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Spin-polarized hydrogen adsorbed on the surface of superfluid He-4
Marín, J. M.; Vranješ Markic, Leandra; Boronat Medico, Jordi
Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada
The experimental realization of a thin layer of spin-polarized hydrogen H double down arrow adsorbed on top of the surface of superfluid He-4 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 He-4 slab and the adsorbed H double down arrow 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. (c) 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4843375]
Àrees temàtiques de la UPC::Física
Bose-Einstein condensation
Atomic hydrogen
Liquid helium
Quantum Systems
Gas
BOSE-EINSTEIN CONDENSATION
ATOMIC-HYDROGEN
LIQUID-HELIUM
ALIGNED HYDROGEN
QUANTUM SYSTEMS
GAS
ADSORPTION
SCATTERING
HE
Condensació de Bose-Einstein
Heli líquid
Gas
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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