Spin-orbit interaction and induced superconductivity in an one-dimensional hole gas

Abstract

Low dimensional semiconducting structures with strong spin-orbit interaction (SOI) and induced superconductivity attracted much interest in the search for topological superconductors. Both the strong SOI and hard superconducting gap are directly related to the topological protection of the predicted Majorana bound states. Here we explore the one-dimensional hole gas in germanium silicon (Ge-Si) core-shell nanowires (NWs) as a new material candidate for creating a topological superconductor. Fitting multiple Andreev reflection measurements shows that the NW has two transport channels only, underlining its one-dimensionality. Furthermore, we find anisotropy of the Lande g-factor, that, combined with band structure calculations, provides us qualitative evidence for direct Rashba SOI and a strong orbital effect of the magnetic field. Finally, a hard superconducting gap is found in the tunneling regime, and the open regime, where we use the Kondo peak as a new tool to gauge the quality of the superconducting gap.

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Cited by in corpus (19)

• The germanium quantum information route
• Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise
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• Self-controlled growth of highly uniform Ge/Si hut wires for scalable qubit devices
• Multiple Andreev reflections and Shapiro steps in a Ge-Si nanowire Josephson junction
• Hard superconducting gap and diffusion-induced superconductors in Ge-Si nanowires
• Supercurrent carried by non-equlibrium quasiparticles in a multiterminal Josephson junction
• Charge-noise induced dephasing in silicon hole-spin qubits
• Majorana zero modes in gate-defined germanium hole nanowires
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
• Analytic approach to transport in superconducting junctions with arbitrary carrier density
• Anisotropic $g$-tensors in hole quantum dots: The role of the transverse confinement direction
• Germanium-based hybrid semiconductor-superconductor topological quantum computing platforms: Disorder effects
• InP/GaSb core-shell nanowires: a novel hole-based platform with strong spin-orbit coupling for full-shell hybrid devices
• Low-symmetry nanowire cross-sections for enhanced Dresselhaus spin-orbit interaction
• Phase transformation-induced superconducting aluminium-silicon alloy rings
• Hole subband dispersions in a cylindrical Ge nanowire: exact results based on the axial Luttinger-Kohn Hamiltonian
• Hole subband dispersions and strong `spin'-orbit coupling in a cylindrical Ge nanowire
• Impact of spin-orbit coupling and Zeeman interaction on the multiple Andreev reflections subharmonic gap structure in nanoscopic Josephson junctions