Geometrically protected triple-point crossings in an optical lattice

被引：24

作者：

Fulga, I. C. ^{[1
]}

Fallani, L. ^{[2
,3
]}

Burrello, M. ^{[4
,5
]}

机构：

[1] IFW Dresden, Inst Theoret Solid State Phys, D-01171 Dresden, Germany

[2] Univ Florence, Dept Phys & Astron, I-50019 Sesto Fiorentino, Italy

[3] LENS European Lab Nonlinear Spect, I-50019 Sesto Fiorentino, Italy

[4] Univ Copenhagen, Niels Bohr Int Acad, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark

[5] Univ Copenhagen, Ctr Quantum Devices, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW B | 2018年 / 97卷 / 12期

基金：

欧洲研究理事会;

关键词：

FERMIONS;

D O I：

10.1103/PhysRevB.97.121402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show how to realize topologically protected crossings of three energy bands, integer-spin analogs of Weyl fermions, in three-dimensional optical lattices. Our proposal only involves ultracold atom techniques that have already been experimentally demonstrated and leads to isolated triple-point crossings (TPCs) which are required to exist by a novel combination of lattice symmetries. The symmetries also allow for a new type of topological object, the type-II, or tilted, TPC. Our Rapid Communication shows that spin-1 Weyl points, which have not yet been observed in the band structure of crystals, are within reach of ultracold atom experiments.

引用

页数：5

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