Correlation between Charge Inhomogeneities and Structure in Graphene and Other Electronic Crystalline Membranes

Details Correlation between Charge Inhomogeneities and Structure in Graphene and Other Electronic Crystalline Membranes Correlation between Charge Inhomogeneities and Structure in Graphene and Other Electronic Crystalline Membranes

2009-03-29

arxiv.org/abs/0903.5012v4

Phys. Rev. B 80, 161406(R) (2009)

Physics

Condensed Matter

Materials Science

Accepted for publication in PRB as Rapid Communication

Scientific paper

10.1103/PhysRevB.80.161406

Only one atom thick and not inclined to lattice defects, graphene represents the ultimate crystalline membrane. However, its structure reveals unique features not found in other crystalline membranes, in particular the existence of ripples with wavelength of 100-300 Angstroms. Here, I trace the origin of this difference to the free electrons in the membrane. The deformation energy of the lattice creates a coupling between charge fluctuations and the structure, resulting in ripples on the membrane, correlated with charge inhomogeneities. In graphene this mechanism reproduces the experimental result for both charge puddles and ripples.

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