C2N/graphene bilayer, density functional theory, local pseudoatomic orbitals (PAOs), plane waves (PW), basis set superposition error (BSSE)
Abstract
We investigated the structural and energetic properties of the C2N/graphene bilayer using the electron density functional theory. We compared two approaches for wave function decomposition: plane waves (PW) and localized pseudoatomic orbitals (PAOs). We showed that for the weakly bonded bilayer, it is essential to consider correction to the basis set superposition error in binding energy calculations and geometry optimization. Otherwise, the interlayer binding energy and layer separation could be overestimated by 45–90 % and underestimated by 4–12 %, respectively. Also, to have the quantitative agreement between PAOs and PW results, the atomic-like basis set should be optimized. Overall, calculated with dispersion corrections, the interlayer binding energy (0,17–0,22 J/m2) is of the van der Waals nature.
Author Biographies
Dar'ya Vital'evna Babaylova, South Ural State University, Chelyabinsk
Undergraduate Student
Kirill Vyacheslavlovich Alantev, South Ural State University, Chelyabinsk
Undergraduate Student
Mariya Viktorovna Kaplun, South Ural State University, Chelyabinsk
Assistant, Physics of Nanoscale Systems Department
Ekaterina Vladimirovna Anikina, South Ural State University, Chelyabinsk
Cand. Sc. (Physics and Mathematics), Physics of Nanoscale Systems Department
Tatyana Yur'evna Nikonova, South Ural State University, Chelyabinsk
Assistant, Physics of Nanoscale Systems Department
