Theory of a Competitive Spin Liquid State for Weak Mott Insulators on the Triangular Lattice

被引：84

作者：

Mishmash, Ryan V. ^{[1
]}

Garrison, James R. ^{[1
]}

Bieri, Samuel ^{[2
]}

Xu, Cenke ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 15期

基金：

美国国家科学基金会;

关键词：

HEISENBERG-ANTIFERROMAGNET; WAVE-FUNCTIONS; ORDER; SUPERCONDUCTIVITY; PHYSICS; MODEL;

D O I：

10.1103/PhysRevLett.111.157203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose a novel quantum spin liquid state that can explain many of the intriguing experimental properties of the low-temperature phase of the organic spin liquid candidate materials kappa-(BEDT-TTF)(2)Cu-2(CN)(3) and EtMe3Sb[Pd(dmit)(2)](2). This state of paired fermionic spinons preserves all symmetries of the system, and it has a gapless excitation spectrum with quadratic bands that touch at momentum (k) over right arrow = 0. This quadratic band touching is protected by symmetries. Using variational Monte Carlo techniques, we show that this state has highly competitive energy in the triangular lattice Heisenberg model supplemented with a realistically large ring-exchange term.

引用

页数：5

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