Selective area epitaxy of PbTe-Pb hybrid nanowires on a lattice-matched substrate

Abstract

Topological quantum computing is based on braiding of Majorana zero modes encoding topological qubits. A promising candidate platform for Majorana zero modes is semiconductor-superconductor hybrid nanowires. The realization of topological qubits and braiding operations requires scalable and disorder-free nanowire networks. Selective area growth of in-plane InAs and InSb nanowires, together with shadow-wall growth of superconductor structures, have demonstrated this scalability by achieving various network structures. However, the noticeable lattice mismatch at the nanowire-substrate interface, acting as a disorder source, imposes a serious obstacle along with this roadmap. Here, combining selective area and shadow-wall growth, we demonstrate the fabrication of PbTe-Pb hybrid nanowires - another potentially promising Majorana system - on a nearly perfectly lattice-matched substrate CdTe, all done in one molecular beam epitaxy chamber. Transmission electron microscopy shows the single-crystal nature of the PbTe nanowire and its atomically sharp and clean interfaces to the CdTe substrate and the Pb overlayer, without noticeable inter-diffusion or strain. The nearly ideal interface condition, together with the strong screening of charge impurities due to the large dielectric constant of PbTe, hold promise towards a clean nanowire system to study Majorana zero modes and topological quantum computing.

19 pages, 4+7 figures

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Cited by in corpus (25)

• Plateau regions for zero-bias peaks within 5% of the quantized conductance value $2e^2/h$
• Numerical study of PbTe-Pb hybrid nanowires for engineering Majorana zero modes
• Large even-odd spacing and $g$-factor anisotropy in PbTe quantum dots
• Recent progress on Majorana in semiconductor-superconductor heterostructures--Engineering and detection
• Conductance Quantization in PbTe Nanowires
• Proximity effect in PbTe-Pb hybrid nanowire Josephson junctions
• Observation of Aharonov-Bohm effect in PbTe nanowire networks
• Ballistic PbTe Nanowire Devices
• Selective-Area-Grown PbTe-Pb Planar Josephson Junctions for Quantum Devices
• Hard superconducting gap in PbTe nanowires
• Large Andreev bound state zero bias peaks in a weakly dissipative environment
• Gate-tunable subband degeneracy in semiconductor nanowires
• SQUID oscillations in PbTe nanowire networks
• Reducing disorder in PbTe nanowires for Majorana research
• Gate-tunable Superconductivity in Hybrid InSb-Pb Nanowires
• Scalable and Tunable In-Plane Ge/Si(001) Nanowires Grown by Molecular Beam Epitaxy
• Dressed Majorana fermion in a hybrid nanowire
• Quantized Andreev conductance in semiconductor nanowires
• Anisotropy of PbTe nanowires with and without a superconductor
• Enhanced superconductivity in PbTe-In hybrids
• Ab initio study of Proximity-Induced Superconductivity in PbTe/Pb heterostructures
• Strong enhancement of g-factor in PbTe-Pb hybrid nanowires
• Versatile strain relief pathways in epitaxial films of (001)-oriented PbSe on III-V substrates
• Presence versus absence of charging energies in PbTe quantum dots
• Excess photon-assisted noise of Majorana and Andreev bound states