Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet—Andreev states

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2023
Autor:innen
Haxell, Daniel Z.
Coraiola, Marco
Sabonis, Deividas
Hinderling, Manuel
ten Kate, Sofieke C.
Cheah, Erik
Krizek, Filip
Schott, Rüdiger
Wegscheider, Werner
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Nature Communications. Springer. 2023, 14, 6798. eISSN 2041-1723. Available under: doi: 10.1038/s41467-023-42357-5
Zusammenfassung

Light–matter coupling allows control and engineering of complex quantum states. Here we investigate a hybrid superconducting–semiconducting Josephson junction subject to microwave irradiation by means of tunnelling spectroscopy of the Andreev bound state spectrum and measurements of the current–phase relation. For increasing microwave power, discrete levels in the tunnelling conductance develop into a series of equally spaced replicas, while the current–phase relation changes amplitude and skewness, and develops dips. Quantitative analysis of our results indicates that conductance replicas originate from photon assisted tunnelling of quasiparticles into Andreev bound states through the tunnelling barrier. Despite strong qualitative similarities with proposed signatures of Floquet–Andreev states, our study rules out this scenario. The distortion of the current–phase relation is explained by the interaction of Andreev bound states with microwave photons, including a non-equilibrium Andreev bound state occupation. The techniques outlined here establish a baseline to study light–matter coupling in hybrid nanostructures and distinguish photon assisted tunnelling from Floquet–Andreev states in mesoscopic devices.

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530 Physik
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Electronic properties and materials, Superconducting properties and materials
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ISO 690HAXELL, Daniel Z., Marco CORAIOLA, Deividas SABONIS, Manuel HINDERLING, Sofieke C. TEN KATE, Erik CHEAH, Filip KRIZEK, Rüdiger SCHOTT, Werner WEGSCHEIDER, Wolfgang BELZIG, Juan Carlos CUEVAS, Fabrizio NICHELE, 2023. Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet—Andreev states. In: Nature Communications. Springer. 2023, 14, 6798. eISSN 2041-1723. Available under: doi: 10.1038/s41467-023-42357-5
BibTex
@article{Haxell2023-10-26Micro-68046,
  year={2023},
  doi={10.1038/s41467-023-42357-5},
  title={Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet—Andreev states},
  volume={14},
  journal={Nature Communications},
  author={Haxell, Daniel Z. and Coraiola, Marco and Sabonis, Deividas and Hinderling, Manuel and ten Kate, Sofieke C. and Cheah, Erik and Krizek, Filip and Schott, Rüdiger and Wegscheider, Werner and Belzig, Wolfgang and Cuevas, Juan Carlos and Nichele, Fabrizio},
  note={Article Number: 6798}
}
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