Boundary Tension at the Interface of Nanoscopic Helium Films on an Heterogeneous Substrate
This paper reports the first calculation of the two-dimensional interfacial profile and energetics of nanoscopically thin films of helium, on an heterogeneous planar substrate consisting of two adjoining metals. The calculations are performed in the frame of density functional theory at zero temperature, with the purpose of identifying the formation process of the interface at the boundary between the two substrates when few atomic layers are involved, to elucidate the possible relationship of the magnitude of the boundary tension with the displacement of layers between the half films, and to extract keys to organize future calculations of film coexistence at finite temperatures.
KeywordsHelium films Heterogenous substrates Interfacial tension
PACS05.30.Jp 05.70.Np 67.25.bh 67.60.gj
The author is thankful to F. Ancilotto, M. Barranco and M. Pi for interesting conversations and for many valuable computational hints, and to M. Cole for critical comments. This work was performed with partial support from Grants PIP 0546 from CONICET, UBACYT 01/K156 from University of Buenos Aires and PICT 2011/1217 from ANPCYT, Argentina.
- 7.J. W. Gibbs, The Scientific Papers of J. W. Gibbs, vol 1, p. 288, Dover, N. Y., 1961.Google Scholar
- 16.P. Lenz, C. Bechinger, C. Schäfle, P. Leiderer, R. Lipowsky, Langmuir 2001, 17 (2001)Google Scholar
- 27.M. Pi, private communication.Google Scholar