Formation and detection of Majorana modes in quantum spin Hall trenches

Abstract

We propose a novel realization for a topologically superconducting phase hosting Majorana zero-modes on the basis of quantum spin Hall systems. Remarkably, our proposal is completely free of ferromagnets. Instead, we confine helical edge states around a narrow defect line of finite length in a two-dimensional topological insulator. We demonstrate the formation of a new topological regime, hosting protected Majorana modes in the presence of s-wave superconductivity and Zeeman coupling. Interestingly, when the system is weakly tunnel-coupled to helical edge state reservoirs, a particular transport signature is associated with the presence of a non-Abelian Majorana zero-mode.

arXiv comment8 pages, 7 figures + Supp. Mat

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• Majorana bound states in semiconducting nanostructures
• Helical Liquids in Semiconductors
• Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
• Emerging topological bound states in Haldane model zigzag nanoribbons
• Thermodynamics in topological Josephson junctions
• Tomonaga Luttinger liquid in the topological edge channel of multilayer FeSe
• Reconstruction-Induced ${\phi }_0$ Josephson Effect in Quantum Spin Hall Constrictions
• Fraunhofer pattern in the presence of Majorana zero modes
• Charging a Dimerized Quantum XY Chain
• Spin-resolved spectroscopy of helical Andreev bound states
• Assessing bound states in a one-dimensional topological superconductor: Majorana versus Tamm
• Effects of the Vertices on the Topological Bound States in a Quasicrystalline Topological Insulator
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• Few-body precursors of topological frustration
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• Spin responses of a disordered helical superconducting edge under Zeeman field
• Limits of Thermal Conductance Quantization in Chiral Topological Josephson Junctions