Bulk and boundary effects on the decay of the thermodynamic Casimir force
SISSA - Via Bonomea 265, 34136 Trieste, Italy and INFN Sezione di Trieste - Trieste, Italy
Received: 22 October 2014
Accepted: 15 December 2014
We consider the decay of the thermodynamic Casimir force in phases with a finite correlation length. For the case of the strip, we use properties of low-energy two-dimensional field theory to show that the decay depends on the symmetry properties of the boundary conditions, in distinctive ways that we determine exactly. Features characteristic of the bulk universality class may induce modifications that we also discuss. Symmetry-breaking and symmetry-preserving boundary conditions exchange their role with respect to the decay of the force when exchanging spontaneously broken with disordered phases. Several of our arguments extend to higher dimensions.
PACS: 64.60.an – Finite-size systems / 68.35.Rh – Phase transitions and critical phenomena / 11.10.-z – Field theory
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