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New insights into helium superfluidity and thermal transport in 2D 
Monday, 07 May 2018, 12:00
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Prof. Adrian Bachtold - ICFO, BIST, Barcelona

New insights into helium superfluidity and thermal transport in 2D

Short abstract:

Mechanical resonators based on carbon nanotubes, graphene, and semiconductor monolayers are truly exceptional sensors of mass and force. We are taking advantage of these sensing capabilities to study physical phenomena in extreme regimes that have not been explored thus far, because conventional measurement methods lack sensitivity.


In a first experiment, we demonstrate the formation of superfluid helium monolayers and multilayers on a carbon nanotube. We observe layer-by-layer growth with discontinuities in both the number of adsorbed atoms and the velocity of the third sound, pointing to the hitherto unobserved layering first-order phase transition.


In a second experiment, I will discuss a novel approach to measure the thermal properties of low-dimensional materials in an unprecedented way, down to cryogenics temperature, and with a device that is simple to fabricate. We measure the temperature dependence of the thermal conductivity and the specific heat capacity of a transition metal dichalcogenide (TMD) monolayer, something that has never been achieved thus far with a single nanoscale object.

Location ICN2 Seminar Room
Contact This email address is being protected from spambots. You need JavaScript enabled to view it.
http://icn2.cat/en/events/eventdetail/776/new-insights-into-helium-superfluidity-and-thermal-transport-in-2d

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