1. Spin-polarized hydrogen adsorbed on the surface of superfluid 4He.
- Author
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Marín, J. M., Markic, L. Vranjesˇ, and Boronat, J.
- Subjects
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PHYSICS research , *SPIN polarization , *ADSORPTION (Chemistry) , *HYDROGEN , *MONTE Carlo method , *STATISTICAL physics , *COMPOSITE membranes (Chemistry) , *SUPERFLUIDITY - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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