OpenQMBP2023: New perspectives in the out-of-equilibrium dynamics of open many-body quantum systems

Session

Conference: Transport, Generalised Hydrodynamics and open systems

27 juin 2023, 10:00

Institut Pascal

60. Implementation of protocols for measuring the rapidities distribution of a 1D Bose gas

Lea Dubois

27/06/2023 10:30

After relaxation, an integrable quantum system, in particular a one-dimensional gas of bosons, is characterized by the rapidities distribution, a quantity preserved throughout the dynamics. The rapidities distribution is nothing else than the asymptotic momentum distribution of particles after a one-dimensional expansion of the system. This definition is directly linked to an experimental...

61. One-particle density matrix of the out-of-equilibrium Tonks-Girardeau gas: exact results from Quantum Generalized Hydrodynamics

Stefano Scopa

27/06/2023 10:50

Understanding the non-equilibrium dynamics of many-body quantum systems is a notoriously hard task due to the exponential increase of the Hilbert space dimension with the number of the system’s components. This prevented, for a long time, a direct comparison between theory and the available experimental measures with ultracold atoms and ions. In recent years, the advent of Generalized...

65. Emergent hydrodynamics and Pauli blocking in quasi-1D Bose gases

Frederik Skovbo Moller (TU Wien)

27/06/2023 11:10

Confining atoms to a single line (1D) results in a system, whose elementary excitations are quasi-particles with properties that may differ significantly from the atoms; in a Bose gas, correlation effects due to interactions in 1D prevent two quasi-particle excitations from occupying the same quantum state. This imposed Pauli exclusion leads to effective fermionization of the quantum Bose gas...

69. Dynamics of charge fluctuations and symmetry-resolved entanglement

Dr Katja Klobas (University of Nottingham)

27/06/2023 12:20

Due to its probabilistic nature, a measurement process produces a distribution of possible outcomes. This distribution — or its Fourier transform known as full counting statistics (FCS) — contains much more information than say the mean value of the measured ob- servable and accessing it is sometimes the only way to obtain relevant information about the system.
In fact, the FCS is the limit...

64. Hidden strong symmetries and quasi-local charges in a local Lindblad system

Balázs Pozsgay

27/06/2023 12:40

We consider an open spin chain with external driving in the bulk, described by the Lindblad equation. We show that in certain cases the system can have hidden strong symmetries, in the form of quasi-local operators. These lead to conserved charges, and the existence of multiple NESS: The system will keep memory of the initial state, even though the obvious symmetries of the Hamiltonian are broken.

67. Anomalous fluctuations

Enej Ilievski (University of Ljubljana)

27/06/2023 14:30

I will discuss several examples of non-ergodic dynamical systems with anomalous charge fluctuations.

62. Spin Transport in Perturbed Quantum Integrable Chains

Sourav Nandy

27/06/2023 14:50

In the context of quantum transport, the XXZ (or anisotropic Heisenberg) chain is a paradigmatic many-body model, featuring a wide spectrum of spin transport behaviour at finite temperature. Although the unperturbed model is analytically solvable, understanding the effects of even weak integrability-breaking perturbations (IBP) remains an open problem. The primary aim of this talk is to...

63. TBA

Laura FOINI (CNRS)

27/06/2023 15:20

68. Long-range correlations from Euler hydrodynamics

Takato Yoshimura

27/06/2023 15:40

Long-range correlations have been known to exist in various situations in many-body systems. In this talk, I will show that novel hydrodynamic long-range correlations can occur in many-body systems that support ballistic transport. To describe these correlations quantitatively, I will also introduce a ballistic version of macroscopic fluctuation theory (MFT), which we call ballistic MFT (BMFT).

70. Dynamics of scrambling of information, from shock waves to Fisher‐KPP

Camille Aron

Quenched disorder slows down the scrambling of quantum information. I will
explain how conventional tools of quantum transport theory can be adapted
to derive an effective field theory of scrambling. Specifically, I'll focus
on realistic metals with both inelastic and elastic scattering, due to
interaction and disorder. I will demonstrate that disorder drives a phase
transition in the...

66. TBA

Maurizio FAGOTTI (LPTMS)