Physique de la matière condensée - Antoine Georges

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Réseaux de neurones, apprentissage et physique quantique

Séminaire : Juan Carrasquilla - Quantum States with Neural Networks: Representations and Tomography

Intervenant(s) :

Juan Carrasquilla, Vector Institute, Toronto

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Réseaux de neurones, apprentissage et physique quantique

04 - Réseaux de neurones, apprentissage et physique quantique : Représentations des états quantiques fermioniques par réseaux de neurones

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Réseaux de neurones, apprentissage et physique quantique

Séminaire - Giuseppe Carleoi - Time-Dependent Neural Quantum States

Giuseppe Carleo, EPFL, Lausanne

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Réseaux de neurones, apprentissage et physique quantique

03 - Réseaux de neurones, apprentissage et physique quantique : Introduction à la tomographie quantique

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Réseaux de neurones, apprentissage et physique quantique

02 - Réseaux de neurones, apprentissage et physique quantique : Représentation des états quantiques par réseaux de neurones (Neural Quantum States).

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Réseaux de neurones, apprentissage et physique quantique

01 - Réseaux de neurones, apprentissage et physique quantique : Introduction à l'apprentissage par réseaux de neurones et survol des applications en physique quantique

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Réseaux de neurones, apprentissage et physique quantique

Séminaire - Filippo Vicentini - Neural Quantum States for Finite Temperature and Open Systems, with a Practical Introduction to NetKet

Filippo Vicentini, École polytechnique, Paris et EPFL, Lausanne

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Conférence - Assa Auerbach : Kubo Formulas for Strongly Correlated Hamiltonians (A Pedagogical Blackboard Tutorial)

Assa Auerbach, Department of Physics, Technion, Israel Institute of Technology

Operator Hyperspace representation of Kubo formulas.

Continued Fractions expansions for dynamical longitudinal conductivities.

Degeneracy-Projected Polarizations expression for DC Hall and thermal-Hall conductivities.

Static (equilibrium) calculation of DC Hall-type coefficients.

Examples: Conductivity of disordered lattice bosons, Interaction effects on Hall coefficient of t-J model.

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Conférence - Assa Auerbach : Computing Low Energy Effective Hamiltonians of Hubbard and Heisenberg Models in Two Dimensions by Contractor Renormalization

Assa Auerbach, Department of Physics, Technion, Israel Institute of Technology

The Higgs Mode and Quantum Criticality in Condensed Matter

Contractor Renormalization (CORE) invented for computing correlations in lattice gauge theories in 1996, is a very promising approach for deriving low energy effective Hamiltonians of condensed matter lattice models. CORE identifies the low energy degrees of freedom and their interactions up to the range of truncation. Truncation error is controlled by the entanglement lengthscale, similarly to the convergence of DMRG. Examples of CORE results the derivation of Plaquette Boson-Fermion phenomenology for cuprate superconductors, and prediction of p6 symmetry breaking in the gapped spin liquid of the Heisenberg Kagome model.

Antoine Georges

Physique de la matière condensée

Année 2022-2023

Conférence - Assa Auerbach : Correlations and Transport in Strongly Interacting Phases of Condensed Matter

Assa Auerbach, Department of Physics, Technion, Israel Institute of Technology

The Higgs Mode and Quantum Criticality in Condensed Matter

The 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.