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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20220413T110000
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DTSTAMP:20220407T154800
UID:MEC-d594b1a945b5d645e59e21f88bd2d83b@lps.u-psud.fr
CREATED:20220407
LAST-MODIFIED:20220412
PRIORITY:5
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SUMMARY:Christoph Strunk  | Supercurrent diode effects and φ0-instabilities in syntheticRashba Josephson junctions
DESCRIPTION:\nChristoph Strunk (Université de Regensburg-Allemagne) \n\n\n\nWe study Josephson junctions in epitaxial Al/InGaAs/InAs heterostructures. Usingreflectometry, we measure the Josephson inductance as well as DC transport properties.We find that our junctions are in the ballistic limit, featuring a current phase relationwith near-unity transmission [1]. When applying in-plane magnetic field perpendicular tothe current, the Josephson inductance reveals the presence of non-reciprocal supercurrentfar below the superconducting transition temperature that results from magnetochiralanisotropy. Also the transport critical current Ic displays a pronounced superconductingdiode effect [2]. As the result of a small Dresselhaus component, the orientation of thecurrent with respect to the lattice affects the magnetochiral anisotropy [3]. At highermagnetic field the coefficient of magneto-chiral anisotropy changes sign. This can beunderstood as an instability of the spontaneous φ0-shift, resulting from competing groundstates in the Josephson coupling energy.\n\n\n\n\n\n\n\n[1] C. Baumgartner et al., Phys. Rev. Lett. 126, 037001 (2021).[2] C. Baumgartner et al., Nature Nanotechnology 17, 39 (2022).[3] C. Baumgartner et al., J. Phys. Condens. Matter 34, 154005 (2022).\n
URL:https://www.lps.u-psud.fr/events/christoph-strunk-supercurrent-diode-effects/
ORGANIZER;CN=Marco APRILI:MAILTO:
CATEGORIES:Séminaire Matière Quantique (SMQ),Séminaires
LOCATION:Bât 510, Orsay (91)
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