## 抄録

Motivated by recent experiments on Sr_{2}IrO_{4}, we study the ground state properties of a two-dimensional three-band Hubbard model with a strong relativistic spin-orbit coupling. Using the exact diagonalization technique, the dynamical magnetic structure factor M(q, ω) is calculated to examine the low-energy magnetic excitations. We find that the low-energy excitations in M(q, ω) are well described by an effective Heisenberg model composed of a local Kramers doublet of an effective total angular momentum J_{eff} | - | = 1/2. The antiferromagnetic exchange interaction estimated from M(q, ω) is as large as ∼ 80 meV, which is in good quantitative agreement with experiments. To study a possible long-range ordered state in the thermodynamic limit, we use the variational cluster approximation based on the self-energy functional theory, which is parallelized to accelerate the calculations. We find the ground state where the local Kramers doublet is in-plane antiferromagnetic ally ordered.

本文言語 | English |
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論文番号 | 012068 |

ジャーナル | Journal of Physics: Conference Series |

巻 | 454 |

号 | 1 |

DOI | |

出版ステータス | Published - 2013 |

外部発表 | はい |

## ASJC Scopus subject areas

- 物理学および天文学（全般）

## フィンガープリント

「Theoretical studies of a three-band Hubbard model with a strong spin-orbit coupling for 5d transition metal oxide Sr_{2}IrO

_{4}」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。