Nematic Skyrmions in Odd-Parity Superconductors

被引：46
|
作者：
Zyuzin, A. A. [1 ,2 ]
Garaud, Julien [1 ]
Babaev, Egor [1 ]
机构：
[1] KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden
[2] Ioffe Phys Tech Inst, St Petersburg 194021, Russia
来源：
PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 16期
基金：
瑞典研究理事会;
关键词：
BREAKING; VORTICES; STATES;
D O I：
10.1103/PhysRevLett.119.167001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study topological excitations in two-component nematic superconductors, with a particular focus on CuxBi2Se3 as a candidate material. We find that the lowest-energy topological excitations are coreless vortices: a bound state of two spatially separated half-quantum vortices. These objects are nematic Skyrmions, since they are characterized by an additional topological charge. The inter-Skyrmion forces are dipolar in this model, i.e., attractive for certain relative orientations of the Skyrmions, hence forming multi-Skyrmion bound states.
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页数：6
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