Kagome model for a Z2 quantum spin liquid

被引：16

作者：

Block, Matthew S. ^{[1
]}

D'Emidio, Jonathan ^{[2
]}

Kaul, Ribhu K. ^{[3
]}

机构：

[1] Calif State Univ Sacramento, Dept Phys & Astron, Sacramento, CA 95819 USA

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

[3] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA

来源：

PHYSICAL REVIEW B | 2020年 / 101卷 / 02期

关键词：

TRIANGULAR-LATTICE; GROUND-STATES; VALENCE-BOND; PHASE; ORDER; DISORDER;

D O I：

10.1103/PhysRevB.101.020402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a study of a simple model antiferromagnet consisting of a sum of nearest-neighbor SO(N) singlet projectors on the kagome lattice. Our model shares some features with the popular S = 1/2 kagome antiferromagnet but is specifically designed to be free of the sign problem of quantum Monte Carlo. In our numerical analysis, we find as a function of N a quadrupolar magnetic state and a wide range of a quantum spin liquid. A solvable large-N generalization suggests that the quantum spin liquid in our original model is a gapped Z(2) topological phase. Supporting this assertion, a numerical study of the entanglement entropy in the sign free model shows a quantized topological contribution.

引用

页数：5

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