Journal
EUROPEAN PHYSICAL JOURNAL E
Volume 11, Issue 4, Pages 399-408Publisher
SPRINGER
DOI: 10.1140/epje/i2003-10049-y
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We study the elastic properties of a two-dimensional fluctuating surface whose area density is allowed to deviate from its optimal (Schulman) value. The behavior of such a surface is determined by an interplay between the area-dependent elastic energy, the curvature elasticity, and the entropy. We identify three different elastic regimes depending on the ratio A(p)/A(s) between the projected (frame) and the saturated areas. We show that thermal fluctuations modify the elastic energy of stretched surfaces (A(p)/A(s) > 1), and dominate the elastic energy of compressed surfaces (A(p)/A(s) < 1). When A(p) similar to A(s) the elastic energy is not much affected by the fluctuations; the frame area at which the surface tension vanishes becomes smaller than AS and the area elasticity modulus increases.
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