arXiv subjects

Ruslan Yamaletdinov

Publications and source records attributed to Ruslan Yamaletdinov.

4 recordsLinked to original sources

arXiv2026

Breakdown of Charge-Conjugation Symmetry of Disclinations in 2D Crystals

Disclinations are elementary topological defects in two-dimensional (2D) crystalline membranes, yet their elastic properties remain largely unexplored. Using atomistic simulations, we address the energetics, morphology, and interactions of disclinations in free-standing graphene, a prototypical 2D crystal. We find that while disclinations with positive topological charges follow an expected behavior, negative disclinations exhibit sublinear energy scaling with charge as well as equilibrium shape that deviates sharply from the conventional saddle ansatz. This breakdown of charge-conjugation symmetry leads to qualitatively distinct interactions: positive disclinations repel, whereas negative disclinations display a robust long-range attraction. These trends are shown to be further amplified by self-adhesion in folded membranes. Our results uncover a fundamentally different energetic landscape for negative curvature defects and provide a basis for understanding the stability, self-folding behavior, and defect-driven morphology of graphene and other 2D membranes.

cond-mat.mes-hall↗

arXiv2025

A Predictive Theory of Electrochemical Ostwald Ripening for Electrodeposited Lithium Metal

Electrode morphology critically determines the stability and efficiency of lithium metal anodes, yet no predictive framework has explained how measurable parameters control deposition. Here we introduce the first theoretical model of electrochemical Ostwald ripening, capturing the competition between electroplating and surface-energy-driven redistribution and identifying it as the governing process behind morphology evolution in the non-dendritic regime. The framework explicitly incorporates SEI resistance, electrolyte conductivity, electrode wettability, and current density revealing the transition from 2D SEI-limited to 3D electrolyte-limited growth. The model yields analytical expressions for nucleus size, density and distribution that quantitatively reproduce independent experimental results and establishes a direct link between plating conditions, morphology, and Coulombic efficiency. By providing experimentally accessible relationships between key parameters and deposition outcomes, the framework enables predictive understanding of lithium plating and provides a broadly applicable basis for controlling electrodeposition morphology across diverse electrochemical systems.

cond-mat.mtrl-sci↗

arXiv2020

On the stability and existence of nitro-graphene, nitro-graphane, and nitro-graphene oxide

Here, the possibility of the existence of nitro-graphene derivatives with undisturbed graphene backbone is considered. Based on the first-principles calculation, it is shown that while NO$_2$ is unable to form a covalent bond with bare graphene, it becomes possible in some structures of graphane, fluorographene, and graphene oxide. This paper presents, among others, an analysis of the surrounding influence on the C-NO$_2$ bond strength. The author believes, that potential prospects of these materials and discussion about possible synthesizing routes may help further research on graphene-based materials.

cond-mat.mtrl-sci↗

arXiv2019

Ultrafast lithium diffusion in bilayer buckled graphene: A comparative study of Li and Na

The effect of the curvature of bilayer graphene on the interlayer diffusion of Li atoms is investigated using molecular dynamics simulations. A spectacular enhancement of the diffusion constant parallel to the folding axis is found. The ratio of the parallel to the perpendicular diffusion depends on the buckling direction and stacking type, and it increases with the degree of buckling. The strongest anisotropy is observed in the case of fixed zig-zag edges. A comparison with the interlayer diffusion of Na suggests that the strong asymmetry in the vibrational states of buckled graphene and also the smaller mass of Li are likely to contribute to the observed diffusion enhancement. This work opens a new pathway to develop highly-efficient anodes for rechargeable alkaline batteries.

cond-mat.mtrl-sci↗