COM framework for d-wave superconductivity in the 2D Hubbard model

被引：6

作者：

Avella, Adolfo ^{[1
,2
]}

Mancini, Ferdinando ^{[1
]}

Plekhanov, Evgeny ^{[1
]}

机构：

[1] Univ Salerno, Dipartimento Fis ER Caianiello, Unita CNISM Salerno, I-84084 Fisciano, SA, Italy

[2] UOS Salerno, SPIN CNR, Fisciano, SA, Italy

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2010年 / 470卷

关键词：

Hubbard model; High-temperature cuprate superconductors; Composite operator method;

D O I：

10.1016/j.physc.2010.02.087

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The two-dimensional Hubbard model has been studied within the Composite Operator Method (COM) [1] starting from a basis made of the two Hubbard composite fields in the Nambu representation and computing the residual self-energy in the non-crossing approximation (NCA) [2]. The charge-charge, spin-spin and pair-pair susceptibilities, involved in the calculation of the self-energy within NCA in the paramagnetic phase, has been computed in the two-pole approximation [1]. The analysis of the d-wave superconducting solution additionally requires the calculation of the charge-pair susceptibility. Therefore, we decided to enlarge the bosonic basis and consider a four-component composite bosonic field to be studied within a four-pole approximation. We here report, in some detail, the quite complex calculation framework and the charge-pair susceptibility in the one-loop approximation. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：S930 / S931

页数：2

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