[9a-A31-1~13] 11.1 Fundamental properties

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9a-A31-1] Theoretical study on the possibility of unconventional superconductivity in bilayer BC₃

〇(M2)Harunao Negishi¹, Ochi Masayuki^1,2, Kuroki Kazuhiko¹ (1.UOsaka, 2.FRC, UOsaka)

Keywords:

superconductivity

Theoretical studies on the bilayer Hubbard model have predicted that a superconducting transition temperature surpassing that of cuprates can be achieved when interlayer hopping exceeds in-plane hopping. Motivated by this, we focus on bilayer BC₃, a boron-substituted graphene network in which the inequivalence between boron and carbon yields narrow boron-derived bands, making it promising as a strongly correlated electron system. We first confirm through first-principles phonon calculations that the stacking reported as stable in the bulk is also dynamically stable in the bilayer. We then construct an effective Hubbard model by extracting the boron orbitals and apply the fluctuation exchange (FLEX) approximation. Finally, by solving the linearized Eliashberg equation, we reveal the potential for unconventional superconductivity in bilayer BC₃.