2011/07/03 by Xiao Li, Li, Xiao, Ran Cheng +5
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Computational Physics and Python Applications #FOS: Physical sciences #Optics (physics.optics) #Other Condensed Matter (cond-mat.other) #Quantum Physics (quant-ph) #Quantum, superfluid, helium dynamics #Statistical Mechanics (cond-mat.stat-mech)
paper · pdf · doi:10.48550/arxiv.1107.0485
openalex publication_date 2011/07/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose to study the Brownian motion of a classical microsphere submerged in superfluid 4He 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.