Superconductivity and Band Topology in Functionalized 2D Hexagonal MBenes

Mohammad Keivanloo; Shashi B. Mishra; Amirreza Shariatmanesh; Mohammad Sandoghchi; Kenta Hongo; Ryo Maezono; Elena R. Margine; Mohammad Khazaei

paper

Superconductivity and Band Topology in Functionalized 2D Hexagonal MBenes

arXiv:2609.29110

Abstract

Recently, two-dimensional transition-metal borides (MBenes) have attracted substantial interest due to their promising properties for electrocatalytic applications. Here, we explore their potential as novel two-dimensional superconductors and topological materials through first-principles calculations on both pristine and surface-functionalized hexagonal MBenes. We conduct a thorough examination of the structural, electronic, phononic, superconducting, and topological properties of 36 compounds with formulas M $_{2}$ B $_{2}$ and M $_{2}$ B $_{2}$ T $_{2}$ (M = Sc, Ti, V, Zr, Nb, Hf, Ta, Mo, W; T = F, O, OH). Our analysis identifies 21 superconducting MBenes, including four with critical temperatures (T $_{c}$ ) exceeding 10 K, with Ti $_{2}$ B $_{2}$ O $_{2}$ exhibiting the highest predicted T $_{c}$ of 24 K based on the McMillan formalism. For the two most promising compounds, Ti $_{2}$ B $_{2}$ O $_{2}$ and V $_{2}$ B $_{2}$ (OH) $_{2}$ , we further solve the anisotropic Migdal-Eliashberg equations, obtaining zero-temperature superconducting gaps of 6.1 and 3.6 meV and anisotropic T $_{c}$ values of approximately 32 and 25 K, respectively. Symmetry-indicator-based analysis further reveals nontrivial normal-state band topology in several superconducting MBenes. These results indicate the coexistence of phonon-mediated superconductivity and nontrivial normal-state band topology within this material family, making MBenes promising platforms for future investigations of the possible emergence of topological superconductivity.