Single-shot fabrication of semiconducting-superconducting nanowire devices

Abstract

Semiconducting-superconducting nanowires attract widespread interest owing to the possible presence of non-abelian Majorana zero modes, which hold promise for topological quantum computation. However, the search for Majorana signatures is challenging because reproducible hybrid devices with desired nanowire lengths and material parameters need to be reliably fabricated to perform systematic explorations in gate voltages and magnetic fields. Here, we exploit a fabrication platform based on shadow walls that enables the in-situ, selective and consecutive depositions of superconductors and normal metals to form normal-superconducting junctions. Crucially, this method allows to realize devices in a single shot, eliminating fabrication steps after the synthesis of the fragile semiconductor/superconductor interface. At the atomic level, all investigated devices reveal a sharp and defect-free semiconducting-superconducting interface and, correspondingly, we measure electrically a hard induced superconducting gap. While our advancement is of crucial importance for enhancing the yield of complex hybrid devices, it also offers a straightforward route to explore new material combinations for hybrid devices.

References in corpus (13)

• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Epitaxy of Semiconductor-Superconductor nanowires
• Scaling of Majorana Zero-Bias Conductance Peaks
• Hard gap in epitaxial semiconductor-superconductor nanowires
• Majorana box qubits
• Ballistic superconductivity in semiconductor nanowires
• Braiding without Braiding: Teleportation-Based Quantum Information Processing with Majorana Zero Modes
• Disorder-induced zero-bias peaks in Majorana nanowires
• Andreev rectifier: a nonlocal conductance signature of topological phase transitions
• Quantized and unquantized zero-bias tunneling conductance peaks in Majorana nanowires: Conductance below and above $2e^2/h$
• Dimensional crossover in spin-orbit-coupled semiconductor nanowires with induced superconducting pairing
• Transmission phase read-out of a large quantum dot in a nanowire interferometer
• Toward durable Al-InSb hybrid heterostructures via epitaxy of 2ML interfacial InAs screening layers

Cited by in corpus (15)

• Realization of a minimal Kitaev chain in coupled quantum dots
• Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires
• Shadow-wall lithography of ballistic superconductor-semiconductor quantum devices
• Controlled crossed Andreev reflection and elastic co-tunneling mediated by Andreev bound states
• Robust poor man's Majorana zero modes using Yu-Shiba-Rusinov states
• Hard superconducting gap in germanium
• Electrostatic control of the proximity effect in the bulk of semiconductor-superconductor hybrids
• Parametric exploration of zero-energy modes in three-terminal InSb-Al nanowire devices
• Spin-filtered measurements of Andreev bound states
• Impact of junction length on supercurrent resilience against magnetic field in InSb-Al nanowire Josephson junctions
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Subgap transport in superconductor--semiconductor hybrid islands: Weak and strong coupling regimes
• SQUID oscillations in PbTe nanowire networks
• Signatures of Majorana bound states in scanning gate microscopy of hybrid nanowires
• Impact of spin-orbit coupling and Zeeman interaction on the multiple Andreev reflections subharmonic gap structure in nanoscopic Josephson junctions