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arXiv 2502.00697cond-mat.str-el
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Dirac锥在铁基磷族化合物自旋密度波态相关各向异性性质中的作用

Role of Dirac cones in the anisotropic properties associated with the spin-density wave state of iron pnictides

Garima Goyal, Dheeraj Kumar Singh

AI总结:

本文利用最小双轨道模型,揭示了Dirac锥对铁基磷族化合物自旋密度波态各向异性电子性质的显著贡献,并通过光学电导、准粒子干涉及自旋波激发验证了该机制。

摘要:

铁基磷族化合物自旋密度波态中异常各向异性电子性质的起源,传统上被归因于与共线磁序相关的四重旋转对称性破缺。通过使用最小双轨道模型,我们表明各向异性的很大一部分贡献可能来自Dirac锥,这些Dirac锥距离Fermi能级不远。我们通过考察具有自旋密度波序的Dirac半金属态的光学电导和准粒子干涉来证明这一现象,后者可通过选择适当的相互作用参数和$d_{xz}$与$d_{yz}$轨道间的轨道劈裂来获得。我们进一步扩展此研究,考察了具有自旋密度波序的Dirac半金属态中的低能自旋波激发。

英文摘要:

The origin of unusual anisotropic electronic properties in the spin-density wave state of iron pnictides has conventionally been attributed to the breaking of four-fold rotational symmetry associated with the collinear magnetic order. By using a minimal two-orbital model, we show that a significant portion of the contribution to the anisotropy may come from the Dirac cones, which are not far away from the Fermi level. We demonstrate this phenomenon by examining optical conductivity and quasiparticle interference in the Dirac-semimetallic state with spin-density wave order, and the latter can be obtained by choosing appropriate interaction parameters and orbital splitting between the $d_{xz}$ and $d_{yz}$ orbitals. We further extend this study to investigate the low-energy spin-wave excitations in the Dirac-semimetallic state with spin-density wave order.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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