Conférences  >  Physique  >  Matériaux quantiques, basses températures  >  Allemagne

This workshop is organized by SPICE as part of the Gutenberg International Conference Center (GICC) at Johannes Gutenberg University Mainz (JGU).

The conference aims at the interdisciplinary experiment of bringing together experts from solid state and quantum optics, in order to foster dialogue at the interface of the two communities. The goal is to plant the seed of a novel hybrid research area, where solid state systems are treated on the same footing as AMO driven-dissipative platforms, and, viceversa, where quantum optics can be reshaped by using concepts from spintronics, magnetism and the physics of correlated materials.We invite and encourage the contribution of selected speakers advancing the frontiers of any of the following fields:(i) dynamical phase transitions in driven-dissipative atomic or spin ensembles, ranging from traditional AMO platforms to spintronics and solid state devices;

This workshop is organized by SPICE as part of the Gutenberg International Conference Center (GICC) at Johannes Gutenberg University Mainz (JGU).

Quantum materials driven out of equilibrium by strong electric fields exhibit phenomena that challenge our physical understanding of solids and could be implemented in future device technologies. Examples include photo- and current-induced transitions to metastable hidden phases, the ultrafast optical manipulation of ferroelectricity and magnetism, light-induced superconductivity, and the creation of photon-dressed topological states. While much progress has been made in characterizing these effects, turning them into real-world functionalities requires stabilizing them at high temperature, on long time scales, and with minimal input power. These challenges are inherently of a materials nature. The focus of this workshop is to bring together experts in quantum materials synthesis (single crystals, thin films, vdW heterostructures) with experimentalists and theorists investigating non-equilibrium phenomena to spark a new generation of non-equilibrium quantum materials design – that is, to create quantum materials that are specifically designed for their out-of-equilibrium response to optical and electrical perturbations. The long-term goal is to create a feedback loop between materials synthesis, experimental characterization and theory for non-equilibrium physics, similar to the successful strategies employed in equilibrium quantum materials design.

Max-Planck-Institute for Solid State Research

Materials with strongly correlated quantum particles are at the forefront of present solid state research. Understanding the experimental properties of novel quantum materials crucially relies on the application of cutting-edge analytical and numerical tools. This workshop aims at bringing together world-leading experts in both analytical and numerical theory to advance the current perspective on important questions of the field: What are the signatures of quantum order in newly synthesized experimental setups? Which aspects of quantum materials can be described on the model level? What are the computational and algorithmic boundaries hindering the solution of the many-body problem? What is the nature of phase transitions between these novel states of matter?

Organizing committee;     Email.: cnqm2023@fkf.mpg.de

In a classic paper 50 years ago, Kugel and Khomskii demonstrated that in strongly-correlated systems orbital ordering can arise from a purely electronic super-exchange mechanism and not just the conventional co-operative Jahn-Teller effect. This work opened the field of orbital physics — a field which, since then, is undergoing continuous growth. It was understood that, beside orbital ordering, super-exchange can give rise to the orbital analogue of spin-liquid states. It was shown that the directional character of the orbitals can introduce anisotropic super-exchange interactions, which, in a simplified setting, are described by compass models, a prototype for the Kitaev model. This opened new avenues of its own. More surprising phenomena arise from the entanglement of spin and orbital degrees of freedom. New developments aim at dynamically tuning orbital occupations by pushing the system out of equilibrium, and at orbital-controlled electronics.

The goal of this year’s school is to provide students with an overview of the state-of-the art in the field of orbital physics in strongly correlated systems and the techniques used to investigate them. After introducing fundamental models and effects, lectures will focus on these effects in real materials, with introductions to crystallography and symmetries, methods for building minimal tight-binding Hamiltonians, the Jahn-Teller effect, and Coulomb-enhancements of the Jahn-Teller effect. Advanced lectures will address orbital ordering, orbital liquids and Kitaev materials, as well as theoretical approaches, from self-interaction corrected density functionals to dynamical mean-field theory and beyond. Experimental lectures will present probes of spin, orbital, and charge degrees of freedom, techniques to image orbitals and orbital ordering, as well as orbitally-controlled transport phenomena.

Email.: correl23@fz-juelich.de

Orbital physics, orbital ordering, multi-orbital Hubbard model, strong-correlations, DMFT, Jahn-Teller, group theory, Kitaev materials, Mott transition, quantum Montecarlo, spin and orbital liquid, theory and experiments

Physique de la matière condensée et des matériaux,    Physique numérique

Messe Stuttgart

The whole world is made of quanta. New technical solutions, e.g., more powerful computers, more precise measuring devices, but also increased security in data communication are pushing onto the market. There are many possible applications and the aim is to build an international ecosystem in which Quantum Effects plays a pioneering European role. Quantum Effects as a new format creates an application-oriented forum in this ecosystem and links science, start-ups and business, making innovative quantum technologies visible in Europe. It will take place for the first time at Messe Stuttgart on 10 and 11 October 2023.

Quantum computing, quantum technologies, software, sensing, communication

Mécanique quantique et l'information quantique,    Salons, foire-exposition

Wilhelm-and-Else Heraeus Foundation

Strange metals are one of the most prominent frontiers of condensed matter physics. While conventional metals are well described by Landau’s Fermi liquid theory – i.e. a quantum liquid of long-lived, local, electron-like quasiparticles – strange metals defy this paradigm. Here, the local low-energy excitations are extremely short lived and the adiabatic connection to free electrons breaks down. As a consequence, strange metals display a multitude of unusual experimental phenomena, including anomalous charge transport (for example linear in temperature and magnetic field scaling of resistance), singular thermodynamics, and characteristic dynamical scaling. Experimentally, strange metallic behavior has been reported in a variety of experimental systems including high-temperature superconductors and heavy fermion materials. Recent progress in experimental control and device fabrication not only allowed for much more accurate studies of these classic materials, but, in the process, also revealed strikingly new properties such as the unexpectedly simple and yet puzzle scaling of the magnetoresistance. Present-day technology adds novel quantum emulators such as twisted van-der-Waals heterostructures and cold atomic gases to the list of experimental systems displaying strange metallic behavior. At the same time, most recent theories explaining strange metallic behavior resort – from a healthy variation of perspectives – to such diverse concepts as exotic (beyond-Landau) critical quantum fluctuations, effective dual gravity models, and quantum hydrodynamics. As such, this WE-Heraeus Seminar aims at bringing together key figures in the research on strange metals. A particularly important mission is the fruitful cross-talks between experimentalists working on a variety of platforms, as well as theorists with different perspectives of the problem.

Organizing committee;     Email.: e.koenig@fkf.mpg.de

Physique de la matière condensée et des matériaux,    Théorie de l'information quantique et informatique quantique