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.

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Cited by in corpus (34)

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• Distinguishing trivial and topological zero energy states in long nanowire junctions
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• Enhancement of Proximity Induced Superconductivity in a Planar Ge Hole Gas
• Strong coupling between a microwave photon and a singlet-triplet qubit
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• From Cooper pair splitting to the non-local spectroscopy of a Shiba state
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• Prevalence of trivial zero-energy sub-gap states in non-uniform helical spin chains on the surface of superconductors
• Mitigating disorder-induced zero-energy states in weakly-coupled semiconductor-superconductor hybrid systems
• 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
• Spin-filtered measurements of Andreev bound states
• 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
• Two types of dark solitons in a spin-orbit-coupled Fermi gas
• 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
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• Gate-tunable negative differential conductance in hybrid semiconductor-superconductor devices
• Confinement-induced zero-bias peaks in conventional superconductor hybrids