Antiferromagnetic Excitonic Insulator

IF 1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
V. V. Val’kov
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引用次数: 0

Abstract

The effective the two-band Hamiltonian is obtained for iridium oxides with account for strong electron correlations (SEC) and the spin–orbit interaction. The intraatomic electron correlations in iridium ions induce the formation of Hubbard fermions (HF) filling the states in the valence band. Another consequence of SEC is associated with the emergence of the antiferromagnetic (AFM) exchange interaction between HF in accordance with the Anderson mechanism. As a result, a long-range antiferromagnetic order is established in the system, and in the conditions of band overlapping, the intersite Coulomb interaction induces a phase transition to the excitonic insulator (EI) state with a long-range AFM order. The system of integral self-consistent equations, the solution to which determines the excitonic order parameter components Δi,j(k), sublattice magnetization M, Hubbard fermion concentration nd, and chemical potential μ, is obtained using the atomic representation, the method of two-time temperature Green’s functions, and the Zwanzig–Mori projection technique. The symmetry classification of AFM EI phases is performed, and it is shown that in the nearest neighbor approximation, state Δi, j(k) with the s-type symmetry corresponds to the ground state, while the phases with the d- and p-symmetries are metastable.

Abstract Image

反铁磁励磁绝缘体
摘要 在考虑强电子关联(SEC)和自旋轨道相互作用的情况下,得到了铱氧化物的有效两带哈密顿。铱离子中的原子内电子相关诱导形成了填充价带状态的哈伯德费米子(HF)。根据安德森机制,SEC 的另一个结果与 HF 之间出现的反铁磁(AFM)交换相互作用有关。因此,在系统中建立了长程反铁磁阶,在能带重叠的条件下,场内库仑相互作用诱导了向具有长程 AFM 阶的激子绝缘体(EI)态的相变。利用原子表示法、双时间温度格林函数法和 Zwanzig-Mori 投影技术,得到了积分自洽方程组,该方程组的解决定了激子阶参数分量 Δi、j(k)、亚晶格磁化 M、哈伯德费米子浓度 nd 和化学势 μ。对 AFM EI 相进行了对称性分类,结果表明,在近邻近似中,具有 s 型对称性的态Δi, j(k)对应于基态,而具有 d 型和 p 型对称性的相则是可转移的。
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来源期刊
CiteScore
1.90
自引率
9.10%
发文量
130
审稿时长
3-6 weeks
期刊介绍: Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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