双层蜂窝状海森伯铁磁体中层间交换耦合相互作用对拓扑相的影响

施洪潮; 唐炳; 刘超飞

doi:10.7498/aps.73.20240437

摘要

层状磁性拓扑材料是最小二维单元下同时具有磁序和拓扑性的材料体系, 研究这一体系可能会观察到新物性和新现象的出现, 因此引起了研究者们的广泛关注. 本文运用线性自旋波理论, 主要研究了层间铁磁耦合的双层蜂窝状海森伯铁磁体中层间交换耦合相互作用对系统拓扑相的影响. 通过计算不同层间交换耦合相互作用强度下的磁子色散关系能得出, 当系统达到两个强度临界值时, 能量较高的两条能带和能量较低的两条能带的带隙在狄拉克点处会依次出现闭合-重新打开现象. 计算能带对应的贝里曲率和陈数后, 发现贝里曲率符号在相应临界值前后会发生反转, 同时陈数也会发生改变, 这证明系统发生了拓扑相变. 此外, 本文研究发现当双层蜂窝状铁磁体发生拓扑相变时, 磁子热霍尔系数变化曲线会相应发生突变. 本研究成果可以为利用双层蜂窝状铁磁材料制作具有更高信息传输能力的自旋电子器件提供理论支撑, 也可以为其他双层铁磁系统的相关研究提供一定的理论参考.

关键词:

Abstract

Layered magnetic topological materials are material systems that exhibit both magnetic ordering and topological properties in their smallest two-dimensional units. Studying these systems may lead to the observation of new physical properties and phenomena, which has attracted considerable attention from researchers. The effect of interlayer exchange coupling interactions on bilayer honeycomb Heisenberg ferromagnets with interlayer coupled topological phase is investigated by using linear spin wave theory. The influence of introducing two additional types of interactions, i.e. interlayer exchange coupling interaction and interlayer easy-axis anisotropy interaction, on the topological phase transition are also explored in this work. By calculating the magnon dispersion relations at various interlayer exchange coupling interaction intensities, it is found that the band gaps of high energy band and low energy band both close and reopen at the Dirac points when the system reaches the critical value of interlayer exchange coupling interaction. In magnon systems, such physical phenomena typically relate to topological phase transitions. When calculating the Berry curvature and Chern numbers for the bands in the aforementioned process, it is found that the sign of the Berry curvature reverses and the Chern numbers change when the critical value of interlayer exchange coupling interaction strength is reached, confirming that a topological phase transition occurs indeed. Introducing two other types of interlayer exchange coupling interactions in this process can lead various novel topological phases to occur in the system. The enhancement of interlayer easy-axis anisotropy interactions is likely to impede the topological phase transitions occurring in the system. We find that a major distinction between bilayer honeycomb ferromagnets and their single-layer counterparts lies in the fact that during a topological phase transition, the sign of the magnon thermal Hall coefficient does not change; on the contrary, abrupt shift in the thermal Hall coefficient curve occurs which can be seen as an indicator of topological phase transition of bilayer honeycomb ferromagnets, and is also reflected in the change in magnon Nernst coefficient. The research results of this work can provide theoretical support for developing novel spintronic devices with enhanced information transmission capabilities by using bilayer honeycomb ferromagnetic materials, and can also provide theoretical reference for studing other bilayer ferromagnetic systems.

Keywords:

作者及机构信息

1.
吉首大学物理与机电工程学院, 吉首　416000

2.
江西理工大学理学院, 赣州　341000

通信作者: 唐炳, bingtangphy@jsu.edu.cn ; 刘超飞, liuchaofei@jxust.edu.cn

基金项目: 国家自然科学基金(批准号: 12064011, 12375014, 11875149)、湖南省教育厅科学研究项目 (批准号: 23A0404)和吉首大学2023年度研究生校级科研项目(批准号: Jdy23052)资助的课题.

Authors and contacts

1.
School of Physics and Mechanical & Electrical Engineering, Jishou University, Jishou 416000, China

2.
School of Science, Jiangxi University of Science and Technology, Ganzhou 341000, China

Corresponding author: Tang Bing, bingtangphy@jsu.edu.cn ; Liu Chao-Fei, liuchaofei@jxust.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 12064011, 12375014, 11875149), the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 23A0404) and the School-level Graduate Scientific Research Project Foundation of Jishou University, China (Grant No. Jdy23052).

