Enhanced proximity effect in zigzag-shaped Majorana Josephson junctions

Abstract

High density superconductor-semiconductor-superconductor junctions have a small induced superconducting gap due to the quasiparticle trajectories with a large momentum parallel to the junction having a very long flight time. Because a large induced gap protects Majorana modes, these long trajectories constrain Majorana devices to a low electron density. We show that a zigzag-shaped geometry eliminates these trajectories, allowing the robust creation of Majorana states with both the induced gap $E_{\text{gap}}$ and the Majorana size ${\xi }_{\text{M}}$ improved by more than an order of magnitude for realistic parameters. In addition to the improved robustness of Majoranas, this new zigzag geometry is insensitive to the geometric details and the device tuning.

arXiv comment5 pages, 4 figures

References in corpus (23)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Helical liquids and Majorana bound states in quantum wires
• New directions in the pursuit of Majorana fermions in solid state systems
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Search for Majorana fermions in superconductors
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Kwant: a software package for quantum transport
• Introduction to topological superconductivity and Majorana fermions
• Superconductor-Nanowire Devices from Tunneling to the Multichannel Regime: Zero-Bias Oscillations and Magnetoconductance Crossover
• Quantized Majorana conductance
• Evidence of topological superconductivity in planar Josephson junctions
• Topological Superconductivity in a Phase-Controlled Josephson Junction
• Topological Superconductivity in a Planar Josephson Junction
• Two-dimensional platform for networks of Majorana bound states
• Local Density of States in a Dirty Normal Metal connected to a Superconductor
• Soft Superconducting Gap in Semiconductor Majorana Nanowires
• A road to reality with topological superconductors
• Orbital effect of magnetic field on the Majorana phase diagram
• The excitation spectrum of mesoscopic proximity structures
• Benefits of weak disorder in one dimensional topological superconductors
• Soft superconducting gap in semiconductor-based Majorana nanowires
• Phenomenology of soft gap, zero bias peak, and zero mode splitting in ideal Majorana nanowires

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• Non-local transport signatures of topological superconductivity in a phase-biased planar Josephson junction
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• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Disorder effects in planar semiconductor-superconductor structures: Majorana wires versus Josephson junctions
• Challenges in detecting topological superconducting transitions via supercurrent and phase probes in planar Josephson junctions
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