Topological superconductivity in two dimensions with mixed chirality

被引：15
作者：
Black-Schaffer, A. M. [1 ]
Le Hur, K. [2 ]
机构：
[1] Uppsala Univ, Dept Phys & Astrophys, S-75120 Uppsala, Sweden
[2] Ecole Polytech, CNRS, Ctr Phys Theor, F-91128 Palaiseau, France
来源：
PHYSICAL REVIEW B | 2015年 / 92卷 / 14期
基金：
瑞典研究理事会; 美国国家科学基金会;
关键词：
MEAN-FIELD; GRAPHENE; INSULATORS; SYMMETRY; STATE; SPIN; ANTIFERROMAGNETISM; SYSTEMS; RVB;
D O I：
10.1103/PhysRevB.92.140503
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We find a mixed chirality d-wave superconducting state in the coexistence region between antiferromagnetism and interaction-driven superconductivity in lightly doped honeycomb materials. This state has a topological chiral d + id-wave symmetry in one Dirac valley but d - id-wave symmetry in the other valley and hosts two counterpropagating edge states, always protected in the absence of intervalley scattering. A first-order topological phase transition, with no bulk gap closing, separates the chiral d-wave state at small magnetic moments from the mixed chirality d-wave phase.
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页数：5
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