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O: Fachverband Oberflächenphysik
O 27: Tribology
O 27.7: Vortrag
Dienstag, 19. März 2024, 12:00–12:15, MA 144
Superfluidity meets the solid-state: frictionless mass-transport through a (5,5) carbon-nanotube — •Alberto Ambrosetti, Pier Luigi Silvestrelli, and Luca Salasnich — Università degli Studi di Padova (Italy)
Superfluidity is a well-characterized quantum phenomenon which entails frictionless-motion of mesoscopic particles through a superfluid, such as 4He or dilute atomic-gases at very low temperatures. As shown by Landau, the incompatibility between energy- and momentum-conservation, which ultimately stems from the spectrum of the elementary excitations of the superfluid, forbids quantum-scattering between the superfluid and the moving mesoscopic particle, below a critical speed-threshold. Here we predict that frictionless-motion can also occur in the absence of a standard superfluid, i.e. when a He atom travels through a narrow (5,5) carbon-nanotube (CNT). Due to the quasi-linear dispersion of the plasmon and phonon modes that could interact with He, the (5,5) CNT embodies a solid-state analog of the superfluid, thereby enabling straightforward transfer of Landau’s criterion of superfluidity. As a result, Landau’s equations acquire broader generality, and may be applicable to other nanoscale friction phenomena, whose description has been so far purely classical.
Keywords: Frictionless; Superflow; Carbon nanotubes; Generalized superfluidity; Helium