PhD defense Julian Legendre

Julian Legendre will publicly defend his thesis work on September 15, 2022 at 10:00 a.m. at the CPHT in the Louis Michel conference room

Title: Topological phases, light response and kagome lattice

Advisor: Karyn Le Hur

Jury :

Walter Hofstetter (Président du Jury) Professeur, Goethe Universität Frankfurt (Institut für Theoretische Physik)
Grégoire Misguich (Rapporteur) Chercheur en physique théorique et ingénieur CEA (Institut de Physique Théorique)
Guillaume Roux (Rapporteur) Maître de Conférences, Université Paris-Saclay (Laboratoire de Physique Théorique et Modèles Statistiques)
Pierre Pujol (Examinateur) Professeur, Université Paul Sabatier Toulouse (Laboratoire de Physique Théorique)
Ulrich Schneider (Examinateur) Profeseur, University of Cambridge (Cavendish Laboratory)
Karyn Le Hur (Directrice de thèse) Directrice de Recherche au CNRS et Professeure PCC, École Polytechnique (Centre de Physique Théorique)

Abstract: We theoretically study topological lattice models relevant to current experimental solid- state and artificial systems. We develop an explicit analytical computation of the Chern number in the systems we study and we compare it with other computation methods of this topological invariant. We propose a protocol, based on the local response to a light input, to probe the topological properties of a Haldane boson model in a photonic system. On the kagome lattice, we investigate (i) a magnetic and topological phase transition for a two-channel model, in relation with recently discovered quantum materials, and (ii) a time- reversal topological model with flux, Rashba spin-orbit coupling and Hubbard interactions, relevant for realization in cold-atom gases.

After the reception, we planned a seminar on Condensed matter and Topology