Observation of individual tracer atoms in an ultracold dilute gas

Autor:	Artur Widera, Daniel Mayer, Eric Lutz, Farina Kindermann, Felix Sharipov, Michael Hohmann, Tobias Lausch
Jazyk:	angličtina
Rok vydání:	2016
Předmět:	Physics::Fluid Dynamics Statistical Mechanics (cond-mat.stat-mech) Atomic Physics (physics.atom-ph) Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Physics - Fluid Dynamics Astrophysics::Galaxy Astrophysics Condensed Matter - Statistical Mechanics Physics - Atomic Physics
Zdroj:	Web of Science
Popis:	Understanding the motion of a tracer particle in a rarefied gas is of fundamental and practical importance. We report the experimental investigation of individual Cs atoms impinging on a dilute cloud of ultracold Rb atoms with variable density. We study the nonequilibrium relaxation of the initial nonthermal state and detect the effect of single collisions which has eluded observation so far. We show that after few collisions, the measured spatial distribution of the light tracer atoms is correctly described by a generalized Langevin equation with a velocity-dependent friction coefficient, over a large range of Knudsen numbers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39940041136069022a348e2ef2d3ce76 http://arxiv.org/abs/1611.01452 Zobrazit plný text záznamu