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

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2022
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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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Light-matter interaction enables engineering of non-equilibrium quantum systems. In condensed matter, spatially and temporally cyclic Hamiltonians are expected to generate energy-periodic Floquet states, with properties inaccessible at thermal equilibrium. A recent work explored the tunnelling conductance of a planar Josephson junction under microwave irradiation, and interpreted replicas of conductance features as evidence of steady Floquet-Andreev states. Here we realise a similar device in a hybrid superconducting-semiconducting heterostructure, which utilises a tunnelling probe with gate-tunable transparency and allows simultaneous measurements of Andreev spectrum and current-phase relation of the planar Josephson junction. We show that, in our devices, spectral replicas in sub-gap conductance emerging under microwave irradiation are caused by photon assisted tunnelling of electrons into Andreev states. The current-phase relation under microwave irradiation is also explained by the interaction of Andreev states with microwave photons, without the need to invoke Floquet states. For engineering and control of non-equilibrium states of matter, it is of paramount importance to recognise the intricacies of mesoscopic systems. This study harnesses the advantages of gate-tunable devices to build an understanding of light-matter coupling in hybrid nanostructures.

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530 Physik
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Josephson junctions, microwave irradiation, Andreev spectrum, hybrid nanostructures
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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, 2022. Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet-Andreev states
BibTex
@unpublished{Haxell2022-12-07T10:09:29ZMicro-59524,
  year={2022},
  title={Microwave-induced conductance replicas in hybrid Josephson junctions without Floquet-Andreev states},
  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}
}
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