Quantum friction in the Hydrodynamic Model

Wu, Kunmin; Schmidt, Thomas; Farias, Maria Belen

Reference : Quantum friction in the Hydrodynamic Model


	Document type :	E-prints/Working papers : Already available on another site
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/49693

Title :	Quantum friction in the Hydrodynamic Model
Language :	English
Author, co-author :	Wu, Kunmin [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
	Schmidt, Thomas [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
	Farias, Maria Belen [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Publication date :	Dec-2020
Peer reviewed :	Yes
Abstract :	[en] We study the phenomenon of quantum friction in a system consisting of a polarizable atom moving at a constant speed parallel to a metallic plate. The metal is described using a charged hydrodynamic model for the electrons. This model featuring long-range interactions is appropriate for a clean metal in a temperature range where scattering due to Coulomb interactions dominates over the scattering of electron by impurities. We find that a quantum friction force between the atom and the metal surface exists even in the absence of intrinsic damping in the metal, but that it only starts once the velocity of the atom exceeds the effective speed of sound in the metal. We argue that this condition can be fulfilled most easily in metals with nearly empty or nearly filled bands. We make quantitative predictions for the friction force to the second and fourth order in the atomic polarizability, and show that the threshold behavior persists to all orders of the perturbation theory.
Funders :	Fonds National de la Recherche - FnR
Permalink :	http://hdl.handle.net/10993/49693
source URL :	https://arxiv.org/abs/2012.10204

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