<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>s</mml:mi> <mml:mo>±</mml:mo> </mml:msub> </mml:math> -wave superconductivity in the bilayer two-orbital Hubbard model

Abstract

This study explores superconductivity in a bilayer, two-orbital Hubbard model inspired by the nickelate superconductor ${\mathrm{La}}_{3}\phantom{\rule{0}{0ex}}{\mathrm{Ni}}_{2}\phantom{\rule{0}{0ex}}{\mathrm{O}}_{7}$. Using cluster dynamical mean-field theory, the authors examine how the ${s}^{\ifmmode\pm\else\textpm\fi{}}$-wave superconducting ${T}_{c}$ depends on the hopping ${t}_{\ensuremath{\perp}}$ between interlayer ${d}_{{z}^{2}}$ orbitals and the hybridization $V$ between intralayer ${d}_{{z}^{2}}$ and ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ orbitals.The findings support a theory of ``two-component'' superconductivity, highlighting distinct roles played by the two ${e}_{g}$ orbitals in the pairing mechanism.

Topics & Concepts