Zitterbewegung for ultracold atoms in the merging of Dirac points

doi:10.1103/PhysRevA.91.023623

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	Zitterbewegung for ultracold atoms in the merging of Dirac points
	Li, Zhi ; Cao, Hui ; Fu, Li-Bin
刊名	physical review a
	2015
关键词	QUANTUM PHASE-TRANSITION FERMIONS GRAPHITE GRAPHENE LATTICES GASES
DOI	10.1103/PhysRevA.91.023623
英文摘要	We investigate Zitterbewegung (ZB) of the ultracold atoms in a tunable honeycomb optical lattice. By tuning the parameters of the lattice one can realize the merging of two Dirac points. The process of two Dirac points merging into a hybrid point implies a topological phase transition from a semimetallic to a band insulator phase. After merging, it presents a linear-quadratic dispersion relation which is linear in one direction and quadric in the other orthogonal direction. We show that ZB occurs isotropically before merging but occurs only in the direction of the linear dispersion after merging. Furthermore, we obtain that ZB is exponentially damping for a negative energy gap but is a stable oscillation for a positive energy gap. The frequency and amplitude of ZB can be controlled in a detectable range, so the phenomena can be observable in the ultracold atomic experiments.; Optics; Physics, Atomic, Molecular & Chemical; SCI(E); EI; 0; ARTICLE; huicao.huicao@gmail.com; lbfu@iapcm.ac.cn; 2; 91
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/386104]
专题	工学院
推荐引用方式 GB/T 7714	Li, Zhi,Cao, Hui,Fu, Li-Bin. Zitterbewegung for ultracold atoms in the merging of Dirac points[J]. physical review a,2015.
APA	Li, Zhi,Cao, Hui,&Fu, Li-Bin.(2015).Zitterbewegung for ultracold atoms in the merging of Dirac points.physical review a.
MLA	Li, Zhi,et al."Zitterbewegung for ultracold atoms in the merging of Dirac points".physical review a (2015).