Equal-Spin Andreev Reflection in Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor

Abstract

The recent development of superconducting spintronics has revealed the spin-triplet superconducting proximity effect from a spin-singlet superconductor into a spin-polarized normal metal. In addition recently superconducting junctions using semiconductors are in demand for highly controlled experiments to engineer topological superconductivity. Here we report experimental observation of Andreev reflection in junctions of spin-resolved quantum Hall (QH) states in an InAs quantum well and the spin-singlet superconductor NbTi. The measured conductance indicates a sub-gap feature and two peaks on the outer side of the sub-gap feature in the QH plateau-transition regime increases. The observed structures can be explained by considering transport with Andreev reflection from two channels, one originating from equal-spin Andreev reflection intermediated by spin-flip processes and second arising from normal Andreev reflection. This result indicates the possibility to induce the superconducting proximity gap in the the QH bulk state, and the possibility for the development of superconducting spintronics in semiconductor devices.

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Cited by in corpus (11)

• Interference of chiral Andreev edge states
• Loss and decoherence at the quantum Hall - superconductor interface
• Andreev reflection at the interface with an oxide in the quantum Hall regime
• Numerical investigation of gapped edge states in fractional quantum Hall-superconductor heterostructures
• Edge-induced pairing states in a Josephson junction through a spin-polarized quantum anomalous Hall insulator
• Quantum Hall Bogoliubov Interferometer
• Non-local transport measurements in hybrid quantum Hall - superconducting devices
• Transparent Graphene-Superconductor Interfaces: Quantum Hall and Zero Field Regimes
• Edge optical effect as a probe of chiral topological superconductors
• Revealing Superconducting Chiral Edge Modes via Resistance Distributions
• Quantized Transport of $\nu =2/3$ Fractional Quantum Hall Edge with Disordered Superconducting Proximity