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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:20260408T110000
DTEND;TZID=Europe/Paris:20260408T180000
DTSTAMP:20260401T124800
UID:MEC-f2f446980d8e971ef3da97af089481c3@lps.u-psud.fr
CREATED:20260401
LAST-MODIFIED:20260401
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Christoph Strunk : Anomalous Josephson effects as a probe of spin textures in InAs and HgTe weak links
DESCRIPTION:\nThe interplay between Rashba spin-orbit interaction and Zeeman fields gives rise to the anomalous Josephson effect: An anomalous phase-shift φ0 in the junctions current-phase relation. We measure the φ0-shift via a kinked junction geometry realized in a weak link realized in an epitaxial Al/InAs heterostructure. An intentional variation of φ0 along the weak link is introduced by its angle with respect to an in-plane magnetic field. This results in a unique quantum interference pattern, from which the corresponding φ0-shift is extracted with the help of a minimal theoretical model. When the rotating the magnetic field in plane, the φ0-shift and the supercurrent diode effect alternate in magnitude.\n\n\n\nIn a second experiment we measure the current-phase relation of a Josephson junction in a HgTe 3D topological insulator weak link. The Josephson current through the topological surface states is dominant, and gives rise to a strongly anharmonic current phase relation. In the presence of an in-plane magnetic field, we measure a giant φ0-shift that is about 50 times larger than in InAs. The magnitude of the effect is attributed to the presence of only a single Fermi contour in the topological surface states. Rotating the magnetic field in the plane reveals a nearly isotropic spin texture with maximum φ0-shift at 109° with respect to the current direction. In addition to a Rashba term, this suggests the contribution of a Weyl-like contribution to the spin-orbit coupling, which favours a parallel alignment of spin and momentum and is consistent with the (013)-orientation of the HgTe surface.\n
URL:https://www.lps.u-psud.fr/en/events/christoph-strunk-anomalous-josephson-effects-as-a-probe-of-spin-textures-in-inas-and-hgte-weak-links/
CATEGORIES:Seminar SMQ,Seminars
ATTACH;FMTTYPE=image/jpeg:https://www.lps.u-psud.fr/wp-content/uploads/2026/04/strunk-300x300-1.jpg
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