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DTSTART;TZID=Europe/Paris:20260521T150000
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DTSTAMP:20260507T095123Z
CREATED:20260507T095011Z
LAST-MODIFIED:20260507T095123Z
UID:10000149-1779375600-1779379200@sfp-alpes.fr
SUMMARY:Dorian GUINARD (Maître de conférences en droit public à l'Université Grenoble Alpes (Sciences Po Grenoble))
DESCRIPTION:La protection de la biodiversité par le droit\nRésumé : \nLe droit de l’environnement comporte un certain nombre de normes qui théoriquement protègent la biodiversité. L’étude de certains contentieux\, notamment ceux des pesticides et des espèces protégées\, amènent à nuancer ce constat en soulignant les lacunes juridiques\, les enjeux\, et le rôle des juges et de la société civile. \nAttention ! L’accès au site du CNRS est contrôlé. Munissez-vous de votre badge ou contactez Yvonne Soldo (yvonne.soldo@neel.cnrs.fr) suffisamment à l’avance pour accéder au site. \n_ \nContact : julien.delahaye@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/dorian-guinard-maitre-de-conferences-en-droit-public-a-luniversite-grenoble-alpes-sciences-po-grenoble/
LOCATION:CNRS – Bâtiment A\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38054\, France
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260522T110000
DTEND;TZID=Europe/Paris:20260522T120000
DTSTAMP:20260521T143647Z
CREATED:20260521T143647Z
LAST-MODIFIED:20260521T143647Z
UID:10000156-1779447600-1779451200@sfp-alpes.fr
SUMMARY:Vladimir ZAKHAROV (Leiden University)
DESCRIPTION:Luttinger liquid and mass generation on a lattice\nRésumé : \nThe helical edge of a quantum spin Hall insulator hosts a one-dimensional metallic state with spin-momentum locking\, realizing a helical Luttinger liquid (HLL). While the gapless phase is well understood analytically through bosonization in its simplest form\, more complex questions that demand numerical treatment\, have remained largely inaccessible to address for a long time. The core obstacle is the fermion-doubling problem: any local and symmetry-preserving discretization of the Hamiltonian on a strictly one-dimensional lattice either introduces spurious low-energy modes or lifts the Dirac point\, breaking the topological protection of the cone.\nIn this talk I describe how this obstruction can be circumvented using a tangent fermion discretization. This preserves time-reversal symmetry and spin-momentum locking at the lattice level\, without invoking a two-dimensional bulk. I present the application of this method first to the gapless HLL\, where numerical results are in quantitative agreement with bosonization predictions\, establishing the framework as a reliable numerical tool. And then I turn to interaction-induced mass generation\, including spontaneous time-reversal symmetry breaking in HLL and symmetric mass generation in 3-4-5-0 model\, where full analytical treatment is out of reach. \n_ \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/vladimir-zakharov-leiden-university/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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