Progress on Levitating a Sphere in Cryogenic Fluids

Arrayás, Manuel; Bettsworth, F.; Haley, R. P.; Schanen, R.; Trueba, José L.; Uriarte, Carlos; Zavjalov, V. V.; Zmeev, D. E.

doi:10.1007/s10909-022-02925-3

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…Our results imply that devising suitable nanoprobes that fit within the two-dimensional superfluid should tap into long-range quasiparticle transport that can be studied in varying topological configurations, such as across different bulk superfluid phases and interfaces, via controlled confinement provided by engineered nanostructures 33,[35][36][37][38][39][40][41] , or across the free surface [42][43][44][45][46][47] . It may also be possible to access these phenomena by engineering the topology of the mechanical probes 48,49 . Finally, the surface layer is also expected to host Majorana zero modes 7,[50][51][52][53] that detailed transport measurements may reveal.…”

Section: Discussionmentioning

confidence: 99%

Transport of bound quasiparticle states in a two-dimensional boundary superfluid

Autti,

Haley,

Jennings

et al. 2023

Nat Commun

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The B phase of superfluid 3He can be cooled into the pure superfluid regime, where the thermal quasiparticle density is negligible. The bulk superfluid is surrounded by a quantum well at the boundaries of the container, confining a sea of quasiparticles with energies below that of those in the bulk. We can create a non-equilibrium distribution of these states within the quantum well and observe the dynamics of their motion indirectly. Here we show that the induced quasiparticle currents flow diffusively in the two-dimensional system. Combining this with a direct measurement of energy conservation, we conclude that the bulk superfluid 3He is effectively surrounded by an independent two-dimensional superfluid, which is isolated from the bulk superfluid but which readily interacts with mechanical probes. Our work shows that this two-dimensional quantum condensate and the dynamics of the surface bound states are experimentally accessible, opening the possibility of engineering two-dimensional quantum condensates of arbitrary topology.

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