Scaling behavior of crystalline membranes: an $\epsilon$-expansion approach

Abstract

We study the scaling behavior of two-dimensional (2D) crystalline membranes in the flat phase by a renormalization group (RG) method and an $\epsilon$-expansion. Generalization of the problem to non-integer dimensions, necessary to control the $\epsilon$-expansion, is achieved by dimensional continuation of a well-known effective theory describing out-of-plane fluctuations coupled to phonon-mediated interactions via a scalar composite field, equivalent for small deformations to the local Gaussian curvature. The effective theory, which will be referred to as Gaussian curvature interaction (GCI) model, is equivalent to theories of elastic $D$-dimensional manifolds fluctuating in a $(D+d_c)$-dimensional embedding space in the physical case $D=2$ for arbitrary $d_c$. For $D\ne 2$, instead, the GCI model is not equivalent to a direct dimensional continuation of elastic membrane theory and it defines an alternative generalization to generic internal dimension $D$. We calculate explicitly RG functions at two-loop order and determine the exponent $\eta$ characterizing the long-wavelength scaling of correlation functions to order ${\epsilon }^2$ in an $\epsilon =(4-D)$-expansion. The self-consistent screening approximation (SCSA) for the GCI model is shown to be exact to O(${\epsilon }^2$). For $d_c=1$, the O(${\epsilon }^2$) correction is suppressed by a small numerical prefactor. As a result, despite the large value of $\epsilon =2$, extrapolation of the first and second order results to $D=2$ leads to very close numbers, $\eta =0.8$ and $\eta \simeq 0.795$. The calculated exponent values are close to earlier reference results obtained by non-perturbative RG, the SCSA and numerical simulations. These indications suggest that a perturbative analysis of the GCI model could provide an useful framework for accurate quantitative predictions of the scaling exponent even at $D=2$.

arXiv comment15 pages, 4 figures

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Cited by in corpus (14)

• The flat phase of polymerized membranes at two-loop order
• Scale without conformal invariance in membrane theory
• Three-loop order approach to flat polymerized membranes
• Thermal ripples in bilayer graphene
• Scale without Conformal Invariance in Dipolar Ferromagnets
• Wrinkling transition in quenched disordered membranes at two loops
• Distribution of ripples in graphene membrane
• Emergent continuous symmetry in anisotropic flexible two-dimensional materials
• Flat phase of quenched disordered membranes at three-loop order
• Disorder-driven transition to tubular phase in anisotropic two-dimensional materials
• Auxiliary fields approach to shift-symmetric theories: the ${\phi }^4$ derivative theory and the crumpled-to-flat transition of membranes at two-loop order
• Lessons from $O(N)$ models in one dimension
• Perturbative renormalization and thermodynamics of quantum crystalline membranes
• Renormalization group approach to the elastic properties of graphene bilayers