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DTSTART;TZID=Europe/Paris:20260612T110000
DTEND;TZID=Europe/Paris:20260612T120000
DTSTAMP:20260604T132045Z
CREATED:20260604T132045Z
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UID:10000183-1781262000-1781265600@sfp-alpes.fr
SUMMARY:Benjamin LENZ (IMPMC)
DESCRIPTION:Spectroscopic signatures of spin-polarons in quasi two-dimensional correlated materials\nRésumé : \nThe motion of a single hole in a two-dimensional antiferromagnet can lead to the formation of a low-energy quasiparticle\, a so-called spin-polaron\, which amounts to a bound state of the doped hole and a spin flip. In this talk\, I will first introduce the notion of spin-polarons and then discuss spectroscopic signatures of this quasiparticle at the example of two different material classes which both host quasi two-dimensional low-energy physics in their correlated electronic structure.\nIllustrated by the Na-doped oxychloride Ca2CuO2Cl2\, we will see how the spin-polaron gives rise to “kink” and “waterfall” features in the spectral function of hole-doped cuprates. Employing a numerical workflow comprising density functional theory and cluster dynamical mean-field theory\, we will discuss these features in comparison to measurements obtained from angle-resolved photoemission spectroscopy. As a second example\, we will see that spin-polaron physics is also relevant in two prototypical iridates\, (Ba\,Sr)2IrO4\, which host an exotic spin-orbital entangled jeff=1/2 ground state. In particular\, the characteristic two-peak structure of their optical absorption and optical conductivity curves will be revisited and interpreted in the light of these coherent low-energy quasiparticles. \nB. Bacq-Labreuil et al.\, Phys. Rev. Lett. 134\, 016502 (2025)\nF. Cassol et al.\, arXiv:2509.20337; accepted in Phys. Rev. B (2026) \n_ \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/benjamin-lenz-impmc/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260612T110000
DTEND;TZID=Europe/Paris:20260612T120000
DTSTAMP:20260604T142423Z
CREATED:20260604T142423Z
LAST-MODIFIED:20260604T142423Z
UID:10000187-1781262000-1781265600@sfp-alpes.fr
SUMMARY:Alexandra COLIN (CEA-Irig/LPCV)
DESCRIPTION:Dynamics and Scaling of Competitive Actin Architectures\nRésumé : \n\nCells constantly experience environmental changes requiring a fast adaptation of their different actin structures. However\, the mechanisms governing the size and dynamics of these multiple actin structures remain unknown. Decoupling the various parameters that would provide a complete understanding of these mechanisms is very complicated in a cellular context. This is why we have developed a bottom-up approach to identify the key molecular mechanisms that determine the size and coexistence of multiple competing actin architectures. We used a reconstituted system consisting of purified proteins and substrates to localize actin polymerization in microwells\, enabling us to work with a limited number of components. With this system\, we reconstituted several dynamic actin architectures\, competing for a limited pool of protein\, over a period of multiple hours. This allowed us to gain key insights into physiological functions related to actin turnover. I will show how we used this system to study the limits of scaling in dynamic structures\, as well as the limits of coexistence in actin networks under resource-limited conditions. Finally\, I will show how we can recapitulate these results in a complementary cellular system\, in which we have demonstrated that an increase in spreading area leads to a decrease in overall turnover\, due to a predominance of structures with low turnover.​​​​​\n​\n\n\n\nLes séminaires et soutenances sont ouverts à tous\, notez toutefois que l’accès au campus EPN nécessite un avis de rendez-vous. Merci de remplir ce formulaire  et de l’adresser\, plus de 48h à l’avance\, à ce contact.\nPensez à vous munir d’une pièce d’identité le jour de votre visite.
URL:https://sfp-alpes.fr/event/alexandra-colin-cea-irig-lpcv/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
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