27 citations · 110 across the 16 of their papers we have counts for
16 papers
The Fermi-Pasta-Ulam-Tsingou problem after 70 years: toward universal laws of thermalization in lattice systems in the thermodynamic limit
Weicheng Fu, Zhen Wang, Wei Lin +4
The Fermi--Pasta--Ulam--Tsingou (FPUT) problem provides a paradigmatic framework for understanding thermalization in weakly nonlinear many-body Hamiltonian systems. This focused re…
From Near-Integrable to Far-from-Integrable: A Unified Picture of Thermalization and Heat Transport
Weicheng Fu, Zhen Wang, Yisen Wang +2
Whether and how a system approaches equilibrium is central in nonequilibrium statistical physics, crucial to understanding thermalization and transport. Bogoliubov's three-stage (i…
Multi-Type Instability Processes of Periodic Orbits in Nonlinear Chains
Weicheng Fu, Zhen Wang, Yong Zhang +1
Nonlinear normal modes are periodic orbits that survive in nonlinear many-body Hamiltonian systems, and their instability is crucial for relaxation dynamics. Here, we study the ins…
A general multi-wave quasi-resonance theory for lattice energy diffusion
Wei Lin, Weicheng Fu, Zhen Wang +2
In this letter, a multi-wave quasi-resonance framework is established to analyze energy diffusion in classical lattices, uncovering that it is fundamentally determined by the chara…
Nonintegrability-driven Transition from Kinetics to Hydrodynamics
Weicheng Fu, Zhen Wang, Yisen Wang +2
Nonintegrability plays a crucial role in thermalization and transport processes in many-body Hamiltonian systems, yet its quantitative effects remain unclear. To reveal the connect…
The effect of dressing on thermalization of interacting waves
Zhen Wang, Yong Zhang, Hong Zhao
We propose a more general setup for prethermalization in the system of interacting waves. The idea lies in dividing the multi-wave interactions into trivial and nontrivial ones. Th…
The anti-Fermi-Pasta-Ulam-Tsingou problem in one-dimensional diatomic lattices
Sihan Feng, Weicheng Fu, Yong Zhang +1
We study the thermalization dynamics of one-dimensional diatomic lattices (which represents the simplest system possessing multi-branch phonons), exemplified by the famous Fermi-Pa…
Thermalization in asymmetric harmonic chains
Weicheng Fu, Sihan Feng, Yong Zhang +1
The symmetry of the interparticle interaction potential (IIP) plays a critical role in determining the thermodynamic and transport properties of solids. This study investigates the…
Effect of pressure on thermalization of one-dimensional nonlinear chains
Weicheng Fu, Yong Zhang, Hong Zhao
Pressure plays a vital role in changing the transport properties of matter. To understand this phenomenon at a microscopic level, we here focus on a more fundamental problem, i.e.,…
Instability dynamics of nonlinear normal modes in the Fermi-Pasta-Ulam-Tsingou chains
Liangtao Peng, Weicheng Fu, Yong Zhang +1
Nonlinear normal modes are periodic orbits that survive in nonlinear chains, whose instability plays a crucial role in the dynamics of many-body Hamiltonian systems toward thermali…
Thermalization of two- and three-dimensional classical lattices
Zhen Wang, Weicheng Fu, Yong Zhang +1
Whether and how a system reaches thermalization is a fundamental issue of statistical physics. While for one-dimensional lattices this issue has been intensively studied in terms o…
Nonintegrability and thermalization of one-dimensional diatomic lattices
Weicheng Fu, Yong Zhang, Hong Zhao
Nonintegrability is a necessary condition for the thermalization of a generic Hamiltonian system. In practice, the integrability can be broken in various ways. As illustrating exam…
Universal law of thermalization for one-dimensional perturbed Toda lattices
Weicheng Fu, Yong Zhang, Hong Zhao
The Toda lattice is a nonlinear but integrable system. Here we study the thermalization problem in one-dimensional, perturbed Toda lattices in the thermodynamic limit. We show that…
A New Strategy in Applying the Learning Machine to Study Phase Transitions
Rongxing Xu, Weicheng Fu, Hong Zhao
In this Letter, we present a new strategy for applying the learning machine to study phase transitions. We train the learning machine with samples only obtained at a non-critical p…
Universality of Energy Equipartition in One-dimensional Lattices
Weicheng Fu, Yong Zhang, Hong Zhao
We show that a general one-dimensional (1D) lattice with nonlinear inter-particle interactions can always be thermalized for arbitrarily small nonlinearity in the thermodynamic lim…
Effective phonon treatment of asymmetric interparticle interaction potentials
Weichen Fu, Hong Zhao
We propose an effective phonon treatment in one dimensional momentum-conserved lattice system with asymmetric interparticle interaction potentials. Our strategy is to divide the po…