Unconventional Fermi Surface Instabilities in the Kagome Hubbard Model

被引：389

作者：

Kiesel, Maximilian L. ^{[1
]}

Platt, Christian ^{[1
]}

Thomale, Ronny ^{[1
,2
]}

机构：

[1] Univ Wurzburg, Inst Theoret Phys, D-97074 Wurzburg, Germany

[2] Ecole Polytech Fed Lausanne, Inst Theorie Phenomenes Phys, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 12期

关键词：

Hubbard model;

D O I：

10.1103/PhysRevLett.110.126405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the competing Fermi surface instabilities in the kagome tight-binding model. Specifically, we consider on-site and short-range Hubbard interactions in the vicinity of van Hove filling of the dispersive kagome bands where the fermiology promotes the joint effect of enlarged density of states and nesting. The sublattice interference mechanism devised by Kiesel and Thomale [Phys. Rev. B 86, 121105 (2012)] allows us to explain the intricate interplay between ferromagnetic fluctuations and other ordering tendencies. On the basis of the functional renormalization group used to obtain an adequate low-energy theory description, we discover finite angular momentum spin and charge density wave order, a twofold degenerate d-wave Pomeranchuk instability, and f-wave superconductivity away from van Hove filling. Together, this makes the kagome Hubbard model the prototypical scenario for several unconventional Fermi surface instabilities. DOI: 10.1103/PhysRevLett.110.126405

引用

页数：5

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