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DTSTART;TZID=Europe/Paris:20260217T140000
DTEND;TZID=Europe/Paris:20260217T150000
DTSTAMP:20260130T142159Z
CREATED:20260129T161723Z
LAST-MODIFIED:20260130T142159Z
UID:10000039-1771336800-1771340400@sfp-alpes.fr
SUMMARY:Igor ROZHANSKIY (National Graphene Institute\, University of Manchester)
DESCRIPTION:Interacting spin physics in 2D : flat bands\, SOC renormalization\, and chiral textures\nRésumé : \nTwo-dimensional materials and their heterostructures offer a controllable setting where exchange\, spin-orbit coupling (SOC)\, and electron interactions shape the spin-resolved electronic structure and response. This seminar links two recent directions of my work through this common theme.\nThe first part focuses on van der Waals magnets (chromium trihalides) combined with graphene. Narrow\, spin-polarized conduction bands make these systems susceptible to charge-transfer-driven doping and strong correlations. Using DFT-calibrated effective tight-binding models\, I will show how flat-band features and longer-range hopping processes determine the low-energy spectrum and favor regimes with heavy\, strongly interacting carriers.\n​ The second part addresses many-body renormalization of SOC in monolayer transition metal dichalcogenides. Exchange effects can enhance the conduction-band spin-orbit splitting in a density-dependent manner. I will outline ​the underlying mechanism and discuss how it can be inferred from gated transport and quantum-oscillation measurements\, including multilayer configurations where valley structure and interlayer coupling provide additional diagnostics.\nA short outlook will touch on chiral spin textures\, such as skyrmions\, and how real-space chirality can contribute to transverse signals\, emphasizing possible connections and open questions for 2D material platforms. \nhttps://www.cea.fr/drf/irig/Pages/Animation-scientifique/seminaires/2026_Rozhanskiy.aspx \nContact : admin.spintec@cea.fr
URL:https://sfp-alpes.fr/event/igor-rozhanskiy-national-graphene-institute-university-of-manchester/
LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, 17\, avenue des Martyrs\, Grenoble\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IRIG - CEA":MAILTO:irig.communication@cea.fr
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DTSTART;TZID=Europe/Paris:20260217T140000
DTEND;TZID=Europe/Paris:20260217T150000
DTSTAMP:20260205T161544Z
CREATED:20260205T161137Z
LAST-MODIFIED:20260205T161544Z
UID:10000053-1771336800-1771340400@sfp-alpes.fr
SUMMARY:Anton POTOCNIK (IMEC\, Belgium)
DESCRIPTION:High-coherence foundry-compatible superconducting qubit platform\nRésumé : \nThe field of superconducting qubit technology has experienced rapid development over the past two decades. Recent advancements in the fabrication\, control and measurement of superconducting quantum devices have enabled integration of hundreds of qubits on a single chip. However\, the path towards larger-scale integration of thousands of qubits on a chip remains unclear. This talk presents imec’s platform for scalable superconducting qubit fabrication\, which is based on foundry-compatible thin film processing 1 and overlay Josephson-junction fabrication 2. The platform enables all-optical superconducting transmon qubit fabrication on 300 mm wafers\, achieving near state-of-the-art coherence times\, record-low aging and comparable Josephson junction variability to standard shadow-evaporation technique 3. A key focus of this presentation will be the understanding and mitigation of microwave losses induced by various fabricaiton steps such as Ar-milling 4 and oxide removal 6\,7 and materials such as -Ta 5 or ultra-high-resistivity silicon. The talk will conclude with an outline of ongoing efforts toward large-scale qubit characterization and control using cryo-CMOS electronics operating near qubits at the mixing-chamber plate of a dilution refrigerator 8. \n1 Mongillo\, et al.\, IEDM (2022). \n2 Verjauw et al.\, npj Quantum Information 8\, 93 (2022). \n3 Van Damme\, et al.\, Nature\, 634\, 74 (2024). \n4 Van Damme\, et al.\, PRA 20\, 014034 (2023). \n5 Lozano\, et al. Mater. Quantum. Technol. 4\, 025801 (2024). \n6 Verjauw\, et al.\, PRA 16\, 014018 (2021). \n7 Lozano\, et al.\, Advanced Science 12\, e09244 (2025). \n8 Acharya\, et al.\, Nature Electronics\, 6\, 900 (2023). \n_ \nContact : equipe-seminaires-nano@listes.grenoble.cnrs.fr
URL:https://sfp-alpes.fr/event/anton-potocnik-imec-belgium/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260217T140000
DTEND;TZID=Europe/Paris:20260217T150000
DTSTAMP:20260206T091214Z
CREATED:20260206T091214Z
LAST-MODIFIED:20260206T091214Z
UID:10000054-1771336800-1771340400@sfp-alpes.fr
SUMMARY:Francesco ROSA (Politecnico di Milano\, Italy)
DESCRIPTION:Magnetic and orbital properties of infinite-layer nickelate and cuprate superconductors\nRésumé : \nInfinite-layer (IL) nickelates recently gained strong interest thanks to their apparent analogies with cuprates\, including a square lattice-based structure dominated by superexchange antiferromagnetic interaction and the emergence of superconductivity upon hole doping. X-ray spectroscopies with synchrotron light are a very powerful tool for the investigation of such systems\, providing complementary information to the more traditional inelastic neutron scattering. In this seminar\, we discuss some of the recent results obtained by our group using both Resonant Inelastic X-ray Scattering (RIXS) and X-ray Magnetic Circular Dichroism (XMCD)\, mainly focusing on magnetism. RIXS results concern the analysis of dynamic spin excitations (magnons/paramagnons)\, investigating the effect of hole-doping on them and providing an estimate for the magnetic exchange coupling constants. Results on IL nickelates will be compared to analogous ones on cuprates\, highlighting analogies and differences. XMCD analysis is devoted to the static spin order in IL nickelates\, reporting the presence of a field induced out-of-plane Ni1+ spin moment. Based on magnetic field- and temperature-dependent measurements\, we justify our observations with an out-of-plane canting of in-plane anti-ferromagnetically correlated Ni1+ spins\, tentatively attributed to a symmetry lowering of the NiO2 planes. \n_ \nContact : andrew.fefferman@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/francesco-rosa-politecnico-di-milano-italy/
LOCATION:CNRS – Salle Louis Weil (E424)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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