Layering transition in helium films adsorbed on a carbon nanotube

Abstract : The study of 2D helium films has led to several breakthrough in condensed matter physics including the study of third sound and topological phase transitions, the latter being rewarded by the 2016 Nobel Prize. In most experimental studies helium was adsorbed on large scale substrates, such as mm2 scale grafoil plates or Mylar. Recent advances in the field of optomechanics and nanomechanics now opens up the possibility to study fluids [1] and superfluids [2] of smaller dimensions. In this talk, I will present our recent experiments on helium films probed through the mechanical vibrations of a carbon nanotube [3]. We observed a strong discontinuity in the adsorption of He on the nanotube surface, that we attributed to a layering transition. In addition, the low-temperature dependence of the mechanical mode of the nanotube exhibit a mode softening. Thanks to the tunability of the nanotube resonator, we confirmed the spring nature of this effect and drawn a link with the propagation of third sound in He 2D films.
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Contributor : L2c Aigle <>
Submitted on : Thursday, November 7, 2019 - 5:27:15 PM
Last modification on : Friday, November 22, 2019 - 11:04:02 AM

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  • HAL Id : hal-02354487, version 1

Citation

Adrien Noury, J. Vergara-Cruz, Pascal Morfin, Bernard Plaçais, M. C. Gordillo Bargueno, et al.. Layering transition in helium films adsorbed on a carbon nanotube. GDR MecaQ 2019, Oct 2019, Palaiseau, France. ⟨hal-02354487⟩

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