Magnetic field independent sub-gap states in hybrid Rashba nanowires

Abstract

Sub-gap states in semiconducting-superconducting nanowire hybrid devices are controversially discussed as potential topologically non-trivial quantum states. One source of ambiguity is the lack of an energetically and spatially well defined tunnel spectrometer. Here, we use quantum dots directly integrated into the nanowire during the growth process to perform tunnel spectroscopy of discrete sub-gap states in a long nanowire segment. In addition to sub-gap states with a standard magnetic field dependence, we find topologically trivial sub-gap states that are independent of the external magnetic field, i.e. that are pinned to a constant energy as a function of field. We explain this effect qualitatively and quantitatively by taking into account the strong spin-orbit interaction in the nanowire, which can lead to a decoupling of Andreev bound states from the field due to a spatial spin texture of the confined eigenstates.

References in corpus (11)

• Non-Abelian Anyons and Topological Quantum Computation
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
• Spin-Orbit Mediated Control of Spin Qubits
• Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
• Tuning Yu-Shiba-Rusinov States in a Quantum Dot
• Transport Measurement of Andreev Bound States in a Kondo-Correlated Quantum Dot
• Topological Phase Detection in Rashba Nanowires with a Quantum Dot
• Spectroscopy of the superconducting proximity effect in nanowires using integrated quantum dots

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• Recent progress on Majorana in semiconductor-superconductor heterostructures--Engineering and detection
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• Prevalence of trivial zero-energy sub-gap states in non-uniform helical spin chains on the surface of superconductors
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• Robust topological superconductivity in weakly coupled nanowire-superconductor hybrid structures
• Nonlocal measurement of quasiparticle charge and energy relaxation in proximitized semiconductor nanowires using quantum dots
• Large Andreev bound state zero bias peaks in a weakly dissipative environment
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• Intermediate states in Andreev bound state fusion
• Majorana bound states in topological insulators with hidden Dirac points
• Supercurrent transport through 1$e$-periodic full-shell Coulomb islands
• Spectroscopy of the local density-of-states in nanowires using integrated quantum dots
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• Enhanced $2\pi$-periodic Aharonov-Bohm Effect as a Signature of Majorana Zero Modes Probed by Nonlocal Measurements
• Fate of the superconducting state in floating islands of hybrid nanowire devices
• Richardson model with complex level structure and spin-orbit coupling for hybrid superconducting islands: stepwise suppression of pairing and magnetic pinning
• Spin Signature of Majorana Fermions in Topological Nodal-Point Superconductors
• Spin-resolved nonlocal transport in proximitized Rashba nanowires
• Gate-tunable negative differential conductance in hybrid semiconductor-superconductor devices
• Confinement-induced zero-bias peaks in conventional superconductor hybrids