Topological Vortex Phase Transitions in Iron-Based Superconductors

Abstract

We study topological vortex phases in iron-based superconductors. Besides the previously known vortex end Majorana zero modes (MZMs) phase stemming from the existence of a three dimensional (3D) strong topological insulator state, we show that there is another topologically nontrivial phase as iron-based superconductors can be doped superconducting 3D weak topological insulators (WTIs). The vortex bound states in a superconducting 3D WTI exhibit two different types of quantum states, a robust nodal superconducting phase with pairs of bulk MZMs and a full-gap topologically nontrivial superconducting phase which has single vortex end MZM in a certain range of doping level. Moreover, we predict and summarize various topological phases in iron-based superconductors, and find that carrier doping and interlayer coupling can drive systems to have phase transitions between these different topological phases.

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Cited by in corpus (21)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Vortex and Surface Phase Transitions in Superconducting Higher-order Topological Insulators
• Vortex end Majorana zero modes in superconducting Dirac and Weyl semimetals
• Vortex-line topology in iron-based superconductors with and without second-order topology
• Topological Superconductivity in an s-wave Superconductor and Its Implication to Iron-based Superconductors
• Competing Vortex Topologies in Iron-based Superconductors
• Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors
• Boundary Topological Superconductors
• Emergent vortex Majorana zero mode in iron-based superconductors
• Surface Bogoliubov-Dirac cones and helical Majorana hinge modes in superconducting Dirac semimetals
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• Superconductor Vortex Spectrum Including Fermi Arc States in Time-Reversal Symmetric Weyl Semimetals
• Majorana Flat Bands in the Vortex Line of Superconducting Weyl Semimetals
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• Majorana Zero Modes and Topological Nature in Bi2Ta3S6-family Superconductors
• Nodal Line Topological Superfluid and Multiply Protected Majorana Fermi Arc in a Three-Dimensional Time-Reversal-Invariant Superfluid Model