Weak wave turbulence as a precursor to universal coarsening in a homogeneous Bose gas
- URL: http://arxiv.org/abs/2605.22906v1
- Date: Thu, 21 May 2026 18:00:19 GMT
- Title: Weak wave turbulence as a precursor to universal coarsening in a homogeneous Bose gas
- Abstract summary: Relaxation and condensation of an isolated low-energy Bose gas provide an ideal setting for the study of the universal features of far-from-equilibrium many-body dynamics.<n>For a homogeneous Bose gas with tunable interactions, we show that the former also has a universal description, within the framework of weak wave turbulence (WWT)
- Score: 6.833587869460754
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Relaxation and condensation of an isolated low-energy Bose gas provide an ideal setting for the study of the universal features of far-from-equilibrium many-body dynamics and the emergence of long-range order. Conceptually, the emergence of such order involves two steps: the formation of local coherence, on a system-specific microscopic lengthscale, and the spreading of coherence, over lengthscales much larger than any microscopic scale. The latter is understood in terms of universal phase-ordering kinetics, or coarsening, characterized by an algebraic growth of the coherence length. Here, for a homogeneous Bose gas with tunable interactions, we show that the former also has a universal description, within the framework of weak wave turbulence (WWT). Specifically, the initial transport of particles to low momenta corresponds to an inverse turbulent cascade that is, in agreement with the WWT theory, characterized by a power-law momentum distribution, with exponent $γ= 2.4(1)$, and transport times ${\propto} (na)^{-2}$, where $n$ is the gas density and $a$ the $s$-wave scattering length.
Related papers
- A Bogoliubov-ratio framework for quantum-information diagnostics of time-dependent two-mode Boson Hamiltonian [10.22413990748989]
We present a compact and unified framework for quantum-information diagnostics of time-dependent two-mode bosonic systems.<n>We demonstrate the utility of this framework in two distinct non-stationary setups: primordial cosmological perturbations and a chirped-pulse nondegenerate optical parametric amplifier.
arXiv Detail & Related papers (2026-07-27T13:21:40Z) - Breathing mode of quantum droplets in dipolar quantum gases: A sum-rule analysis [7.809635348931763]
We theoretically investigate the ground-state properties and breathing-mode collective excitations of three-dimensional dipolar Bose gases in anisotropic harmonic traps.<n>Our work offers a rigorous and highly accurate framework to characterize collective excitations in dipolar quantum gases.
arXiv Detail & Related papers (2026-06-28T12:23:25Z) - Controlling radiative dynamics of a giant $Λ$-type atom via interference induced by the vacuum of a waveguide [11.482712501609557]
We investigate a $$-type giant atom (GA) whose both transition coupled to the guided modes of a one-dimensional (1D) waveguide at two spatially separated points.<n>The spontaneous emission properties of this GA is investigated by solving the delay-differential equation for the amplitude of the 3GA in its excited state.<n>And an exact Markovian dynamics is also found when $dgeq L$ via the inference by adjusting the energy spacing and the inherent time delay besides the complex phases in the atom-light coupling.
arXiv Detail & Related papers (2026-06-24T08:58:18Z) - Nonthermal Dynamics and Scar-Like Spectral Structures in a High-Spin Fermi Gas [12.044767899698208]
We investigate nonequilibrium dynamics and weak ergodicity breaking in a harmonically trapped spin-$3/2$ Fermi gas by using the time-dependent Hartree-Fock equation.<n>We find that the long-lived coherent oscillations originate from collective phase interference associated with a quasi-regular spectral structure embedded in the many-body continuum.
arXiv Detail & Related papers (2026-03-10T12:15:41Z) - Symmetry-protected topology and deconfined solitons in a multi-link $\mathbb{Z}_2$ gauge theory [45.88028371034407]
We study a $mathbbZ$ lattice gauge theory defined on a multi-graph with links that can be visualized as great circles of a spherical shell.<n>We show that this leads to state-dependent tunneling amplitudes underlying a phenomenon analogous to the Peierls instability.<n>By performining a detailed analysis based on matrix product states, we prove that charge deconfinement emerges as a consequence of charge-fractionalization.
arXiv Detail & Related papers (2026-03-02T22:59:25Z) - A Nonequilibrium Equation of State for a Turbulent 2D Bose Gas [7.685576599102702]
We experimentally construct an equation for a direct energy cascade in a turbulent two-dimensional Bose gas.<n>Our equation of state links the cascade amplitude with the underlying scale-invariant energy flux.
arXiv Detail & Related papers (2026-02-05T19:05:17Z) - Unsplit Spreading: An Overlooked Signature of Long-Range Interaction [13.490631794544166]
Unsplit spreading can occur only when $(k)$ develops singular features, precisely what long-range interactions enable.<n>We show that unsplit spreading emerges in realistic open quantum systems, such as 1D and 2D subwavelength atomic arrays.<n>Our work establishes unsplit spreading as an experimentally accessible, smoking-gun signature of singular band structure induced by long-range physics.
arXiv Detail & Related papers (2026-01-22T08:24:57Z) - Observation of critical scaling in the Bose gas universality class [0.0]
Critical exponents characterize the divergent scaling of thermodynamic quantities near phase transitions.<n>We report the observation of critical scaling in a two-dimensional quantum gas of essentially noninteracting photons.
arXiv Detail & Related papers (2025-11-18T18:53:38Z) - Ground state phases of the two-dimension electron gas with a unified variational approach [9.572992929157014]
Current understanding of the ground state of the 2DEG relies on quantum Monte Carlo calculations.
We use a single variational ansatz, a general backflow-type wave function using a message-passing neural quantum state architecture, for a unified description across the entire density range.
arXiv Detail & Related papers (2024-05-29T18:00:01Z) - Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas [0.0]
We observe an inverse turbulent-wave cascade, from small to large lengthscales, in a driven homogeneous 2D Bose gas.<n>In further experiments, based on anisotropic driving, we reveal the complete qualitative picture of how the steady-state cascade forms.
arXiv Detail & Related papers (2024-05-02T17:59:55Z) - Universal Coarsening in a Homogeneous Two-Dimensional Bose Gas [0.0]
Coarsening of an isolated far-from-equilibrium quantum system is a paradigmatic many-body phenomenon.
We observe universal scaling in the coarsening of a homogeneous two-dimensional Bose gas, with exponents that match analytical predictions.
arXiv Detail & Related papers (2023-12-14T18:59:31Z) - Quantum chaos and thermalization in the two-mode Dicke model [77.34726150561087]
We discuss the onset of quantum chaos and thermalization in the two-mode Dicke model.
The two-mode Dicke model exhibits normal to superradiant quantum phase transition.
We show that the temporal fluctuations of the expectation value of the collective spin observable around its average are small and decrease with the effective system size.
arXiv Detail & Related papers (2022-07-08T11:16:29Z) - Three-Body Scattering Hypervolume of Particles with Unequal Masses [8.35070936044077]
We analyze the collision of three particles with arbitrary mass ratio at zero collision energy.
We generalize the three-body scattering hypervolume $D$ first defined for identical bosons in 2008.
We derive some properties of a two-component Bose gas with two-body scattering lengths.
arXiv Detail & Related papers (2021-03-25T14:29:44Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.