Quantitative Chemistry and the Discrete Geometry of Conformal Atom-Thin Crystals

Abstract

When flat or on a firm mechanical substrate, the atomic composition and atomistic structure of two-dimensional crystals dictate their chemical, electronic, optical, and mechanical properties. These properties change when the two-dimensional and ideal crystal structure evolves into arbitrary shapes, providing a direct and dramatic link among geometry and material properties due to the larger structural flexibility when compared to bulk three-dimensional materials. We describe methods to understand the local geometrical information of two-dimensional conformal crystals quantitatively and directly from atomic positions, even in the presence of atomistic defects. We then discuss direct relations among the discrete geometry and chemically-relevant quantities --mean-bond-lengths, hybridization angles and $\sigma -\pi$ hybridization. These concepts are illustrated for carbon-based materials and ionic crystals. The piramidalization angle turns out to be linearly proportional to the mean curvature for relevant crystalline configurations. Discrete geometry provides direct quantitative information on the potential chemistry of conformal two-dimensional crystals.

This document is the Submitted Manuscript version of a Published Work that appeared in final form in ACS Nano,copyright [2014]

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• Generalizing the Fermi velocity of strained graphene from uniform to nonuniform strain
• Tuning the ferro- to para-electric transition temperature and dipole orientation of group-IV monochalcogenide monolayers
• Strain and the optoelectronic properties of non-planar phosphorene monolayers
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