Elasticity and response in nearly isostatic periodic lattices

Abstract

The square and kagome lattices with nearest-neighbor springs of spring constant k are isostatic with a number of zero-frequency modes that scale with their perimeter. We analytically study the approach to this isostatic limit as the spring constant k′ for next-nearest-neighbor bonds vanishes. We identify a characteristic frequency ω*∼k′ and length l*∼k/k′ for both lattices. The shear modulus C44=k′ of the square lattice vanishes with k′, but that for the kagome lattice does not. © 2009 The American Physical Society.

Publication
Physical Review Letters
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Anton Souslov
Assistant Professor

I am interested in the theory of soft materials.