Strain gauge fields for rippled graphene membranes under central mechanical load: an approach beyond first-order continuum elasticity
| Autor: | Cedric M. Horvath, James V. Sloan, Alejandro A. Pacheco Sanjuan, Salvador Barraza-Lopez, Zhengfei Wang |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Mechanical load Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Lattice field theory Elastic energy FOS: Physical sciences Landau quantization Elasticity (physics) Condensed Matter Physics Electronic Optical and Magnetic Materials Strain engineering Classical mechanics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Gauge theory Strain gauge |
| Popis: | We study the electronic properties of rippled freestanding graphene membranes under central load from a sharp tip. To that end, we develop a gauge field theory on a honeycomb lattice valid beyond the continuum theory. Based on the proper phase conjugation of the tight-binding pseudospin Hamiltonian, we develop a method to determine conditions under which continuum elasticity can be used to extract gauge fields from strain. Along the way, we resolve a recent controversy on the theory of strain engineering in graphene: There are no K-point dependent gauge fields. We combine this lattice gauge field theory with atomistic calculations and find that for moderate load, the rippled graphene membranes conform to the extruding tip without significant increase of elastic energy. Mechanical strain is created on a membrane only after a certain amount of load is exerted. In addition, we find that the deformation potential --even when partially screened-- induces qualitative changes on the electronic spectra, with Landau levels giving way to equally-spaced peaks. 8 pages, 7 figures |
| Databáze: | OpenAIRE |
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