Freiburg 2024 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Atomic Clusters (joint session A/MO)

MO 14.2: Talk

Wednesday, March 13, 2024, 14:45–15:00, HS 1015

Self-organized supersolidity in ion doped Helium droplets — •Juan Carlos Acosta Matos, Panagiotis Giannakeas, and Jan Michael Rost — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

It is well known that crystallized shells, of Helium atoms, a so called snowball, forms around the ion in the otherwise (super-)fluid Helium droplet [1]. Here, we show that for sufficiently large droplets a third regime appears between the snowball and the liquid one with a supersolid structure where the Helium density exhibits a periodic modulation of the particle density on a spherical shell. The periodic modulation emerges due to the inner shell snowball structure that provides a lattice substrate for the outer droplet shells yielding an accumulation of superfluid particles. To identify supersolidity in a geometrically confined scenario of a droplet we combine modified density functional theory (DFT), allowing us to describe large enough droplets, with a Gaussian Imaginary Time Dependent Hartree (G-ITDH)[2] method which traces the emergence of crystallized structures. Our approach works well as a comparison to Quantum Monte Carlo results [3] for smaller droplets reveals. [1] D. E. Galli etal, J. Phys. Chem. A 2011, 115, 7300-7309 [2] W. Unn-Toc etal, J. Chem. Phys. 137, 054112 (2012) [3] M. Rastogi etal, Phys. Chem. Chem. Phys. 2018, 20, 25569

Keywords: superfluidity; supersolidity; snowballs