Enhancement of d-wave Pairing in Cuprates by Electron-phonon Couplings

The high-temperature cuprate superconductors have attracted great attentions over the past few decades. Since its discovery, the role of electron-phonon couplings in the mechanism of high-temperature superconductivity in cuprates has been intensely debated. Some believe that electron-phonon coupling may have a key impact on the d-wave superconductivity in cuprates. We study the microscopic model of electrons on the 2D square lattice with both electron-electron and electron-phonon interactions. From determinant quantum Monte Carlo simulations (DQMC), we show that d-wave pairing can be significantly enhanced when the electron-phonon coupling is increased.