Phase structure of a surface model on dynamically triangulated spheres with elastic skeletons

Details Phase structure of a surface model on dynamically triangulated spheres with elastic skeletons Phase structure of a surface model on dynamically triangulated spheres with elastic skeletons

2007-04-04

arxiv.org/abs/0704.0493v1

Phys. Rev. E75, 051115 (2007)

Physics

Condensed Matter

Statistical Mechanics

9 pages with 10 figures

Scientific paper

10.1103/PhysRevE.75.051115

We find three distinct phases; a tubular phase, a planar phase, and the spherical phase, in a triangulated fluid surface model. It is also found that these phases are separated by discontinuous transitions. The fluid surface model is investigated within the framework of the conventional curvature model by using the canonical Monte Carlo simulations with dynamical triangulations. The mechanical strength of the surface is given only by skeletons, and no two-dimensional bending energy is assumed in the Hamiltonian. The skeletons are composed of elastic linear-chains and rigid junctions and form a compartmentalized structure on the surface, and for this reason the vertices of triangles can diffuse freely only inside the compartments. As a consequence, an inhomogeneous structure is introduced in the model; the surface strength inside the compartments is different from the surface strength on the compartments. However, the rotational symmetry is not influenced by the elastic skeletons; there is no specific direction on the surface. In addition to the three phases mentioned above, a collapsed phase is expected to exist in the low bending rigidity regime that was not studied here. The inhomogeneous structure and the fluidity of vertices are considered to be the origin of such variety of phases.

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