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- W4296554900 abstract "Thermodynamics strongly restricts the direction of heat flow in static macroscopic thermal diffusive systems. To overcome this constraint, spatiotemporal modulated systems are used instead. Here, we unveil the underlying geometric heat pump effect in macroscopic driven thermal diffusion, which is crucial for achieving thermal nonreciprocity. We obtain a geometric expression to formulate the nontrivial current in a driven system, manifesting as an extra pumped heat ably diffusing from cold to hot that has no analogy in static setups. Moreover, we analyze the underlying geometric curvature of driven diffusive systems and derive no-pumping restriction theorems that constrain the thermal action under modulations and guide the optimization of driving protocols. Following the restrictions from geometry, we finally implement a minimum experiment and observe the predicted pumped heat in the absence of thermal bias at every instant, which is independent of the driving speed in the adiabatic limit, clearly validating the geometric theory. An extension of the geometric pump effect and no-pumping restrictions to macroscopic mass diffusion governed by Fick's law is also discussed. These results pave the way for designing and implementing nonreciprocal and topological diffusive systems under spatiotemporal modulations." @default.
- W4296554900 created "2022-09-21" @default.
- W4296554900 creator A5011893060 @default.
- W4296554900 creator A5018020971 @default.
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- W4296554900 date "2022-09-12" @default.
- W4296554900 modified "2023-09-28" @default.
- W4296554900 title "Geometric heat pump and no-go restrictions of nonreciprocity in modulated thermal diffusion" @default.
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- W4296554900 doi "https://doi.org/10.1103/physreve.106.l032102" @default.
- W4296554900 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36266907" @default.
- W4296554900 hasPublicationYear "2022" @default.
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