Controlled Growth and Disorder Mitigation of GaAs1-xSbx/InAs Core-Shell Quantum Wires

Abstract

We report the growth and transport properties of GaAs1-xSbx/InAs core-shell nanowires. Compared with the well-studied GaAs-InAs system, incorporating Sb substantially reduces the lattice mismatch between the core and shell. Accordingly, both the nanowire crystal quality and device performance improved significantly. Increasing x from 0.15 to 0.35, the density of crystalline defects, such as stacking faults in the InAs shell, decreases by half. Moreover, the field-effect mobility increases from 3850 cm2/Vs to 4800 cm2/Vs, consistent with the reduction of the lattice mismatch. The incorporation of Sb makes the nanowire easier to pinch off via the gate voltage, enhancing the electric field tunability over the nanowire. Magneto-conductance measurements reveal Aharonov-Bohm-like oscillations, suggesting a phase-coherent tubular InAs shell. Our results identify lattice mismatch as a critical disorder source in core-shell nanowires and provide a practical route toward low-disorder core-shell quantum devices.

arXiv comment44 pages,16 figures

References in corpus (18)

• 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
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Epitaxy of Semiconductor-Superconductor nanowires
• Topological superconductivity in full shell proximitized nanowires
• Flux-induced topological superconductivity in full-shell nanowires
• Flux-induced Majorana modes in full-shell nanowires
• Towards high mobility InSb nanowire devices
• Epitaxial Pb on InAs nanowires
• Plateau regions for zero-bias peaks within 5% of the quantized conductance value $2e^2/h$
• In Situ Epitaxy of Pure Phase Ultra-Thin InAs-Al Nanowires for Quantum Devices
• Observation of Aharonov-Bohm effect in PbTe nanowire networks
• Microwave-assisted unidirectional superconductivity in Al-InAs nanowire-Al junctions under magnetic fields
• Reducing disorder in PbTe nanowires for Majorana research
• Fluxoid valve effect in full-shell nanowire Josephson junctions
• Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations in the quasi-ballistic regime in phase-pure GaAs/InAs core/shell nanowires
• Interplay between Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations in phase-pure GaAs/InAs core/shell nanowires of different lengths