Observing the loss and revival of long-range phase coherence through disorder quenches
arXiv:1911.04748 · doi:10.1073/pnas.2111078118
Abstract
Relaxation of quantum systems is a central problem in nonequilibrium physics. In contrast to classical systems, the underlying quantum dynamics results not only from atomic interactions but also from the long-range coherence of the many-body wave function. Experimentally, nonequilibrium states of quantum fluids are usually created using moving objects or laser potentials, directly perturbing and detecting the system's density. However the fate of long-range phase coherence for hydrodynamic motion of disordered quantum systems is less explored, especially in three dimension. Here, we unravel how the density and phase coherence of a Bose-Einstein condensate of Li molecules respond upon quenching on or off an optical speckle potential. We find that, as the disorder is switched on, long-range phase coherence breaks down one order of magnitude faster than the density of the quantum gas responds. After removing it, the system needs two orders of magnitude longer times to reestablish quantum coherence, compared to the density response. We compare our results with numerical simulations of the Gross-Pitaevskii equation on large three-dimensional grids, finding an overall good agreement. Our results shed light on the importance of long-range coherence and possibly long-lived phase excitations for the relaxation of nonequilibrium quantum many-body systems.
arXiv comment15 pages, 10 figures
References in corpus (37)
- Quantum sensing
- Vortex formation in a stirred Bose-Einstein condensate
- Collapse and Revival of the Matter Wave Field of a Bose-Einstein Condensate
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Berezinskii-Kosterlitz-Thouless Crossover in a Trapped Atomic Gas
- Non-equilibrium coherence dynamics in one-dimensional Bose gases
- Weakly bound dimers of fermionic atoms
- Fermionic transport in a homogeneous Hubbard model: Out-of-equilibrium dynamics with ultracold atoms
- Fortran programs for the time-dependent Gross-Pitaevskii equation in a fully anisotropic trap
- A Bose-Einstein condensate in a random potential
- Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
- Ultrafast many-body interferometry of impurities coupled to a Fermi sea
- Emergence of turbulence in an oscillating Bose-Einstein condensate
- Emergence of a Turbulent Cascade in a Quantum Gas
- Precise characterization of ^6Li Feshbach resonances using trap-sideband resolved RF spectroscopy of weakly bound molecules
- Quantum quench in an atomic one-dimensional Ising chain
- Kolmogorov spectrum of superfluid turbulence: numerical analysis of the Gross-Pitaevskii equation with the small scale dissipation
- Characterization of reconnecting vortices in superfluid helium
- Strong saturation absorption imaging of dense clouds of ultracold atoms
- Coherent Matter Wave Transport in Speckle Potentials
- Ground state of a homogeneous Bose gas: a diffusion Monte Carlo calculation
- Damping of low-energy excitations of a trapped Bose condensate at finite temperatures
- Bose-Einstein condensation into non-equilibrium states studied by condensate focusing
- Phase Coherence and Superfluid-Insulator Transition in a Disordered Bose-Einstein Condensate
- Vortices and turbulence in trapped atomic condensates
- Probing the Bose-Glass--Superfluid Transition using Quantum Quenches of Disorder
- Observing the Formation of Long-range Order during Bose-Einstein Condensation
- Analytical description of a trapped semi-ideal Bose gas at finite temperature
- Smoothing effect and delocalization of interacting Bose-Einstein condensates in random potentials
- Dynamics of a classical gas including dissipative and mean field effects
- Collective dynamics and expansion of a Bose-Einstein condensate in a random potential
- Dilute Bose gas with correlated disorder: A Path Integral Monte Carlo study
- Measurement of spectral functions of ultracold atoms in disordered potentials
- OpenMP GNU and Intel Fortran programs for solving the time-dependent Gross-Pitaevskii equation
- Hydrodynamic behavior in expanding thermal clouds of Rb-87
- Ultracold Fermi gases in the BEC-BCS crossover: a review from the Innsbruck perspective
- Elliptic flow in a strongly-interacting normal Bose gas
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- Out-of-equilibrium dynamical properties of Bose-Einstein condensates in a ramped up weak disorder