Stationary state of harmonic chains driven by boundary resetting

Abstract

We study the nonequilibrium steady state (NESS) of an ordered harmonic chain of $N$ oscillators connected to two walls which undergo diffusive motion with stochastic resetting. The intermittent resettings of the walls effectively emulate two nonequilibrium reservoirs that exert temporally correlated forces on the boundary oscillators. These reservoirs are characterized by the diffusion constant and resetting rates of the walls. We find that, for any finite $N$, the velocity distribution remains non-Gaussian, as evidenced by a non-zero bulk kurtosis that decays $\sim N^{-1}$. We calculate the spatio-temporal correlation of the velocity of the oscillators $⟨v_l(t)v_{l^{\prime }}(t^{\prime })⟩$ both analytically as well as using numerical simulation. The signature of the boundary resetting is present at the bulk in terms of the two-time velocity correlation of a single oscillator and the equal-time spatial velocity correlation. For the resetting driven chain, the two-time velocity correlation decay as $t^{-\frac{1}{2}}$ at the large time, and there exists a non-zero equal-time spatial velocity correlation $⟨v_l(t)v_{l^{\prime }}(t^{\prime })⟩$ when $l\ne l^{\prime }$. A non-zero average energy current will flow through the system when the boundary walls reset to their initial position at different rates. This average energy current can be computed exactly in the thermodynamic limit. Numerically we show that the distribution of the instantaneous energy current at the boundary is independent of the system size. However, the distribution of the instantaneous energy current in the bulk approaches a stationary distribution in the thermodynamic limit.

24 pages. Comments are welcome

References in corpus (11)

• Heat Transport in low-dimensional systems
• First order transition for the optimal search time of Lévy flights with resetting
• Optimal mean first-passage time for a Brownian searcher subjected to resetting: experimental and theoretical results
• Generalized energy equipartition in harmonic oscillators driven by active baths
• Local Temperature and Universal Heat Conduction in FPU chains
• Large deviations of heat flow in harmonic chains
• Stochastic resetting in interacting particle systems: A review
• Effects of active fluctuations on energetics of a colloidal particle: superdiffusion, dissipation and entropy production
• Heat transport in ordered harmonic lattices
• Work fluctuations for a Brownian particle driven by a correlated external random force
• Energetics of critical oscillators in active bacterial baths

Cited by in corpus (1)

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