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DTSTART;TZID=Europe/Paris:20261020T090000
DTEND;TZID=Europe/Paris:20261020T120000
DTSTAMP:20261009T141656Z
CREATED:20261003T082005Z
LAST-MODIFIED:20261009T141656Z
UID:12419-1792486800-1792497600@fermi.univ-tlse3.fr
SUMMARY:Ab initio modeling of electronic and magnetic properties of small Wigner crystals.- (Daniele Lagasco  LPT / These). -20/10/2026\, 2 p.m.
DESCRIPTION:PhD defense \nDaniele Lagasco LPT\, Salle de conférence\, Bat. 3R4 – 2 p.m. \nAbstract:\nWigner crystallization\, proposed in 1934\, predicts that in an electronic liquid at sufficiently low density — where the Coulomb potential dominates over the kinetic energy — the electrons arrange themselves into an ordered structure. This work is motivated by a recent observation of few-electron Wigner crystals in a quasi-one-dimensional system. The objective of the thesis is to calculate the charge distribution and the magnetic exchange coupling of N electrons in a one-dimensional system using ab initio methods. In the first method\, we obtain an analytical expression for the exchange coupling of a two-electron Wigner dimer confined to a one-dimensional space in the low-density limit\, using two complementary approaches. The first consists of the analytical solution of the Schrödinger equation for two electrons\, assuming the center of mass of the two particles to be fixed. Under this approximation\, the original problem reduces to a second-order differential equation\, which is solved in terms of Whittaker functions. The second approach is based on the quasiclassical\, or Wentzel-Kramers-Brillouin (WKB)\, approximation. The two approaches yield compatible results in their overlapping region of validity. In the second method\, we model the N-electron liquid in order to reproduce the experimental setup we aim to interpret. We adopt a full configuration interaction approach to capture electron correlation. With this approach\, we obtain accurate electronic density profiles of small one-dimensional Wigner crystals with N = 2 to N = 4 electrons\, which clearly show the localization of the electrons. Finally\, we present a simple approach for obtaining the exchange coupling constant by mapping our ab initio results onto a Heisenberg Hamiltonian. \n\n \n \n 
URL:https://fermi.univ-tlse3.fr/event/modelisation-de-petits-cristaux-de-wigner-daniele-lagasco-lpt-these-20-10-2026/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,HDR / Thesis,LPT
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DTSTART;TZID=Europe/Paris:20261022T110000
DTEND;TZID=Europe/Paris:20261022T120000
DTSTAMP:20261013T081614Z
CREATED:20261002T081535Z
LAST-MODIFIED:20261013T081614Z
UID:12500-1792666800-1792670400@fermi.univ-tlse3.fr
SUMMARY:Le rubidium dans tous ses états: Des accéléromètres à atomes froids aux fluides de lumière dans les vapeurs chaude. - (Noemi Marquet / Seminar / LCAR). - 22/10/2026\, 11H
DESCRIPTION:Séminaire LCAR \nNoemi Marquet\, Laboratoire Kastler Brossel\, Sorbonne Université\, Paris
URL:https://fermi.univ-tlse3.fr/event/le-rubidium-dans-tous-ses-etats-des-accelerometres-a-atomes-froids-aux-fluides-de-lumiere-dans-les-vapeurs-chaude-noemi-marquet-seminar-lcar-22-10-2026-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261026T090000
DTEND;TZID=Europe/Paris:20261030T170000
DTSTAMP:20261009T141703Z
CREATED:20261002T121518Z
LAST-MODIFIED:20261009T141703Z
UID:12423-1793005200-1793379600@fermi.univ-tlse3.fr
SUMMARY:Journées de la Matière Condensée 2026 (JMC) du 26 au 30 octobre 2026 (Toulouse)
DESCRIPTION:Journées de la Matière Condensée \nPrésentation : \nles Journées de la Matière Condensée (JMC) sont organisées toutes les années paires par la Division de Physique de la Matière Condensée de la Société Française de Physique (SFP).\nLes thématiques abordées couvrent l’ensemble des domaines relevant de la matière condensée\, des concepts aux applications. Le succès de ces journées en fait le plus grand congrès national de physique de la Matière Condensée en France (500-700 participants). \nRetrouvez tous les détails ici
URL:https://fermi.univ-tlse3.fr/event/journees-de-la-matiere-condensee-2026-jmc-du-26-au-30-octobre-2026-toulouse/
LOCATION:Auditorium Marthe Condat\, 118 route de narbonne\, Toulouse\, 31062\, France
CATEGORIES:Events,SFP / SFC,Symposium / Congress
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