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Article overview
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Competing Vortex Topologies in Iron-based Superconductors | | Lun-Hui Hu
; Xianxin Wu
; Chao-Xing Liu
; Rui-Xing Zhang
; | | Date: |
21 Oct 2021 | | Abstract: | In this work, we establish a new theoretical paradigm for vortex Majorana
physics in the recently discovered topological iron-based superconductors
(tFeSCs). While tFeSCs are widely accepted as an exemplar of topological
insulators (TIs) with intrinsic superconductivity, our theory implies that such
common belief could be oversimplified. Our main finding is that the
normal-state bulk Dirac nodes, usually ignored in TI-based vortex Majorana
theories for tFeSCs, will play a key role of determining the vortex state
topology. In particular, the interplay between TI and Dirac nodal bands will
lead to multiple competing topological phases for a superconducting vortex line
in tFeSCs, including an unprecedented hybrid topological vortex state that
carries both Majorana bound states and a gapless dispersion. Remarkably, this
exotic hybrid vortex phase generally exists in the vortex phase diagram for our
minimal model for tFeSCs and is directly relevant to tFeSC candidates such as
LiFeAs. In the presence of lattice symmetry breaking, the hybrid vortex gets
topologically trivialized and becomes Majorana-free, which naturally explains
the puzzle of ubiquitous trivial vortices observed in LiFeAs. Origin of
Majorana signal in other tFeSC candidates such as FeTe$_x$Se$_{1-x}$ and
CaKFe$_4$As$_4$ are also interpreted within our theory framework. Our theory
sheds new light on theoretically understanding and experimentally engineering
Majorana physics in high-temperature iron-based systems. | | Source: | arXiv, 2110.11357 | | Services: | Forum | Review | PDF | Favorites | |
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