Inverse thermodiffusion of active matter in temperature gradient systems

Yuheng Zhong and Weirong Zhong

Physica A: Statistical Mechanics and its Applications, 2024, vol. 633, issue C

Abstract: We have revealed an inverse thermodiffusion phenomenon for active particles under temperature gradient in one-species systems. This counterintuitive behavior is supported by numerical calculations as well as theoretical analyses. It is presented that the active particles flow from high-temperature to low-temperature regions when the self-driving force is small. On the contrary, the active particles can flow from low-temperature to high-temperature regions as long as the self-driving force is large enough. The mass current reversal phenomenon can be explained analytically from the special swimming pressures of the active particles. The P é clet numbers defined in our work indicate a potential application in separating the particles with different activities. The findings may bring a new understanding of the physical properties of active matter and provide enlightenment for the study of the non-equilibrium collective transport of active particles.

Keywords: Active Matter; Thermodiffusion; Anomalous; Statistical machines; Brownian particle; Molecular Dynamics (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:633:y:2024:i:c:s0378437123009615

DOI: 10.1016/j.physa.2023.129406

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