Room-temperature quantum anomalous Hall effect in monolayer BaPb with large magnetocrystalline anisotropy energies

Zhang Wei-Xi; Li Yong; Tian Chang-Hai; She Yan-Chao

doi:10.7498/aps.70.20210014

Abstract

The quantum anomalous Hall effect is an intriguing quantum state that exhibits chiral edge states in the absence of a magnetic field. The chiral edge states are topologically protected and robust against electron scattering, which possesses great potential applications in designing low energy consumption and dissipation less spintronic devices. The experimental conditions are required to be very high, such as extremely low temperature (< 100 mK) due to the small band gap and the greatly accurate control of the extrinsic impurities. These greatly hinder their devices from being put into applications further. Hence, it would be meaningful to search for a new Chern insulator with a large band gap and high Curie temperature. According to the first-principles calculations, we predict the room temperature quantum anomalous Hall effect in the monolayer BaPb. The nontrivial topology of this new type of ferroelectric semi-metal material derives from fully spin-polarized quadratic non-Dirac bands. The quantum anomalous Hall effect can be realized in the monolayer BaPb with fully spin-polarized quadratic p_x,y non-Dirac bands with the nonzero Chern number (C = 1). Because of the trigonal symmetry of monolayer BaPb material, these bands composed of p_x,y orbitals are at the $ \varGamma $ point, which is different from the Dirac state formed by the p_z orbital reported previously. In addition, it can still retain its original topological properties even if strongly hybridized with the substrate. The calculated phonon spectrum shows no imaginary frequency in the entire Brillouin zone, indicating that the monolayer BaPb system is dynamically stable. By using Monte Carlo simulation, we determine the Curie temperature of BaPb monolayer toreach up to 378 K. We also calculate the magnetic anisotropy energy of the BaPb cell, defined as $ \Delta E={E_{100}}-{E_{001}} $. Here, we consider two magnetization easy-axis directions, [100] and [001]. To our surprise, the MAE of monolayer BaPb is as high as 52.01 meV/cell by considering the spin-orbit coupling effect. Furthermore, the nontrivial band gap is opened with a magnitude of 177.39 meV when the spin-orbit coupling effect is included. The calculations of Berry curvature and edge states further prove that the monolayer BaPb system can realize the quantum anomalous Hall state. This discovery indicates that the monolayer BaPb materials can be used as a candidate for quantum anomalous Hall effect materials, thereby promoting the development of spintronics.

Keywords:

Authors and contacts

Department of Physics and Electronic Engineering, Tongren University, Tongren 554300, China

Corresponding author: She Yan-Chao, ycshe@xtu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 12064038), the Scientific Research Program of Guizhou Province, China (Grant Nos. KY[2019]179, KY[2017]315, TK[2021] General projects -034), the Outstanding Young Science and Technology Talents of Guizhou Province, China (Grants No. [2019]5673), and the Science and Technology Foundation of Tongren Science and Technology Bureau, China (Grant No. [2020]77)

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References

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Cited By

图 1 (a) 单层BaPb的晶格结构; (b) 单层BaPb声子谱. 计算中使用一个4 × 4的超胞

Figure 1. (a) Lattice structure for monolayer BaPb; (b) the phonon dispersion curves monolayer BaPb. A 4 × 4 supercell is used in the calculation.

DownLoad: Full-Size Img PowerPoint

图 2 单分子层BaPb的铁磁构型(a)和反铁磁构型(b); (c)利用蒙特卡罗模拟得到的单层BaPb的磁矩与温度的关系

Figure 2. Two magnetic configurations for monolayer BaPb: (a) Ferromagnetic; (b) antiferromagnetic. (c) The average magnetic moment per unit cell with respect to temperature calculated for monolayer BaPb obtained by using Monte Carlo simulations.

DownLoad: Full-Size Img PowerPoint

图 3 单分子层BaPb的自旋极化能带结构

Figure 3. Spin-polarized band structure for monolayer BaPb.

