QFS2016 Book of Abstracts

Abstracts

P3.22 Spin-density fluctuations and exchange in normal-liquid 3 He Krotscheck E.(1, 2), Lichtenegger T.(1, 2, 3) (1) Department of Physics, University at Buffalo, SUNY Buffalo NY 14260, USA (2) Institute for Theoretical Physics, Johannes Kepler University, A4040 Linz, Austria (3) Department of Particulate Flow Modelling, Johannes Kepler University, A4040 Linz, Austria We investigate the dynamics of spin- and density waves of a strongly-correlated, normal-liquid fermions at absolute zero in two and three dimensions and compare our results with neutron scattering measurements of the dynamic structure function in liquid 3 He. We calculate both the density- and the spin-density response function at a comparable level of accuracy. Inclusion of intermediate double-pair states turns out to be essential obtain the energy of both the density and the paramagnon mode; the resulting dynamic structure function shows excellent agreement with experiments. Institute for Metal Physics, 36 Vernadsky boulevard, Kiev 03142, Ukraine Realization of the nanoparticles rotational degrees of freedom in a melt leads to an increase in entropy and may causes spontaneous rotation of the nanoparticles. Rotation of the nanoparticles can also stabilize the phase composition of the particles and their size [1,2]. In the case of liquid He4 such particles can be formed as non-equilibrium parts of the crystalline phase (near the melting curve) or a cluster of normal component in the superfluid phase, the stability of which is supported by the spontaneous rotation of the nanoparticles. The kinetic and thermodynamic parameters of the rotonic states of the nanoparticles in a liquid helium are determined. [1 . ] A.I. Karasevskii, Phil. Mag. 95, 1717 (2015). [2 . ] A.I. Karasevskii, Metallofiz. Noveishie Tekhnol., 38, 141 (2016) (in Russian). P3.23 Roton states in liquid He4 A.I. Karasevskii

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