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DTSTART;TZID=Europe/Paris:20220413T110000
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DTSTAMP:20220407T150900
UID:MEC-643de7cf7ba769c7466ccbc4adfd7fac@lps.u-psud.fr
CREATED:20220407
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SUMMARY:Christoph Strunk | Supercurrent diode effects and  ‘0-instabilities in synthetic Rashba Josephson junctions
DESCRIPTION:\nChristoph Strunk, Institute of Experimental and Applied Physics, University of Regensburg, Germany\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 nd that our junctions are in the ballistic limit, featuring a current phase relationwith near-unity transmission [1]. When applying in-plane magnetic eld 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 eect [2]. As the result of a small Dresselhaus component, the orientation of thecurrent with respect to the lattice aects the magnetochiral anisotropy [3]. At highermagnetic eld the coecient of magneto-chiral anisotropy changes sign. This can beunderstood as an instability of the spontaneous ‘0-shift, resulting from competing groundstates in the Josephson coupling energy.\n\n\n\n\n\n\n\nIESC Cargèse, centre de conférences\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/en/events/christoph-strunksupercurrent-diode-eects-and-0-instabilities-in-synthetic-rashba-josephson-junctions/
CATEGORIES:Seminar SMQ
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