Structure and energetics of helium films on alkali substrates
Low-temperature adsorption of 4He films on Alkali metal substrates is investigated theoretically by means of ground-state quantum Monte Carlo simulations. The most accurate potentials currently available are utilized to model the interaction of 4He atoms with the substrate. Continuous growth of film...
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2004
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v70_n2_p024512_Boninsegni http://hdl.handle.net/20.500.12110/paper_01631829_v70_n2_p024512_Boninsegni |
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Sumario: | Low-temperature adsorption of 4He films on Alkali metal substrates is investigated theoretically by means of ground-state quantum Monte Carlo simulations. The most accurate potentials currently available are utilized to model the interaction of 4He atoms with the substrate. Continuous growth of film thickness as a function of chemical potential is observed on Li, Na, and K substrates. A superfluid monolayer forms on a Li substrate; on Na and K, thermodynamically stable films are a few layers thick. The uncertainties of the calculation and in the potentials, preclude a definitive conclusion on the existence of a stable 4He film on Rb. A comparison of the results of this calculation with those obtained using the Orsay-Trento density functional shows broad quantitative agreement. |
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