DownLoad: Full-Size Img PowerPoint

图 4 考虑SOC时单层BaPb的能带结构　(a) 磁矩平面内沿x方向; (b) 磁矩平面外沿z方向

Figure 4. Band structures (including SOC) for monolayer BaPb: (a) With magnetic moments oriented in-plane along x; (b) with magnetic moments oriented out of the plane (along z directions).

DownLoad: Full-Size Img PowerPoint

图 5 (a) 反常霍尔电导率随费米能级移动的变化; (b) 动量空间中带有SOC的Berry曲率; (c) 计算得到的单层BaPb半无限片的边缘状态

Figure 5. (a) Anomalous Hall conductivity when the Fermi level is shifted around the original Fermi level; (b) the Berry curvature with SOC in the momentum space; (c) calculated edge state of a semi-infinite sheet for monolayer BaPb.

DownLoad: Full-Size Img PowerPoint

图 6 (a), (b) h-BN/BaPb异质结(h-BN/BaPb)体系中单分子层BaPb的结构晶体结构的俯视图和侧视图; (c) h-BN/BaPb异质结自旋极化能带结构; (d) 考虑SOC效应时h-BN/BaPb异质结体系中单分子层BaPb的带结构(考虑SOC效应)

Figure 6. Crystal structure of monolayer BaPb in the h-BN/BaPb heterostructure system: (a) Top and (b) side views. Here, the black solid lines denote the unit cell. (c) Spin-polarized band structure of h-BN/BaPb heterostructure; (d) the band structures (including SOC) of monolayer BaPb in the h-BN/BaPb heterostructure system.

DownLoad: Full-Size Img PowerPoint

图 7 利用蒙特卡罗模拟得到的h-BN/BaPb异质结的磁矩与温度的关系

Figure 7. Average magnetic moment per unit cell with respect to temperature calculated for the h-BN/BaPb heterojunction obtained by using Monte Carlo simulation.

