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Ground-state phase diagram of the Kitaev-Heisenberg model on a kagome lattice
- Publication Year :
- 2018
-
Abstract
- The Kitaev-Heisenberg model on the honeycomb lattice has been studied for the purpose of finding exotic states such as quantum spin liquid and topological orders. On the kagome lattice, in spite of a spin-liquid ground state in the Heisenberg model, the stability of the spin-liquid state has hardly been studied in the presence of the Kitaev interaction. Therefore, we investigate the ground state of the classical and quantum spin systems of the kagome Kitaev-Heisenberg model. In the classical system, we obtain an exact phase diagram that has an eightfold degenerated canted ferromagnetic phase and a subextensive degenerated Kitaev antiferromagnetic phase. In the quantum system, using Lanczos-type exact diagonalization and cluster mean-field methods, we obtain two quantum spin-liquid phases, an eightfold degenerated canted ferromagnetic phase similar to the classical spin system, and an eightfold degenerated, $\mathbf{q}=\mathbf{0},{120}^{\ensuremath{\circ}}$ ordered phase induced by quantum fluctuation. These results may provide a crucial clue to recently observed magnetic structures of the rare-earth-based kagome lattice compounds ${A}_{2}{\mathrm{RE}}_{3}{\mathrm{Sb}}_{3}{\mathrm{O}}_{14}\phantom{\rule{4pt}{0ex}}(A=\text{Mg}$, Zn; $\text{RE}=\text{Pr}$, Nd, Gd, Tb, Dy, Ho, Er, Yb).
- Subjects :
- Physics
Condensed matter physics
Strongly Correlated Electrons (cond-mat.str-el)
Heisenberg model
FOS: Physical sciences
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Condensed Matter - Strongly Correlated Electrons
Lattice (order)
0103 physical sciences
Quantum system
Antiferromagnetism
Condensed Matter::Strongly Correlated Electrons
Quantum spin liquid
010306 general physics
0210 nano-technology
Ground state
Quantum fluctuation
Phase diagram
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a5c2d4f072b211a6a6c0fea485fbf33c