ISSN:
1434-6036
Keywords:
PACS. 05.50+q Lattice theory and statistics; Ising problems[:AND:] 05.70.Jk Critical point phenomena
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: The two-dimensional Ising films with bulk H and surface H1 fields of opposite sign are studied above and close to bulk criticality by the density matrix renormalization group method. This technique, applied recently to d=2 Ising films, allows for very accurate results for the adsorption as a function of the reduced deviation from the critical temperature .For strong H1 three distinct classes of shapes of ,determined by the value of the parameter ,where L is the width of the film, are found in agreement with earlier predictions [A. Macio ek, A. Ciach, R. Evans, J. Chem. Phys. 108, 9765 (1998)]. For strong and for weak bulk fields is a monotonic function, increasing for strong H and decreasing for weak H, in agreement with scaling analysis and earlier mean-field results. For H between these extreme cases assumes a maximum for and for a depletion occurs, as in recent experiments for critical adsorption in porous materials. For a limited range of H a qualitatively new behavior of is found. In addition to a maximum, a minimum of for appears, which in the mean-field analysis was absent.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050508
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