Effective response theory for zero-energy Majorana bound states in three spatial dimensions

Article

关键词: QUANTUM HALL STATES;    TOPOLOGICAL INSULATORS;    THERMAL TRANSPORT;   

DOI  :  10.1103/PhysRevB.91.184111

来源: SCIE

【 摘 要 】

We propose a gravitational response theory for point defects (hedgehogs) binding Majorana zero modes in (3 + 1)-dimensional superconductors. Starting in 4 + 1 dimensions, where the point defect is extended into a line, a coupling of the bulk defect texture with the gravitational field is introduced. Diffeomorphism invariance then leads to an SU(2)(2) Kac-Moody current running along the defect line. The SU(2)(2) Kac-Moody algebra accounts for the non-Abelian nature of the zero modes in 3 + 1 dimensions. It is then shown to also encode the angular momentum density which permeates throughout the bulk between hedgehog-antihedgehog pairs.

【 授权许可】

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