Suppressing Andreev bound state zero bias peaks using a strongly dissipative lead

Abstract

Hybrid semiconductor-superconductor nanowires are predicted to host Majorana zero modes, manifested as zero-bias peaks (ZBPs) in tunneling conductance. ZBPs alone, however, are not sufficient evidence due to the ubiquitous presence of Andreev bound states in the same system. Here, we implement a strongly resistive normal lead in our InAs-Al nanowire devices and show that most of the expected ZBPs, corresponding to zero-energy Andreev bound states, can be suppressed, a phenomenon known as environmental Coulomb blockade. Our result is the first experimental demonstration of this dissipative interaction effect on Andreev bound states and can serve as a possible filter to narrow down ZBP phase diagram in future Majorana searches.

Raw data and processing codes within this paper are available at https://doi.org/10.5281/zenodo.5630076

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• Non-hermitian topology in multiterminal superconducting junctions
• Hard superconducting gap in PbTe nanowires
• Differential current noise as an identifier of Andreev bound states that induce nearly quantized conductance plateaus
• Large Andreev bound state zero bias peaks in a weakly dissipative environment
• Transport features of a topological superconducting nanowire with a quantum dot: conductance and noise
• Topologically nontrivial and trivial zero modes in chiral molecules
• Exceptional Andreev spectrum and supercurrent in p-wave non-Hermitian Josephson junctions
• Theoretical proposal to obtain strong Majorana evidence from scanning tunneling spectroscopy of a vortex with a dissipative environment
• In situ tuning of dynamical Coulomb blockade on Andreev bound states in hybrid nanowire devices
• Influence of topological degeneracy on the boundary Berezinskii-Kosterlitz-Thouless quantum phase transition of a dissipative resonant level
• Coulomb blockade in open superconducting islands on InAs nanowires