Kitaev-Heisenberg Model on a Honeycomb Lattice: Possible Exotic Phases in Iridium Oxides A2IrO3

被引：918

作者：

Chaloupka, Jiri ^{[1
,2
]}

Jackeli, George ^{[2
,3
]}

Khaliullin, Giniyat ^{[2
]}

机构：

[1] Masaryk Univ, Dept Condensed Matter Phys, Kotlarska 2, CS-61137 Brno, Czech Republic

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[3] Andronikashvili Inst Phys, GE-0177 Tbilisi, Georgia

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 02期

关键词：

STATE;

D O I：

10.1103/PhysRevLett.105.027204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We derive and study a spin one-half Hamiltonian on a honeycomb lattice describing the exchange interactions between Ir4+ ions in a family of layered iridates A(2)IrO(3) (A = Li; Na). Depending on the microscopic parameters, the Hamiltonian interpolates between the Heisenberg and exactly solvable Kitaev models. Exact diagonalization and a complementary spin-wave analysis reveal the presence of an extended spin-liquid phase near the Kitaev limit and a conventional Neel state close to the Heisenberg limit. The two phases are separated by an unusual stripy antiferromagnetic state, which is the exact ground state of the model at the midpoint between two limits.

引用

页数：4

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