Supercurrent through a spin-split quasi-ballistic point contact in an InAs nanowire

Abstract

We study the superconducting proximity effect in an InAs nanowire contacted by Ta-based superconducting electrodes. Using local bottom gates, we control the potential landscape along the nanowire, tuning its conductance to a quasi-ballistic regime. At high magnetic field ($B$), we observe approximately quantized conductance plateaus associated with the first two spin-polarized one-dimensional modes. For $B<1$ T, the onset of superconductivity occurs in concomitance with the development of sizeable charge localization leading to a 0.7-type conductance anomaly. In this regime, the proximity supercurrent exhibits an unusual, non-monotonic $B$ dependence. We interpret this finding in terms of a competition between the Kondo effect, dominating near $B=0$, and the Zeeman effect, enforcing spin polarization and the emergence of a $\pi$ phase shift in the Josephson relation at higher $B$.

References in corpus (27)

• The numerical renormalization group method for quantum impurity systems
• Realizing Majorana zero modes in superconductor-semiconductor heterostructures
• Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures
• Supercurrent reversal in quantum dots
• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Kondo model for the "0.7 anomaly" in transport through a quantum point contact
• Ballistic superconductivity in semiconductor nanowires
• Self-consistent description of Andreev bound states in Josephson quantum dot devices
• Experimental Phase Diagram of a One-Dimensional Topological Superconductor
• Critical Current 0-$\pi$ Transition in Designed Josephson Quantum Dot Junctions
• Correlating the nanostructure and electronic properties of InAs nanowires
• Tuning the Josephson current in carbon nanotubes with the Kondo effect
• Majorana splitting from critical currents in Josephson junctions
• Conductance Quantization at zero magnetic field in InSb nanowires
• Multiple Andreev reflection and critical current in topological superconducting nanowire junctions
• Scaling of sub-gap excitations in a superconductor-semiconductor nanowire quantum dot
• Electrical tuning of Rashba spin-orbit interaction in multigated InAs nanowires
• Supercurrent interference in few-mode nanowire Josephson junctions
• Supercurrent in a double quantum dot
• 0-$\pi$ quantum transition in a carbon nanotube Josephson junction: universal phase dependence and orbital degeneracy
• Magnetically-driven colossal supercurrent enhancement in InAs nanowire Josephson junctions
• Mapping the Topological Phase Diagram of Multiband Semiconductors with Supercurrents
• Josephson Current through a Semiconductor Nanowire: effect of strong spin-orbit coupling and Zeeman splitting
• Split-Channel Ballistic Transport in an InSb Nanowire
• 0-Pi quantum transition in a carbon nanotube Josephson junction: Universal phase dependence and orbital degeneracy
• Nb/InAs nanowire proximity junctions from Josephson to quantum dot regimes
• First order $0/\pi$ quantum phase transition in the Kondo regime of a superconducting carbon nanotube quantum dot

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• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
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• A perspective on semiconductor-based superconducting qubits
• Quantum-Dot Parity Effects in Trivial and Topological Josephson Junctions
• Two-Impurity Yu-Shiba-Rusinov States in Coupled Quantum Dots
• Multiple Andreev reflections and Shapiro steps in a Ge-Si nanowire Josephson junction
• Zeeman-driven parity transitions in an Andreev quantum dot
• Josephson junctions in double nanowires bridged by in-situ deposited superconductors
• On-off switch and sign change for non-local Josephson diode in spin-valve Andreev molecules
• InAs on Insulator: A New Platform for Cryogenic Hybrid Superconducting Electronics
• Gate-tunable subband degeneracy in semiconductor nanowires
• Anisotropic Kondo screening induced by spin-orbit coupling in quantum wires
• Richardson model with complex level structure and spin-orbit coupling for hybrid superconducting islands: stepwise suppression of pairing and magnetic pinning
• Collapse of the Josephson emission in a carbon nanotube junction in the Kondo regime
• Radio-frequency characterization of a supercurrent transistor made from a carbon nanotube