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所属单位：理学院

发表刊物：PHYSICAL REVIEW B

关键字：WEYL FERMION SEMIMETAL DIRAC SEMIMETAL INSULATORS PHASE METAL SUPERCONDUCTORS TRANSITION DISCOVERY CD3AS2 BANDS

摘要：Topological nodal line semimetals are characterized by the crossing of the conduction and valence bands along one or more closed loops in the Brillouin zone. Usually, these loops are either isolated or touch each other at some highly symmetric points. Here, we introduce a different kind of nodal line semimetal, that contains a pair of linked nodal loops. A concrete two-band model was constructed, which supports a pair of nodal lines with a double-helix structure, which can be further twisted into a Hopf link because of the periodicity of the Brillouin zone. The nodal lines are stabilized by the combined spatial inversion P and time reversal T symmetry; the individual P and T symmetries must be broken. The band exhibits nontrivial topology that each nodal loop carries a pi Berry flux. Surface flatbands emerge at the open boundary and are exactly encircled by the projection of the nodal lines on the surface Brillouin zone. The experimental implementation of our model using cold atoms in optical lattices is discussed.

ISSN号：2469-9950

是否译文：否

发表时间：2017-07-05

合写作者：Lu, Hai-Zhou,Hou, Jing-Min

通讯作者：陈伟,Hou, Jing-Min