Engineering Hybrid Epitaxial InAsSb/Al Nanowire Materials for Stronger Topological Protection

Abstract

The combination of strong spin-orbit coupling, large $g$-factors, and the coupling to a superconductor can be used to create a topologically protected state in a semiconductor nanowire. Here we report on growth and characterization of hybrid epitaxial InAsSb/Al nanowires, with varying composition and crystal structure. We find the strongest spin-orbit interaction at intermediate compositions in zincblende InAs${}_{1-x}$Sb${}_x$ nanowires, exceeding that of both InAs and InSb materials, confirming recent theoretical studies \cite{winkler2016topological}. We show that the epitaxial InAsSb/Al interfaces allows for a hard induced superconducting gap and 2$e$ transport in Coulomb charging experiments, similar to experiments on InAs/Al and InSb/Al materials, and find measurements consistent with topological phase transitions at low magnetic fields due to large effective $g$-factors. Finally we present a method to grow pure wurtzite InAsSb nanowires which are predicted to exhibit even stronger spin-orbit coupling than the zincblende structure.

arXiv comment10 pages and 5 figures

References in corpus (26)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Unpaired Majorana fermions in quantum wires
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Paired states of fermions in two dimensions with breaking of parity and time-reversal symmetries, and the fractional quantum Hall effect
• Helical liquids and Majorana bound states in quantum wires
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Quantum Transport in Semiconductor Nanostructures
• Majorana Zero Modes and Topological Quantum Computation
• Exponential Protection of Zero Modes in Majorana Islands
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Quantized Majorana conductance
• Epitaxy of Semiconductor-Superconductor nanowires
• Scaling of Majorana Zero-Bias Conductance Peaks
• Hard gap in epitaxial semiconductor-superconductor nanowires
• Electron Teleportation via Majorana Bound States in a Mesoscopic Superconductor
• Two-dimensional epitaxial superconductor-semiconductor heterostructures: A platform for topological superconducting networks
• Epitaxy of Advanced Nanowire Quantum Devices
• Parity lifetime of bound states in a proximitized semiconductor nanowire
• Spin-orbit interaction in InSb nanowires
• Topological Phases in InAs${}_{1-x}$Sb${}_x$: From Novel Topological Semimetal to Majorana Wire
• Majorana single-charge transistor
• Spin-orbit coupling and phase-coherence in InAs nanowires
• Magnetotransport properties of individual InAs nanowires
• MBE Growth of Al/InAs and Nb/InAs Superconducting Hybrid Nanowire Structures

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• Selective Area Grown Semiconductor-Superconductor Hybrids: A Basis for Topological Networks
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• Odd-frequency superconducting pairing in one-dimensional systems
• Epitaxial Pb on InAs nanowires
• InSbAs two-dimensional electron gases as a platform for topological superconductivity
• Tunable magnetic textures in spin valves: From spintronics to Majorana bound states
• Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling
• Topological superconductivity in planar Josephson junctions: Narrowing down to the nanowire limit
• Decays of Majorana or Andreev oscillations induced by steplike spin-orbit coupling
• Numerical study of PbTe-Pb hybrid nanowires for engineering Majorana zero modes
• Superconducting proximity effect in InAsSb surface quantum wells with in-situ Al contact
• In Situ Epitaxy of Pure Phase Ultra-Thin InAs-Al Nanowires for Quantum Devices
• Even-odd effect and Majorana states in full-shell nanowires
• Full proximity treatment of topological superconductors in Josephson-junction architectures
• Recent progress on Majorana in semiconductor-superconductor heterostructures--Engineering and detection
• Regaining a spatial dimension: Mechanically transferrable two-dimensional InAs nanofins grown by selective area epitaxy
• Progress in superconductor-semiconductor topological Josephson junctions
• Full electrostatic control of quantum interference in an extended trenched Josephson junction
• Transport signatures of Majorana bound states in superconducting hybrid structures
• Exceptional degeneracies in non-Hermitian Rashba semiconductors
• Enhanced topological protection in planar quasi-one-dimensional channels with periodically-modulated width
• Experimental review on Majorana zero-modes in hybrid nanowires
• Dimerization-induced topological superconductivity in a Rashba nanowire
• Signatures of the Majorana spin in electrical transport through a Majorana nanowire
• Thermal signature of Majorana fermions in Josephson junction
• Majorana bound states in encapsulated bilayer graphene
• Fluxoid-induced pairing suppression and near-zero modes in quantum dots coupled to full-shell nanowires
• Effects of the phase coherence on the local density of states in superconducting proximity structures
• Local density of states in two-dimensional topological superconductors under a magnetic field: signature of an exterior Majorana bound state
• 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
• Majorana Zero Modes in Cylindrical Semiconductor Quantum Wire
• Photon assisted tunneling of high order multiple Andreev reflections in epitaxial nanowire Josephson junctions
• Probing Majorana bound states via a pn-junction containing a quantum dot
• Gate-tunable Superconductivity in Hybrid InSb-Pb Nanowires
• Investigation of InAs based devices for topological applications
• Screening cloud and non-Fermi-liquid scattering in topological Kondo devices
• Exchangeless braiding of Majorana zero modes in weakly coupled Kitaev chains
• A unified numerical approach to semiconductor-superconductor heterostructures
• Majorana bound state parity exchanges in planar Josephson junctions
• Gate-tunable negative differential conductance in hybrid semiconductor-superconductor devices
• Non uniform superconductivity in wires with strong spin-orbit coupling
• Gate-controlled Supercurrent in Ballistic InSb Nanoflag Josephson Junctions
• Electronic transport in double-nanowire superconducting islands with multiple terminals
• Spectroscopic Visualization of Hard Quasi-1D Superconductivity Induced in Nanowires Deposited on a Quasi-2D Indium film