Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: Nanotubes and Nanoribbons
TT 26.4: Vortrag
Dienstag, 19. März 2024, 10:15–10:30, H 3007
Superfluidity without superfluid: frictionless He-transport through a carbon nanotube — •Alberto Ambrosetti, Pier Luigi Silvestrelli, and Luca Salasnich — Università degli Studi di Padova (Italy)
In a conventional superfluid, such as 4He or dilute atomic-gases at very low temperatures, a mesoscopic particle can freely move, experiencing no friction. According to Landau’s superfluidity criterion, the quasi-linear collective excitation spectrum of the superfluid forbids quantum scattering between the superfluid and the moving mesoscopic particle, below a critical velocity. Here we predict frictionless-motion also in the absence of conventional superfluids, namely when a He atom flows inside a narrow carbon nanotube (CNT). Due to the quasi-linear spectrum of its collective plasmon and phonon modes, the CNT represents a solid analog of the superfluid medium, and admits extension of Landau’s criterion of superfluidity. The superfluidity mechanism accordingly acquires broader generality, and is shown to persist up to much higher temperatures.
Keywords: Generalized superfluidity; Nanotubes; frictionless flow; Helium; Solid