Large zero bias peaks and dips in a four-terminal thin InAs-Al nanowire device

Abstract

We report electron transport studies of a thin InAs-Al hybrid semiconductor-superconductor nanowire device using a four-terminal design. Compared to previous works, thinner InAs nanowire (diameter less than 40 nm) is expected to reach fewer sub-band regime. The four-terminal device design excludes electrode contact resistance, an unknown value which has inevitably affected previously reported device conductance. Using tunneling spectroscopy, we find large zero-bias peaks (ZBPs) in differential conductance on the order of $2e^2/h$. Investigating the ZBP evolution by sweeping various gate voltages and magnetic field, we find a transition between a zero-bias peak and a zero-bias dip while the zero-bias conductance sticks close to $2e^2/h$. We discuss a topologically trivial interpretation involving disorder, smooth potential variation and quasi-Majorana zero modes.

Raw data and processing codes are available at http://doi.org/10.5281/zenodo.5111639

References in corpus (20)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Anomalous modulation of a zero bias peak in a hybrid nanowire-superconductor device
• Epitaxy of Semiconductor-Superconductor nanowires
• Scaling of Majorana Zero-Bias Conductance Peaks
• Hard gap in epitaxial semiconductor-superconductor nanowires
• Transport spectroscopy of NS nanowire junctions with Majorana fermions
• Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions
• A Majorana smoking gun for the superconductor-semiconductor hybrid topological system
• Ballistic superconductivity in semiconductor nanowires
• SNS junctions in nanowires with spin-orbit coupling: role of confinement and helicity on the sub-gap spectrum
• Disorder-induced zero-bias peaks in Majorana nanowires
• Role of dissipation in realistic Majorana nanowires
• Quantized and unquantized zero-bias tunneling conductance peaks in Majorana nanowires: Conductance below and above $2e^2/h$
• In Situ Epitaxy of Pure Phase Ultra-Thin InAs-Al Nanowires for Quantum Devices
• Partially-separated Majorana modes in a disordered medium
• Phenomenology of soft gap, zero bias peak, and zero mode splitting in ideal Majorana nanowires

Cited by in corpus (35)

• Estimating disorder and its adverse effects in semiconductor Majorana nanowires
• Plateau regions for zero-bias peaks within 5% of the quantized conductance value $2e^2/h$
• Selective area epitaxy of PbTe-Pb hybrid nanowires on a lattice-matched substrate
• Numerical study of PbTe-Pb hybrid nanowires for engineering Majorana zero modes
• On-demand large-conductance in trivial zero-bias tunneling peaks in Majorana nanowires
• Conductance Quantization in PbTe Nanowires
• Observation of Aharonov-Bohm effect in PbTe nanowire networks
• Proximity effect in PbTe-Pb hybrid nanowire Josephson junctions
• Ballistic PbTe Nanowire Devices
• Gatemon qubit based on a thin InAs-Al hybrid nanowire
• Hard superconducting gap in PbTe nanowires
• Differential current noise as an identifier of Andreev bound states that induce nearly quantized conductance plateaus
• Disordered Majorana nanowires: Studying disorder without any disorder
• Large Andreev bound state zero bias peaks in a weakly dissipative environment
• Effect of topological length on Bound states signatures in a Topological nanowire
• Random matrix theory for the robustness, quantization, and end-to-end correlation of zero-bias conductance peaks in a class D ensemble
• Gate-Compatible Circuit Quantum Electrodynamics in a Three-Dimensional Cavity Architecture
• Probing Majorana bound states through an inhomogeneous Andreev double dot interferometer
• SQUID oscillations in PbTe nanowire networks
• Vision transformer based Deep Learning of Topological indicators in Majorana Nanowires
• Reducing disorder in PbTe nanowires for Majorana research
• Double Fu-teleportation and anomalous Coulomb blockade in a Majorana-hosted superconducting island
• Lifshitz transitions and Weyl semimetals from a topological superconductor with supercurrent flow
• Quantized Andreev conductance in semiconductor nanowires
• In situ tuning of dynamical Coulomb blockade on Andreev bound states in hybrid nanowire devices
• Theoretical proposal to obtain strong Majorana evidence from scanning tunneling spectroscopy of a vortex with a dissipative environment
• Anisotropy of PbTe nanowires with and without a superconductor
• Properties of dissipative Floquet Majorana modes using a quantum dot
• Enhanced superconductivity in PbTe-In hybrids
• Majorana zero modes in semiconductor-superconductor hybrid structures: Defining topology in short and disordered nanowires through Majorana splitting
• Mitigating disorder and optimizing topological indicators with vision-transformer-based neural networks in Majorana nanowires
• Strong enhancement of g-factor in PbTe-Pb hybrid nanowires
• Influence of topological degeneracy on the boundary Berezinskii-Kosterlitz-Thouless quantum phase transition of a dissipative resonant level
• SNS Junctions along the BCS-BEC Crossover
• Coulomb blockade in open superconducting islands on InAs nanowires