QFS 2016 Book of Abstracts

Abstracts

O2.4 Mass flow through thin solid helium samples* Shin, Jae-ho(1); Kim, DukYoung(2); Haziot, Ariel(3); Chan, M.H.W.(4) 1) Penn State University, PA USA 2) Penn State University, PA, USA; current address: Los Alamos Nat. Lab. 3) Penn State University, PA, USA; current address: Neel Insitut, France 4) Penn State University, PA, USA We will report measurements of superfluid-like mass flow through solid helium samples sandwiched between two superfluid reservoirs as used sby Hallock at the Univ.of Mass.( PRL 100, 235301, 2008). Instead of a solid sample of 4 cm as employed by Hallock, our solid samples have thicknesses of 8, 50 and 1000 microns. Our measurements show interesting differences from that found at UMass, flow rate as a function of path length, temperature and pressure will be presented. Work supported by US NSF. O2.5 WAVES ON QUANTUM SURFACES Todoshchenko Igor, Savin Alexander, Haataja Miika, Hakonen Pertti Aalto University, Department of Applied Physics, Low Temperature Laboratory, 00076 AALTO, Finland At an interface between two media, the 3D symmetry is broken which allows for the existence of exotic particles like Majorana fermions or anyons. A natural way to explore these surface excitations is to study surface resonances. In addition to usual capillary waves, helium at low temperatures supports phase waves, like waves of crystallization. By using a double resonance technique we have obtained the first evidence of the crystallization waves in 3 He at temperatures well below 0.5 mK. We also discuss the possibility of phase waves at the interface between two different superfluid phases of 3 He. This wave does not have usual material mass, and its inertia is due to spin supercurrents.

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