Quantum Paramagnet in a π Flux Triangular Lattice Hubbard Model

被引：18

作者：

Rachel, Stephan ^{[1
]}

Laubach, Manuel ^{[2
]}

Reuther, Johannes ^{[3
,4
]}

Thomale, Ronny ^{[2
]}

机构：

[1] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany

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

[3] Free Univ Berlin, Dahlem Ctr Complex Quantum Syst & Fachbereich Ph, D-14195 Berlin, Germany

[4] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 16期

基金：

美国国家科学基金会;

关键词：

ENERGY-FUNCTIONAL APPROACH; NEUTRAL ATOMS; SPIN LIQUIDS; INSULATOR; PHASE; ORDER;

D O I：

10.1103/PhysRevLett.114.167201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose the pi flux triangular lattice Hubbard model (pi THM) as a prototypical setup to stabilize magnetically disordered quantum states of matter in the presence of charge fluctuations. The quantum paramagnetic domain of the pi THM that we identify for intermediate Hubbard U is framed by a Dirac semimetal for weak coupling and by 120 degrees Neel order for strong coupling. Generalizing the Klein duality from spin Hamiltonians to tight-binding models, the pi THM maps to a Hubbard model which corresponds to the (J(H); J(K)) = (-1, 2) Heisenberg-Kitaev model in its strong coupling limit. The p THM provides a promising microscopic testing ground for exotic finite-U spin liquid ground states amenable to numerical investigation.

引用

页数：5

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