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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20260326T110000
DTEND;TZID=Europe/Paris:20260326T180000
DTSTAMP:20260310T094200
UID:MEC-c600b4b49faa3a2a165242e90ca21ac3@lps.u-psud.fr
CREATED:20260310
LAST-MODIFIED:20260310
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Maksym Serbyn : Probing superconductivity and emergent excitations with microwaves
DESCRIPTION:\nMicrowave spectroscopy provides a sensitive probe of superconducting systems by direct measurement of kinetic inductance (and therefore the superfluid density) and by efficient coupling to low-energy collective modes.I will overview recent experimental examples where microwaves provide insight into superconductivity and emergent excitations, and discuss the theoretical understanding and open questions motivated by these experiments. First, motivated by experiments [1], I will discuss how heterostructures proximitized by superconductors can be probed via measurements of their superfluid density in microwave resonators. I will summarize our theoretical results [2,3] showing how the magnetic-field dependence of the superfluid density reveals the role of spin–orbit coupling, disorder, and the emergence of gapless superconductivity.In the second part, I will show how microwave spectroscopy is used experimentally to probe plasmon modes in Josephson junction chains [4]. Motivated by these experiments, I will present our current theoretical understanding [5] of the intrinsic linewidth of plasmons arising from their nonlinear interactions, and outline open theoretical questions about nonequilibrium regimes.\n\n\n\n1.    D. Phan et al., “Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit”,arXiv:2107.03695 , PRL 128, 107701 (2021).\n\n\n\n2.    S.S. Babkin et al., “Proximity-induced gapless superconductivity in 2d Rashba semiconductor in magnetic field“,arXiv:2311.09347 , SciPost Phys. 16, 115 (2024).\n\n\n\n3.    S.S. Babkin et al., “Superconducting Proximity Effect in Two-Dimensional Hole Gases”,arXiv:2412.04084 , PRB 111, 214518 (2025).\n\n\n\n4.    A.V. Bubis et al., “Nonequilibrium plasmon liquid in a Josephson junction chain”,arXiv:2504.09721 , Sci. Adv. 12, eady7222 (2026).\n\n\n\n5.    L. Vigliotti et al., “Intrinsic decay rates and steady states of driven Josephson junction chains cavities”,arXiv:2603.06371 (2026).\n
URL:https://www.lps.u-psud.fr/events/maksym-serbyn-probing-superconductivity-and-emergent-excitations-with-microwaves/
ORGANIZER;CN=Andrej Meszaros:MAILTO:
CATEGORIES:Séminaire de la Théorie de la Matière Condensée,Séminaires
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
ATTACH;FMTTYPE=:https://www.lps.u-psud.fr/wp-content/uploads/2026/03/Maksym-Serbyn.webp
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