Supercurrent, Multiple Andreev Reflections and Shapiro Steps in InAs Nanosheet Josephson Junctions

Abstract

High-quality free-standing InAs nanosheets are emerging layered semiconductor materials with potentials in designing planar Josephson junction devices for novel physics studies due to their unique properties including strong spin-orbit couplings, large Landé g-factors and the two dimensional nature. Here, we report an experimental study of proximity induced superconductivity in planar Josephson junction devices made from free-standing InAs nanosheets. The nanosheets are grown by molecular beam epitaxy and the Josephson junction devices are fabricated by directly contacting the nanosheets with superconductor Al electrodes. The fabricated devices are explored by low-temperature carrier transport measurements. The measurements show that the devices exhibit a gate-tunable supercurrent, multiple Andreev reflections, and a good quality superconductor-semiconductor interface. The superconducting characteristics of the Josephson junctions are investigated at different magnetic fields and temperatures, and are analyzed based on the Bardeen-Cooper-Schrieffer (BCS) theory. The measurements of ac Josephson effect are also conducted under microwave radiations with different radiation powers and frequencies, and integer Shapiro steps are observed. Our work demonstrates that InAs nanosheet based hybrid devices are desired systems for investigating forefront physics, such as the two-dimensional topological superconductivity.

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Cited by in corpus (7)

• Shapiro steps in driven atomic Josephson junctions
• Microwave-assisted unidirectional superconductivity in Al-InAs nanowire-Al junctions under magnetic fields
• Superconducting Quantum Interference Devices based on InSb nanoflag Josephson junctions
• Tunable superconducting diode effect in higher-harmonic InSb nanosheet interferometers
• Ubiquitous missing first Shapiro step in Al-InSb nanosheet Josephson junctions
• Supercurrent and multiple Andreev reflections in Ge hut nanowire Josephson Junctions
• Supercurrent modulation in InSb nanoflag-based Josephson junctions by scanning gate microscopy