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参考文献

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施引文献

图 1 双层蜂窝状铁磁体晶格结构　(a)侧视图; (b)俯视图; (c)晶格矢量, 最近邻矢量$ {{\boldsymbol{\delta }}_n} $和次近邻矢量$ {{\boldsymbol{\varsigma }}_n} $分别用红色和蓝色箭头表示; (d) 第一布里渊区高对称路径$ { M} {\text{-}} { K}' {\text{-}} \varGamma {\text{-}} { K} {\text{-}} { M} $

Fig. 1. Lattice structure of the bilayer honeycomb ferromagnet: (a) Side view; (b) top view; (c) the lattice vector, the nearest and next-nearest neighbor vectors, $ {{\boldsymbol{\delta }}_n} $ and $ {{\boldsymbol{\varsigma }}_n} $, are represented by red and blue arrows, respectively; (d) the high symmetric path $ { M} {\text{-}} { K}' {\text{-}} \varGamma {\text{-}} { K} {\text{-}} { M} $ in the first Brillouin zone.

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图 2 双层蜂窝状铁磁体能带结构　(a) $ {J_0} = 0.1 $; (b) $ {J_0} = 0.245 $; (c) $ {J_0} = 0.3 $; (d) $ {J_0} = 0.505 $; (e) $ {J_0} = 0.9 $, 其余参数设置为$ \varGamma '{=}0.1 $, $ {J_1} = {J_2} = 0 $; (f) 带隙图

Fig. 2. Magnon band structures of the bilayer honeycomb ferromagnet: (a) $ {J_0} = 0.1 $; (b) $ {J_0} = 0.245 $; (c) $ {J_0} = 0.3 $; (d) $ {J_0} = $$ 0.505 $; (e) $ {J_0} = 0.9 $, the other parameters are set to $ \varGamma ' = 0.1 $, $ {J_1} = {J_2} = 0 $; (f) gaps as a function of $ {J_0} $.

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图 3 双层蜂窝状铁磁体最低能带对应的贝里曲率　(a) $ {J_0} = 0.2 $; (b) $ {J_0} = 0.5 $; (c) $ {J_0} = 0.51 $; (d) $ {J_0} = 0.8 $. 双层蜂窝状铁磁体最高能带对应的贝里曲率 (e) $ {J_0} = 0.15 $; (f) $ {J_0} = 0.24 $; (g) $ {J_0} = 0.25 $; (h) $ {J_0} = 0.8 $, 其余参数设置为$ \varGamma '{=}0.1 $, $ {J_1} = {J_2} = 0 $

Fig. 3. Berry curvature of the lowest band in a bilayer honeycomb ferromagnet: (a) $ {J_0} = 0.2 $; (b) $ {J_0} = 0.5 $; (c) $ {J_0} = 0.51 $; (d) $ {J_0} = 0.8 $. Berry curvature of the highest band in a bilayer honeycomb ferromagnet: (e) $ {J_0} = 0.15 $; (f) $ {J_0} = 0.24 $; (g) $ {J_0} = $$ 0.25 $; (h) $ {J_0} = 0.8 $. Other parameters are set to $ \varGamma '{=}0.1 $ and $ {J_1} = {J_2} = 0 $.

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图 4 不同层间易轴各向异性相互作用强度下的陈数随$ {J_0} $强度变化曲线　(a)最低能带; (b)最高能带, 其余参数设置为$ \varGamma ' = 0.1, {J_1} = {J_2} = 0 $

Fig. 4. Chern number as a function of the intensity of interlayer exchange coupling interaction $ {J_0} $ for the different intensity of interlayer easy-axis anisotropy interaction: (a) The lowest band; (b) the highest band, the other parameters are set to $ \varGamma ' = 0.1, $$ {J_1} = {J_2} = 0 $.

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图 5 陈数随层间交换耦合相互作用J₀和J₁强度变化图　(a)—(d)分别对应能量从高到低的4条能带, 其余参数设置为$ \varGamma ' = 0.1 $

Fig. 5. Chern number as a function of the intensity of the interlayer exchange coupling interaction $ {J_0} $ and $ {J_1} $: (a)–(d) Correspond to four energy bands from high to low energy, the other parameters are set to $ \varGamma ' =0.1 $.

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图 6 陈数随层间交换耦合相互作用J₀和D强度变化图　(a)—(d)分别对应能量从高到低的4条能带, 其余参数设置为$ \varGamma ' = 0.1 $

Fig. 6. Chern number as a function of the intensity of the interlayer exchange coupling interaction $ {J_0} $ and $ D $: (a)–(d) Correspond to four energy bands from high to low energy, the other parameters are set to $ \varGamma ' = 0.1 $.

