Quantized Andreev conductance in semiconductor nanowires

Abstract

Clean one-dimensional electron systems can exhibit quantized conductance. The plateau conductance doubles if the transport is dominated by Andreev reflection. Here, we report quantized conductance observed in both Andreev and normal-state transports in PbTe-Pb and PbTe-In hybrid nanowires. The Andreev plateau is observed at $4e^2/h$, twice of the normal plateau value of $2e^2/h$. In comparison, Andreev conductance in the best-optimized III-V nanowires is non-quantized due to mode-mixing induced dips (a disorder effect), despite the quantization of normal-state transport. The negligible mode mixing in PbTe hybrids indicates an unprecedented low-disorder transport regime for nanowire devices, beneficial for Majorana researches.

References in corpus (47)

• 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
• Kwant: a software package for quantum transport
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Epitaxy of Semiconductor-Superconductor nanowires
• Zero-bias peaks in spin-orbit coupled superconducting wires with and without Majorana end-states
• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
• 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
• Ballistic Majorana nanowire devices
• Realization of a minimal Kitaev chain in coupled quantum dots
• Quantum point contact as a probe of a topological superconductor
• Ballistic superconductivity in semiconductor nanowires
• Physical mechanisms for zero-bias conductance peaks in Majorana nanowires
• InAs-Al Hybrid Devices Passing the Topological Gap Protocol
• Quantized conductance doubling and hard gap in a two-dimensional semiconductor-superconductor heterostructure
• Next steps of quantum transport in Majorana nanowire devices
• Disorder-induced zero-bias peaks in Majorana nanowires
• Hard superconducting gap in InSb nanowires
• Conductance Quantization at zero magnetic field in InSb nanowires
• Estimating disorder and its adverse effects in semiconductor Majorana nanowires
• Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires
• Orbital effect of magnetic field on the Majorana phase diagram
• Theory of Majorana zero modes in unconventional superconductors
• Shadow-wall lithography of ballistic superconductor-semiconductor quantum devices
• Plateau regions for zero-bias peaks within 5% of the quantized conductance value $2e^2/h$
• Large zero bias peaks and dips in a four-terminal thin InAs-Al nanowire device
• 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
• In Situ Epitaxy of Pure Phase Ultra-Thin InAs-Al Nanowires for Quantum Devices
• Suppression of the overlap between Majorana fermions by orbital magnetic effects in semiconducting-superconducting nanowires
• Partially-separated Majorana modes in a disordered medium
• Spectral properties, topological patches, and effective phase diagrams of finite disordered Majorana nanowires
• Large even-odd spacing and $g$-factor anisotropy in PbTe quantum dots
• Split-Channel Ballistic Transport in an InSb Nanowire
• Conductance Quantization in PbTe Nanowires
• Ballistic PbTe Nanowire Devices
• Proximity effect in PbTe-Pb hybrid nanowire Josephson junctions
• Observation of Aharonov-Bohm effect in PbTe nanowire networks
• Selective-Area-Grown PbTe-Pb Planar Josephson Junctions for Quantum Devices
• Hard superconducting gap in PbTe nanowires
• Evidence for $\pi$-shifted Cooper quartets and few-mode transport in PbTe nanowire three-terminal Josephson junctions
• Gate-tunable subband degeneracy in semiconductor nanowires
• SQUID oscillations in PbTe nanowire networks
• Reducing disorder in PbTe nanowires for Majorana research

Cited by in corpus (3)

• Strong enhancement of g-factor in PbTe-Pb hybrid nanowires
• Excess photon-assisted noise of Majorana and Andreev bound states
• Presence versus absence of charging energies in PbTe quantum dots