Abstract
We investigate the energy transport in simple networks consisting of one-dimensional nonlinear chain with self-coupled loop. The impacts of the loop length and coupling strength on the heat flux and spatiotemporal correlation functions of energy–momentum fluctuations are discussed via Langevin thermostats generated by spatiotemporal noise. For thermostats at different temperatures, the spatiotemporal ones can weaken the total heat flux of the system in comparison with the normal Langevin ones. The total heat flux will increase when the dispersal kernel or the loop length or the coupling strength increases, while the heat flux in the loop does not change as the dispersal kernel or the loop length increases, and decrease as the coupling strength increases. Then the underlying mechanism of heat flux can be well explained by the phonon spectra and Fourier’s law. For the thermostats at the same temperatures, it is shown that the peak of the propagating front for the trunk (PT) and the peak of the propagating front from the coupling position to the outer trunk (PC) do not change almost for the normal Langevin and spatiotemporal thermostats. The PT decreases and PC increases when the loop length or coupling strength increases. Our results may contribute to further understanding of thermal information appearing in coupled nanotubes, polymer chains and biological networks.
Graphical abstract
Heat flux J vs the coupling strength k. The red circle, blue triangle and green five-pointed star refer to the total heat flux, heat flux in the self-coupled loop and shortcut, respectively. The length of the FPU-\(\beta \) lattice \(N = 500,\) coupling at \(i = 151, j =350\).
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This manuscript has no associated data or the data will not be deposited. [Authors comment: The paper contents are purely theoretical, and did not need any data.]
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Acknowledgements
We thank Prof. Z. Liu, Dr. Y. Luo and T. Huang for valuable discussions. This work was supported by the National Natural Science Foundation of China under Grant no. 12005166, the Yunnan Fundamental Research Projects (Grant no. 2019FI002 and 202101AS070018), Yunnan Province Ten Thousand Talents Plan Young and Elite Talents Project, and Yunnan Province Computational Physics and Applied Science and Technology Innovation Team, and the Natural Science Foundation of Shaanxi Provincial Department of Education under Grant no. 20JK0764.
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SW: writing—original draft preparation; CZ: original idea, funding acquisition; FY, KX and BL: reviewing and editing. All authors contributed to the preparation of the manuscript.
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Wang, S., Zeng, C., Yang, F. et al. Energy diffusion of simple networks under the spatiotemporal thermostats. Eur. Phys. J. B 94, 236 (2021). https://doi.org/10.1140/epjb/s10051-021-00247-z
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DOI: https://doi.org/10.1140/epjb/s10051-021-00247-z