Numerical study on the occurrence of superconductivity in the two-chain hubbard model

摘要

We have investigated the possibility of occurrence of superconductivity in various types of the two-chain Hubbard model using numerical methods. This report consists of three parts. Firstly, using the variational Monte Carlo method we obtain a finite value of the energy gain in the superconductivity state in the bulk limit by the finite size scaling in the two-chain Hubbard model for a suitableset of material parameter values. This means that the occurrence of superconductivity is not an artificat of finite- size numerical calculations.