Helical Majorana edge mode in a superconducting antiferromagnetic quantum spin Hall insulator

Abstract

A two-dimensional time-reversal symmetric topological superconductor is a fully gapped system possessing a helical Majorana mode on the edges. This helical Majorana edge mode (HMEM), which is a Kramer's pair of two chiral Majorana edge modes in the opposite propagating directions, is robust under time-reversal symmetry protection. We propose a feasible setup and accessible measurement to provide the preliminary step of the HMEM realization by studying superconducting antiferromagnetic quantum spin Hall insulators. Since this antiferromagnetic topological insulator hosts a helical electron edge mode and preserves effective time-reversal symmetry, which is the combination of time-reversal symmetry and crystalline symmetry, the proximity effect of the conventional s-wave superconducting pairing can directly induce a single HMEM. We further show the HMEM leads to the observation of an $e^2/h$ conductance, and this quantized conductance survives even in the presence of small symmetry-breaking disorders.

6 pages, 4 figures, 4 pages of supplementary material

References in corpus (21)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Topological Insulators with Inversion Symmetry
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Topological Field Theory of Time-Reversal Invariant Insulators
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Topological Defects and Gapless Modes in Insulators and Superconductors
• The Quantum Spin Hall Effect: Theory and Experiment
• Anomalous modulation of a zero bias peak in a hybrid nanowire-superconductor device
• Antiferromagnetic topological insulators
• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• Chiral Majorana edge state in a quantum anomalous Hall insulator-superconductor structure
• Classification of reflection symmetry protected topological semimetals and nodal superconductors
• Magnonic topological insulators in antiferromagnets
• A mechanism of $\frac{e^2}{2h}$ conductance plateau without 1D chiral Majorana fermions
• Disorder-induced half-integer quantized conductance plateau in quantum anomalous Hall insulator-superconductor structures
• Electrically tunable topological superconductivity and Majorana fermions in two dimensions
• DIII Topological Superconductivity with Emergent Time-Reversal Symmetry

Cited by in corpus (10)

• Topological Superconductivity in Two-Dimensional Altermagnetic Metals
• Intrinsic Time-reversal-invariant Topological Superconductivity in Thin Films of Iron-based Superconductors
• Hierarchy of higher-order topological superconductors in three dimensions
• Splitting the hinge mode of higher-order topological insulators
• Majorana corner modes with solitons in an attractive Hubbard-Hofstadter model of cold atom optical lattices
• Quantum Computing with Majorana Kramers Pairs
• Majorana Doublets, Flat Bands, and Dirac Nodes in s-Wave Superfluids
• Ferroelectric topological superconductor
• Experimental realization of Majorana hinge and corner modes in intrinsic organic topological superconductor without magnetic field at room temperature
• Chiral Majorana Fermions in two dimensional square lattice antiferromagnet with proximity-induced superconductivity