Naslov
Spin-polarized hydrogen adsorbed on the surface of superfluid 4He

Autori
Marin, Jordi ; Vranješ Markić, Leandra ; Boronat, Jordi

Izvornik
The Journal of chemical physics (0021-9606) 139 (2014), 22; 224708, 6

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
helium ; hydrogen ; adorption ; quantum Monte Carlo ; Berezinski-Kosterlitz-Thouless transition ; gas

Sažetak
The experimental realization of a thin layer of spin-polarized hydrogen H↓ adsorbed on top of the surface of superfluid 4He provides one of the best examples of a stable, nearly two-dimensional (2D) quantum Bose gas. We report a theoretical study of this system using quantum Monte Carlo methods in the limit of zero temperature. Using the full Hamiltonian of the system, composed of a superfluid 4He slab and the adsorbed H↓ layer, we calculate the main properties of its ground state using accurate models for the pair interatomic potentials. Comparing the results for the layer with the ones obtained for a strictly 2D setup, we analyze the departure from the 2D character when the density increases. Only when the coverage is rather small the use of a purely 2D model is justified. The condensate fraction of the layer is significantly larger than in 2D at the same surface density, being as large as 60% at the largest coverage studied.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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