Brownian motion in superfluid $^4$He

Details Brownian motion in superfluid $^4$He Brownian motion in superfluid $^4$He

2011-07-03

arxiv.org/abs/1107.0485v2

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

We propose to study the Brownian motion of a classical microsphere submerged in superfluid $^4$He using the recent laser technology as a direct investigation of the thermal fluctuations of quasiparticles in the quantum fluid. By calculating the temperature dependence of both the friction coefficient and the strength of the random force, we show that the resonant mode of the fluctuational motion can be fully resolved by the present technology. Contrary to the previous work, it is found that the roton contribution is not negligible, and it even becomes dominant when the temperature is above 0.76\,K.

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