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Journal Articles Physical Review E Year : 2017

Low thermal fluctuations in a system heated out of equilibrium

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Abstract

We study the mechanical fluctuations of a micrometer sized silicon cantilever subjected to a strong heat flow, thus having a highly non-uniform local temperature. In this non-equilibrium steady state, we show that fluctuations are equivalent to the thermal noise of a cantilever at equilibrium around room temperature, while its mean local temperature is several hundred of degrees higher. Changing the mechanical dissipation by adding a coating to the cantilever, we recover the expected rise of fluctuations with the mean temperature. Our work demonstrates that inhomogeneous dissipation mechanisms can decouple the amplitude of thermal fluctuations from the average temperature. This property could be useful to understand out-of-equilibrium fluctuating systems, or to engineer low noise instruments.
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Dates and versions

ensl-01399273 , version 1 (24-11-2016)
ensl-01399273 , version 2 (05-04-2017)

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Mickael Geitner, Felipe A. Aguilar Sandoval, Éric Bertin, Ludovic Bellon. Low thermal fluctuations in a system heated out of equilibrium. Physical Review E , 2017, 95, pp.032138. ⟨10.1103/PhysRevE.95.032138⟩. ⟨ensl-01399273v2⟩
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