Critical behavior at the interface between two systems belonging to different universality classes

Details Critical behavior at the interface between two systems belonging to different universality classes Critical behavior at the interface between two systems belonging to different universality classes

2006-01-13

arxiv.org/abs/cond-mat/0601282v2

Phys. Rev. B 73 (2006) 144419

Physics

Condensed Matter

Statistical Mechanics

16 pages, 9 figures, published version, minor changes, some references added

Scientific paper

10.1103/PhysRevB.73.144419

We consider the critical behavior at an interface which separates two semi-infinite subsystems belonging to different universality classes, thus having different set of critical exponents, but having a common transition temperature. We solve this problem analytically in the frame of mean-field theory, which is then generalized using phenomenological scaling considerations. A large variety of interface critical behavior is obtained which is checked numerically on the example of two-dimensional q-state Potts models with q=2 to 4. Weak interface couplings are generally irrelevant, resulting in the same critical behavior at the interface as for a free surface. With strong interface couplings, the interface remains ordered at the bulk transition temperature. More interesting is the intermediate situation, the special interface transition, when the critical behavior at the interface involves new critical exponents, which however can be expressed in terms of the bulk and surface exponents of the two subsystems. We discuss also the smooth or discontinuous nature of the order parameter profile.

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