Российский Квантовый Центр Russian Quantum Center

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Open RQC colloquium. Lecture 28


The Twenty Eighth lecture "Spreading of information in out-of-equilibrium particle and spin systems with long-range interactions" in Open RQC Colloquium will be held in National University of Science and Technology MISIS (Moscow, Leninskiy prospekt 4) lecture hall № Б-536 (5th floor), on 22th of September 2017 at 10:00 a.m by Laurent Sanchez-Palencia, CNRS Research Director at the Center for Theoretical Physics (CPhT, Ecole Polytechnique, France).

Abstract

Understanding the dynamics of many-body quantum systems far from equilibrium is a major topics for the on-going development of quantum technologies. The realization of quantum simulators able to realize model Hamiltonians in the laboratory has open a new window on this topics. It is now possible to induce controlled dynamics of quantum systems in a variety of engineered devices in photonic systems, condensed-matter materials and ultracold quantum matter. It raises new challenges for both experiments and theory. For instance, the spreading of information in lattice quantum systems is constrained by so-called causality Lieb-Robinson (LR) bounds. Bounded propagation has been observed in experimental realizations of various spin Hamiltonians. However, experiments, as well as numerics, show a dynamics that significantly deviates from the LR predictions. We review progress in understanding correlation spreading in particle and spin systems. In particular, we show that it features a double structure whose scaling laws can be related to a set of universal microscopic exponents that we determine. Our results shed new light on existing experimental and numerical observations, for which our analysis provides a unified picture, and opens new perspectives.

Biography

Professor Laurent Sanchez-Palencia is a Head of the Quantum Matter group at CPhT. Laurent Sanchez-Palencia graduated from Ecole Polytechnique in 1999 and earned a M2 degree in Quantum Physics at Ecole Normale Superieure in 2000. He joined Laboratoire Kastler Brossel where he recieved his PhD degree in 2003. He then spent one year at the Institute fur Theoretische Physik of the University of Hannover. In 2004-2016, he has hold a CNRS Researcher position at Institute d'Optique. In 2006, he founded the Ultracold Quantum Gases Theory team and he served as co-head of the Atom Optics group in 2012-2016. In 2016, he was appointed CNRS Research Director and joined the Center for Theoretical Physics of Ecole Polytechnique where he founded the Quantum Matter group. The past and present research activity of Laurent Sanchez-Palencia has focussed on the non linear dynamics of cold atoms, degenerate Bose-Fermi mixtures in optical lattices, disordered quantum gases and Anderson localization, strongly-interacting gases in low dimension, and out-of-equilibrium of correlated quantum systems. The work of Laurent Sanchez-Palencia on the theory of quantum gases has been recognized by an Humboldt fellowship (2003), an ANR young research grant (2010), a European Research Council award (2011), and the Leconte prize of the French Academy of Sciences (2012). In 2012, Laurent Sanchez-Palencia was elected Associate Professor of Statistical Physics and Quantum Optics at Ecole Polytechnique.

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