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图 7 (a) 不同$ {J_0} $强度下的磁子热霍尔系数随温度变化曲线, 其他参数设置为$ \varGamma '{=}0.1, \;{J_1} = {J_2} = 0 $; (b) 磁子热霍尔系数随$ {J_0} $强度变化曲线

Fig. 7. (a) Thermal Hall conductivity as a function of temperature under different intensity of interlayer exchange coupling interaction $ {J_0} $ with $ \varGamma '{=}0.1, \;{J_1} = {J_2} = 0 $; (b) thermal Hall conductivity as a function of different intensities of interlayer exchange coupling interaction $ {J_0} $.

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图 8 (a) 不同$ {J_0} $强度下的磁子能斯特系数随温度变化曲线, 其他参数设置为$ \varGamma '{=}0.1, \;{J_1} = {J_2} = 0 $; (b) 磁子能斯特系数随$ {J_0} $强度变化曲线

Fig. 8. (a) Magnon Nernst conductivity as a function of temperature under different intensity of interlayer exchange coupling interaction $ {J_0} $ with $ \varGamma '{=}0.1, \;{J_1} = {J_2} = 0 $; (b) magnon Nernst conductivity as a function of different intensities of interlayer exchange coupling interaction $ {J_0} $.

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表 1 色散曲线对应的陈数

Table 1. Corresponding Chern numbers of magnon band structures.

参数	陈数
参数	能带1	能带2	能带3	能带4
$ {J_0} = 0.1, \;\varGamma '{=}0.1, \;{J_1} = 0.1, \;{J_2} = {J_3} = 0 $	–2	0	2	0
$ {J_0} = 0.245, \;\varGamma '{=}0.1, \;{J_1} = 0.1, \;{J_2} = {J_3} = 0 $	0	–2	2	0
$ {J_0} = 0.3, \;\varGamma '{=}0.1, \;{J_1} = 0.1, \;{J_2} = {J_3} = 0 $	0	–2	2	0
$ {J_0} = 0.505, \;\varGamma '{=}0.1, \;{J_1} = 0.1, \;{J_2} = {J_3} = 0 $	0	–2	0	2
$ {J_0} = 0.9, \;\varGamma '{=}0.1, \;{J_1} = 0.1, \;{J_2} = {J_3} = 0 $	0	–2	0	2

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表 2 能带对应的陈数

Table 2. Corresponding Chern numbers of magnon band structures.

序号	陈数
序号	能带1	能带2	能带3	能带4
①	0	–2	0	2
②	0	–2	2	0
③	1	–3	2	0
④	–1	–1	2	0
⑤	–3	1	2	0
⑥	–2	0	2	0
⑦	–2	2	0	0
⑧	–1	1	0	0
⑨	–1	0	1	0

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map

[1]	Zhang S Q, Xu R Z, Luo N N, Zou X L 2021 Nanoscale 13 1398 Google Scholar
[2]	Liu Z R, Hua C B, Peng T, Chen R, Zhou B 2023 Phys. Rev. B 107 125302 Google Scholar
[3]	张志东 2015 64 067503 Google Scholar Zhang Z D 2015 Acta Phys. Sin. 64 067503 Google Scholar
[4]	Xu M L, Huang C X, Li Y W, Liu S Y, Zhong X, Jena P, Kan E J, Wang Y C 2020 Phys. Rev. Lett. 124 067602 Google Scholar
[5]	MacDonald A H 2019 Physics 12 12 Google Scholar
[6]	Cao Y, Fatemi V, Fang S, Watanabe K, Taniguchi T, Kaxiras E, Herrero P J 2018 Nature 556 43 Google Scholar
[7]	Tarnopolsky G, Kruchkov A J, Vishwanath A 2019 Phys. Rev. Lett. 122 106405 Google Scholar
[8]	Carr S, Fang S, Jarillo-Herrero P, Kaxiras E 2018 Phys. Rev. B 98 085144 Google Scholar
[9]	Yankowitz M, Chen S, Polshyn H, Zhang Y, Watanabe K, Taniguchi T, Graf D, Young A F, Dean C R 2019 Science 363 1059 Google Scholar
[10]	Ribeiro-Palau R, Zhang C, Watanabe K, Taniguchi T, Hone J, Dean C R 2018 Science 361 690 Google Scholar
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