Table 1 Summary of topological physics at each level of the dMBS theory in general s-wave superconductors

From: Dislocation Majorana bound states in iron-based superconductors

 

Normal state

Bulk SC states

Surface SC states

Dislocations

Dimension

3D

3D

2D

2D

Symmetry Class

AII

DIII

D

D

Topology

weak index

trivial

BdG Chern number

ET2

Origins

band inversions

s-wave singlet pairing

Eq. (1)

Eq. (1) and Eq. (3)

Boundary Physics

Dirac surface states

none

chiral Majorana hinge modes

dMBSs

  1. SC superconductor, ET2 embedded second-order topological phase, dMBSs dislocation Majorana bound states.
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