Physique De La Matière Condensée

Antoine GeorgesPhysique de la matière condenséeAnnée 2022-2023Conférence - Assa Auerbach : Correlations and Transport in Strongly Interacting Phases of Condensed MatterAssa Auerbach, Department of Physics, Technion, Israel Institute of TechnologyThe Higgs Mode and Quantum Criticality in Condensed MatterThe two dimensional O(N) relativistic field theory applied to bosonic condensed matter systems, predicts a massive amplitude mode which is paradigm of the high energy Higgs particle in electroweak theory. The condensed matter Higgs mode is a critical mode, which softens tuned toward a quantum critical transition. We have shown by that it is still visible as a threshold of optical conductivity, and in scalar dynamical susceptibilities, even when coupled to lower energy Goldstone modes.I review experimental detection of critical Higgs modes in cold atoms on an optical lattice, at the superconducting to insulator transition in granular films, and as a "non-classical" optical mode in solid helium.