Quantum impurity spin in Majorana edge fermions

被引：44
|
作者：
Shindou, Ryuichi [1 ]
Furusaki, Akira [1 ]
Nagaosa, Naoto [2 ,3 ,4 ]
机构：
[1] RIKEN, Condensed Matter Theory Lab, Wako, Saitama 3510198, Japan
[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[3] RIKEN, CMRG, Wako, Saitama 3510198, Japan
[4] RIKEN, CERG, Wako, Saitama 3510198, Japan
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 18期
关键词：
DISSIPATIVE 2-STATE SYSTEM; TOPOLOGICAL INSULATORS; SUPERCONDUCTORS; DYNAMICS;
D O I：
10.1103/PhysRevB.82.180505
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We show that Majorana edge modes of two-dimensional spin-triplet topological superconductors (superfluids) have Ising-type spin density whose direction is determined by the d-vector characterizing the spin-triplet pairing symmetry. Exchange coupling between an impurity spin (S=1/2) and Majorana edge modes is thus Ising-type. Under external magnetic field perpendicular to the Ising axis, the system can be mapped to a two-level system with Ohmic dissipation, which is equivalent to the anisotropic Kondo model. The magnetic response of the impurity spin can serve as a local experimental probe for the order parameter.
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页数：4
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