Massless Dirac-Weyl fermions in a T3 optical lattice

被引:180
|
作者
Bercioux, D. [1 ,2 ]
Urban, D. F. [2 ,3 ]
Grabert, H. [1 ,2 ]
Haeusler, W. [2 ,4 ]
机构
[1] Univ Freiburg, Freiburg Inst Adv Studies, D-79104 Freiburg, Germany
[2] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany
[3] Univ Autonoma Madrid, Fac Ciencias, Dept Fis Mat Condensada C 12, E-28049 Madrid, Spain
[4] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany
来源
PHYSICAL REVIEW A | 2009年 / 80卷 / 06期
关键词
PHYSICS; PHASE; GAS;
D O I
10.1103/PhysRevA.80.063603
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose an experimental setup for the observation of quasirelativistic massless fermions. It is based on a T-3 optical lattice, realized by three pairs of counterpropagating lasers, filled with fermionic cold atoms. We show that in the long wavelength approximation the T-3 Hamiltonian generalizes the Dirac-Weyl Hamiltonian for the honeycomb lattice, however, with a larger value of the pseudospin S=1. In addition to the Dirac cones, the spectrum includes a dispersionless branch of localized states producing a finite jump in the atomic density. Furthermore, implications for the Landau levels are discussed.
引用
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页数:4
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