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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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BEGIN:VEVENT
CLASS:PUBLIC
DTSTART;TZID=Europe/Paris:20231123T110000
DTEND;TZID=Europe/Paris:20231123T120000
DTSTAMP:20231119T213800
UID:MEC-7e6ff0205749bc6025b51155e26f6ced@lps.u-psud.fr
CREATED:20231119
LAST-MODIFIED:20231119
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:D.MEIDAN:Josephson junctions of topological nodal superconductors
DESCRIPTION:\nTransition metal dichalcogenides (TMDs) offer a unique platform to study unconventional superconductivity, owing to the presence of strong spin-orbit coupling and a remarkable stability to an in-plane magnetic field. A recent study found that when an in-plane field applied to a superconducting monolayer TMD is increased beyond the Pauli critical limit, a quantum phase transition occurs into a topological nodal superconducting phase which hosts Majorana flat bands.\n\nWe study the current-phase relation of this nodal superconductor in a Josephson junction geometry. We find that the nodal superconductivity is associated with an energy-phase relation that depends on the momentum transverse to the current direction, with a 4 periodicity in between pairs of nodal points. We interpret this response as a result of a series of quantum phase transitions, driven by the transverse momentum, which separate a topological trivial phase and two distinct topologically non-trivial phases characterized by different winding invariants. This analysis sheds light on the stability of the Majorana flat bands to symmetry-breaking perturbations.\n\n
URL:https://www.lps.u-psud.fr/events/templ-20042023-548/
ORGANIZER;CN=Andrej Mesaros:MAILTO:andrej.mesaros@universite-paris-saclay.fr
CATEGORIES:Séminaire de la Théorie de la Matière Condensée
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
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