的相图中,存在着一些无法用传统超导理论解释的区域.其中最受大家关注的就是所谓"赝能隙"区.即在欠掺杂区域中,在超导转变温度以上很大的温度范围内,系统的单粒子激发存在...
BCS-BEC过渡 1. Since then, Bardeen-Cooper-Schri effer (BCS) condensation of feimionic atoms and Bose-Einstein condensation(BEC) of diatomic molecules of these atoms as well as the BCS-BEC crossover regimes have stimulated a great interest. 从那时开始,人们不仅对Bardeen-Cooper-Schrieffer(BCS)...
BCS-BEC过渡 1. Since then, Bardeen-Cooper-Schri effer (BCS) condensation of feimionic atoms and Bose-Einstein condensation(BEC) of diatomic molecules of these atoms as well as theBCS-BEC crossoverregimes have stimulated a great interest. ...