Fluctuations analysis of spin susceptibility: Neel ordering revisited in dynamical mean field theory

被引：12

作者：

Del Re, Lorenzo ^{[1
]}

Rohringer, Georg ^{[2
,3
]}

机构：

[1] Georgetown Univ, Dept Phys, 37th & O Sts, Washington, DC 20057 USA

[2] Univ Hamburg, Inst Theoret Phys, D-20355 Hamburg, Germany

[3] Russian Quantum Ctr, Skolkovo IC,Bolshoy Bulvar 30,Bld 1, Moscow 121205, Russia

来源：

PHYSICAL REVIEW B | 2021年 / 104卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.104.235128

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, we revisit the antiferromagnetic (AF) phase diagram of the single-band three-dimensional halffilled Hubbard model on a simple cubic lattice studied within the dynamical mean field theory (DMFT). Although this problem has been investigated extensively in the literature, a comprehensive understanding of the impact of the different one- and, in particular, two-particle local correlation functions of DMFT on the AF transition temperature is still missing. We have, hence, performed a fluctuation analysis of TN with respect to different local bosonic fluctuations (charge, spin, particle-particle) contained in the two-particle vertex of DMFT. Our results indicate that, beyond weak coupling, the screening of the DMFT vertex by local fluctuations leads to an enhancement of TN with respect to a random phase approximation (RPA) like calculation where this vertex is replaced by the bare interaction. The overall suppression of TN in DMFT with respect to RPA is then solely due to the incoherence introduced by the DMFT self-energy in the one-particle Green's functions. This illustrates the Janus-faced role of the local moment formation in the DMFT solution of the Hubbard model, which leads to completely opposite effects in the one- and two-particle correlation functions.

引用

页数：14

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