QFS 2016 Book of Abstracts

Abstracts

P3.32 Cavitation bubbles in liquid 4 He close to the λ -transition Duda Daniel, ˇSvanˇcara Patrik, La Mantia Marco, Rotter Miloˇs, Schmoranzer David, Skrbek Ladislav Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic We report direct optical observation of cavitation bubbles in liquid helium, both in classical viscous He I and in superfluid He II close to the λ -transition. Heterogenous cavitation occurs due to the fast flowing liquid past the oscillating body – a quartz tuning fork of resonant frequency of 4 kHz. A cluster of small bubbles is observed and it changes rapidly size and position with time. At first look, there is no difference between He I and He II, but a few differences were observed: i) achieving cavitation is easier in He I; ii) the bubbles can last longer than one camera frame in He I. We acknowledge the support of Charles University Grant Agency under grant GAUK 1968214. P3.33 Emergence of Non-Axisymmetric Vortex in Chiral P-Wave Superconductor Kurosawa Noriyuki, Kato Yusuke The University of Tokyo, Graduate School of Arts and Sciences, Department of Basic Science, Komaba 3-8-1, Meguro Tokyo 153-8902, Japan We study strong-coupling effect upon an isolated vortex in the two-dimensional chiral p-wave superconductor. We solved the Eilenberger equation for the quasiclassical Green’s functions and the ´Eliashberg equation with single mode Einstein boson self-consistently. We calculate the free-energy of the obtained vortices, and found that there is a non-axisymmetric vortex, which is possibly more stable than the axisymmetric circular vortex.

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