Dislocation Majorana bound states in iron-based superconductors.

ABSTRACT: We show that lattice dislocations of topological iron-based superconductors such as FeTe_1-xSe_x will intrinsically trap non-Abelian Majorana quasiparticles, in the absence of any external magnetic field. Our theory is motivated by the recent experimental observations of normal-state weak topology and surface magnetism that coexist with superconductivity in FeTe_1-xSe_x, the combination of which naturally achieves an emergent second-order topological superconductivity in a two-dimensional subsystem spanned by screw or edge dislocations. This exemplifies a new embedded higher-order topological phase in class D, where Majorana zero modes appear around the "corners" of a low-dimensional embedded subsystem, instead of those of the full crystal. A nested

SUBMITTER: Hu LH 

PROVIDER: S-EPMC10943028 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature