Europhys. Lett.
Volume 61, Number 6, March 2003
Page(s) 776 - 782
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 March 2003
DOI: 10.1209/epl/i2003-00301-2
Europhys. Lett., 61 (6) , pp. 776-782 (2003)

Anomalous elasticity of nematic elastomers

O. Stenull and T. C. Lubensky

Department of Physics and Astronomy, University of Pennsylvania Philadelphia, PA 19104, USA

(Received 11 December 2002; accepted 15 January 2003)

We study the anomalous elasticity of nematic elastomers by employing the powers of renormalized field theory. Using general arguments of symmetry and relevance, we introduce a minimal Landau-Ginzburg-Wilson elastic energy for nematic elastomers. Performing a diagrammatic low-temperature expansion, we analyze the fluctuations of the displacement fields at and below the upper critical dimension 3. Our analysis reveals an anomaly of certain elastic moduli in the sense that they depend on the length scale. In d = 3 this dependence is logarithmic and below d=3 it is of power law type with anomalous scaling exponents. One of the 4 relevant shear moduli vanishes at long length scales whereas the only relevant bending modulus diverges.

61.41.+e - Polymers, elastomers, and plastics.
64.60.Fr - Equilibrium properties near critical points, critical exponents.
64.60.Ak - Renormalization-group, fractal, and percolation studies of phase transitions.

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