Topological Invariants of Möbius-Like Graphenic Nanostructures

Putz, Mihai V.; Corato, Marzio De; Benedek, G.; Sedlar, Jelena; Graovac, Ante; Ori, Ottorino

doi:10.1007/978-94-007-6413-2_7

Cited by 2 publications

(1 citation statement)

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“…All the remaining nodes on the surface of the KB have eccentricities equal to M -1, suggesting the existence of a general topological effect that we call eccentricity shrinkage, Equation (4b). Eccentricity shrinkage is a topological phenomenon that has been previously reported [23] for Möbius 1D graphenic (open) strips and has the overall topological effect of making KB L M ,L C topologically more compact then T L M ,L C when L C < L M − 1. For the polyhexes in Figure 3, the Wiener index of Equation (2) computed values W(KB) = 4504 and W(T) = 4704 confirm that KB 6,2 possesses an augmented compactness over T 6,2 , that is, W(KB) < W(T).…”

Section: Method: Topological Invariants For Polyhex Graphsmentioning

confidence: 70%

Topological Symmetry Transition between Toroidal and Klein Bottle Graphenic Systems

Putz

Ori²

2020

Symmetry

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In the current study, distance-based topological invariants, namely the Wiener number and the topological roundness index, were computed for graphenic tori and Klein bottles (named toroidal and Klein bottle fullerenes or polyhexes in the pre-graphene literature) described as closed graphs with N vertices and 3N/2 edges, with N depending on the variable length of the cylindrical edge LC of these nano-structures, which have a constant length LM of the Möbius zigzag edge. The presented results show that Klein bottle cubic graphs are topologically indistinguishable from toroidal lattices with the same size (N, LC, LM) over a certain threshold size LC. Both nano-structures share the same values of the topological indices that measure graph compactness and roundness, two key topological properties that largely influence lattice stability. Moreover, this newly conjectured topological similarity between the two kinds of graphs transfers the translation invariance typical of the graphenic tori to the Klein bottle polyhexes with size LC ≥ LC, making these graphs vertex transitive. This means that a traveler jumping on the nodes of these Klein bottle fullerenes is no longer able to distinguish among them by only measuring the chemical distances. This size-induced symmetry transition for Klein bottle cubic graphs represents a relevant topological effect influencing the electronic properties and the theoretical chemical stability of these two families of graphenic nano-systems. The present finding, nonetheless, provides an original argument, with potential future applications, that physical unification theory is possible, starting surprisingly from the nano-chemical topological graphenic space; thus, speculative hypotheses may be drawn, particularly relating to the computational topological unification (that is, complexification) of the quantum many-worlds picture (according to Everett’s theory) with the space-curvature sphericity/roundness of general relativity, as is also currently advocated by Wolfram’s language unification of matter-physical phenomenology.

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Section: Method: Topological Invariants For Polyhex Graphsmentioning

confidence: 70%