螺旋高阶拓扑绝缘体中的 RKKY 相互作用

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Chinese Physics B Pub Date : 2024-04-16 DOI:10.1088/1674-1056/ad3ef9

Sha Jin, Jian Li, Qing-Xu Li, Jia-Ji Zhu

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引用次数: 0

摘要

我们从理论上研究了螺旋高阶拓扑绝缘体（HOTIs）中的 RKKY 相互作用，揭示了由铰链和狄拉克型体载流子介导的不同行为。我们的研究结果表明，铰链介导的相互作用由海森堡项、伊辛项和迪拉洛辛基-莫里亚项组成，表现出随杂质间距 $z$ 衰减和随费米能 $\varepsilon_F$ 振荡。这些相互作用表现出海森堡项和伊辛项的铁磁行为以及 DM 项的交替行为。相比之下，体介导的相互作用包括海森堡项、扭曲伊辛项和 DM 项，并具有传统的立方振荡衰变。这项研究凸显了 HOTIs 中铰链和块体 RKKY 相互作用之间微妙的相互作用，为设计基于 HOTIs 的下一代量子器件提供了启示。

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RKKY interaction in helical higher-order topological insulators

We theoretically investigate the RKKY interaction in helical higher-order topological insulators (HOTIs), revealing distinct behaviors mediated by hinge and Dirac-type bulk carriers. Our findings show that hinge-mediated interactions consist of Heisenberg, Ising, and Dzyaloshinskii-Moriya (DM) terms, exhibiting a decay with impurity spacing $z$ and oscillations with Fermi energy $\varepsilon_F$. These interactions demonstrate ferromagnetic behaviors for the Heisenberg and Ising terms and alternating behavior for the DM term. In contrast, bulk-mediated interactions include Heisenberg, twisted Ising, and DM terms, with a conventional cubic oscillating decay. This study highlights the nuanced interplay between hinge and bulk RKKY interactions in HOTIs, offering insights into the design of next-generation quantum devices based on the HOTIs.

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来源期刊

Chinese Physics B 物理-物理：综合

CiteScore

2.80

自引率

23.50%

发文量

15667

审稿时长

2.4 months

期刊介绍： Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics worldwide (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C). It publishes original research papers and rapid communications reflecting creative and innovative achievements across the field of physics, as well as review articles covering important accomplishments in the frontiers of physics. Subject coverage includes: Condensed matter physics and the physics of materials Atomic, molecular and optical physics Statistical, nonlinear and soft matter physics Plasma physics Interdisciplinary physics.