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On the Kinetic Energy Driven Superconductivity in the Two-Dimensional Hubbard Model
We investigate the role of kinetic energy for the stability of superconducting state in the two-dimensional Hubbard model on the basis of an optimization variational Monte Carlo method. The wave function is optimized by multiplying by correlation operators of site off-diagonal type. This wave function is written in an exponential-type form given as ψλ=exp(−λK)ψG for the Gutzwiller wave function ψG and a kinetic operator K. The kinetic correlation operator exp(−λK) plays an important role in thedoi:10.3390/condmat6010012 fatcat:w4y4fskgxbcudei6t5g3a3h3wu