Quantum Monte Carlo Evidence for d-wave Pairing in the 2D Hubbard Model at a van Hove Singularity
Quantum Monte Carlo Evidence for d-wave Pairing in the 2D Hubbard Model at a van Hove Singularity
We implement a Quantum Monte Carlo calculation for a repulsive Hubbard model with nearest and next-nearest neighbor hopping interactions on clusters up to 12x12. A parameter region where the Fermi level lies close to the van Hove singularity at the Saddle Points in the bulk band structure is investigated. A pairing tendency in the $d_{x^2-y^2}$ symmetry channel, but no other channel, is found. Estimates of the effective pairing interaction show that it is close to the value required for a 40 K superconductor. Finite-size scaling compares with the attractive Hubbard model.
H. G. Matuttis、T. Husslein、D. M. Newns、I. Morgenstern、J. M. Singer、P. C. Pattnaik
Fakultaet Physik, Universitaet Regensburg, GermanyIBM Thomas J. Watson Research Center,Yorktown HeightsIBM Thomas J. Watson Research Center,Yorktown HeightsIBM Thomas J. Watson Research Center,Yorktown HeightsFakultaet Physik, Universitaet Regensburg, GermanyIBM Thomas J. Watson Research Center,Yorktown Heights
物理学
H. G. Matuttis,T. Husslein,D. M. Newns,I. Morgenstern,J. M. Singer,P. C. Pattnaik.Quantum Monte Carlo Evidence for d-wave Pairing in the 2D Hubbard Model at a van Hove Singularity[EB/OL].(1996-08-07)[2025-08-02].https://arxiv.org/abs/cond-mat/9608030.点此复制
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