DownLoad: Full-Size Img PowerPoint

map

[1]	Lu J M, Zheliuk O, Leermakers I, Yuan N F Q, Zeitler U, Lwa K T, Ye J T 2015 Science 350 1353 Google Scholar
[2]	Gong C, Zhang X 2019 Science 363 eaav4450
[3]	Deng Y, Yu Y, Shi M Z, Guo Z, Xu Z, Wang J, Chen X H, Zhang Y 2020 Science 367 895
[4]	高艺璇, 张礼智, 张余洋, 杜世萱 2018 67 238101 Google Scholar Gao Y X, Zhang L Z, Zhang Y Y, Du S X 2018 Acta Phys. Sin. 67 238101 Google Scholar
[5]	徐依全, 王聪 2020 69 184216 Google Scholar Xu Y Q, Wang C 2020 Acta Phys. Sin. 69 184216 Google Scholar
[6]	孙真昊, 管鸿明, 付雷, 沈波, 唐宁 2021 70 027302 Sun Z H, Guan H M, Fu L, Shen B, Tang N 2021 Acta Phys. Sin. 70 027302
[7]	Haldane F D M 1988 Phys. Rev. Lett. 61 2015 Google Scholar
[8]	Liu C X, Qi X L, Dai X, Fang Z, Zhang S C 2008 Phys. Rev. Lett. 101 146802 Google Scholar
[9]	Zhang H, Lazo C, Blügel S, Heinze S, Mokrousov Y 2012 Phys. Rev. Lett. 108 056802 Google Scholar
[10]	Hu J, Zhu Z, Wu R 2015 Nano Lett. 15 2074 Google Scholar
[11]	Li P, Li X, Zhao W, Chen H, Chen M X, Guo Z X, Feng J, Gong X G, MacDonald A H 2017 Nano Lett. 17 6195 Google Scholar
[12]	Li P 2019 Phys. Chem. Chem. Phys. 21 6712 Google Scholar
[13]	Onoda M, Nagaosa N 2003 Phys. Rev. Lett. 90 206601 Google Scholar
[14]	Hasan M Z, Kane C L 2010 Rev. Mod. Phys. 82 3045 Google Scholar
[15]	Luo W, Xiang H 2015 Nano Lett. 15 3230 Google Scholar
[16]	Checkelsky J G, Yoshimi R, Tsukazaki A, Takahashi K S, Kozuka Y, Falson J, Kawaski M, Tokura Y 2014 Nat. Phys. 10 731 Google Scholar
[17]	Bestwick A J, Fox E J, Kou X, Pan L, Wang K L, Goldhaber-Gordon D 2015 Phys. Rev. Lett. 114 187201 Google Scholar
[18]	Chang C Z, Zhao W, Kim D Y, Zhang H, Assaf B A, Heiman D, Zhang S C, Liu C, Chan M H W, Moodera J S 2015 Nat. Mater. 14 473 Google Scholar
[19]	Ou Y, Liu C, Jiang G, Feng Y, Zhao D, Wu W, Wang X X, Li W, Song C, Wang L L, Wang W, Wu W, Wang Y, He K, Ma X C, Xue Q K 2018 Adv. Mater. 30 1703062 Google Scholar
[20]	Otrokov M M, Rusinov I P, Blanco-Rey M, Hoffmann M, Vyazovskaya A Y, Eremeev S V, Ernst A, Echenique P M, Arnau A, Chulkov E V 2019 Phys. Rev. Lett. 122 107202 Google Scholar
[21]	Zhang D, Shi M, Zhu T, Xing D, Zhang H, Wang J 2019 Phys. Rev. Lett. 122 206401 Google Scholar
[22]	Otrokov M M, Klimovskikh I I, Chulkov E V 2019 Nature 576 416 Google Scholar
[23]	Wang S, Yu Z, Liu Y, Jiao Y, Guan S, Sheng X, Yang S A 2019 Phys. Rev. Materials 3 084201 Google Scholar
[24]	Kong X, Li L, Leenaerts O, Wang W, Liu X, Peeters F M 2018 Nanoscale 10 8153 Google Scholar
[25]	Gong C, Li L, Li Z, Ji H, Stern A, Xia Y, Cao T, Bao W, Wang C, Wang Y, Qiu Z Q, Cava R J, Louie S G, Xia J, Zhang X 2017 Nature 546 265 Google Scholar
[26]	Huang B, Clark G, Navarro-Moratalla E, Klein D R, Cheng R, Seyler K L, Zhong D, Schmidgall E, McGuire M A, Cobden D H, Yao W, Xiao D, Jarillo-Herrero P, Xu X 2017 Nature 546 270 Google Scholar
[27]	Zhang Z, Shang J, Jiang C, Rasmita A, Gao W, Yu T 2019 Nano Lett. 19 3138 Google Scholar
[28]	Kresse G, Hafner J 1993 Phys. Rev. B 47 558 Google Scholar
[29]	Blochl P E 1994 Phys. Rev. B 50 17953 Google Scholar
[30]	Dudarev S L, Botton G A, Savrasov S Y, Humphreys C J, Sutton A P 1998 Phys. Rev. B 57 1505 Google Scholar
[31]	Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865 Google Scholar
[32]	Mostofi A A, Yates J R, Lee Y S, Souza I, Vanderbilt D, Marzari N 2008 Comput. Phys. Commun. 178 685 Google Scholar
[33]	Wu Q S, Zhang S N, Song H F, Troyer M, Suluyanov A A 2018 Comput. Phys. Commun. 224 405 Google Scholar
[34]	Zhuang H L, Henning R G 2013 Appl. Phys. Lett. 103 212102 Google Scholar
[35]	Evans R F, Fan W J, Chureemart P, Ostler T A, Ellis M O, Chantrell R W 2014 J. Phys. Condens. Matter. 26 103202 Google Scholar
[36]	Thouless D J, Kohmoto M, Nightingale M P, den Nijs M 1982 Phys. Rev. Lett. 49 405 Google Scholar
[37]	Zhang R W, Zhang C W, Ji W X, Yan S S, Yao Y G 2017 Nanoscale 9 8207 Google Scholar
[38]	Reis F, Li G, Dudy L, Bauernfeind M, Glass S, Hanke W, Thomale R, Schafer J, Claessen R 2017 Science 357 287 Google Scholar

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