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DTSTART;TZID=Europe/Paris:20260924T140000
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DTSTAMP:20260827T153130Z
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UID:10000225-1790258400-1790262000@sfp-alpes.fr
SUMMARY:Alexandre BERNARD (Walter Schottky Institute\, TU Munich)
DESCRIPTION:Remanent anomalous Hall effect from dual spin-orbit and exchange proximity in graphene heterostructure\nRésumé : \nThe coexistence of induced spin-orbit coupling (SOC) and magnetic exchange fields is predicted to drive graphene into topological phases\, such as the quantum anomalous Hall state. In this talk\, I will discuss the prospect of using monolayer graphene proximitized by WSe2 (SOC) and Cr2Ge2Te6 (magnetic exchange) to reach such “ex-so-tic” states. Low-temperature magnetotransport measurements of the heterostructures reveal a large and gate-tunable remanent anomalous Hall effect (AHE) persisting at zero magnetic field. Combining data analysis over various magnetic field ranges and a simple model\, we explain our findings by an intrinsic AHE regime\, where Berry curvature hot-spots from the interplay of SOC and magnetism dominate the Hall response\, but disorder broadening prevents quantization and a full topological phase transition. These results demonstrate the potential of double proximity effects in graphene-based van der Waals heterostructures as a route toward gate-tunable topological graphene phases and devices based on chiral edge states. \n_ \nContact : florence.levy-bertrand@neel.cnrs.fr \n 
URL:https://sfp-alpes.fr/event/alexandre-bernard-walter-schottky-institute-tu-munich/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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