Control of electric properties of silicene heterostructure by  reversal of ferroelectric polarization

Ding Jun; Wen Li-Wei; Li Rui-Xue; Zhang Ying

doi:10.7498/aps.71.20220815

Abstract

Silicene is a kind of two-dimensional material composed of a honeycomb arrangement of silicon atoms. Compared with the structure of graphene, the buckled structure of silicene weakens the $\pi—\pi$ overlaps and turns the hybrid orbitals from $\rm sp^2$ to $\rm sp^3$, which enhances the spin-orbit coupling strength but still preserves the Dirac cone near K or K'. Owing to its buckled structure, silicene is susceptible to external parameters like electric field and substrate, which draws lots of attention both experimentally and theoretically. Recent progress of ferroelectricity in two-dimensional (2D) van der Waals materials found that the spontaneous ferroelectric polarization can be preserved even above room temperature, which inspires us to investigate how to tune the electric properties of silicene through the spontaneous polarization field of 2D ferroelectric substrate. ${\rm In_{2}}X_3$ (X = Se,S,Te) Family recently were found to have single ferroelectric monolayers with reversible spontaneous electric polarization in both out-of-plane and in-plane orientations, and the lattice mismatch between silicene and $\rm In_{2}S_3$is negligible. Therefore, we investigate the stacking and electric properties of silicene and monolayer $\rm In_{2}S_3$ heterostructure by the first-principles calculations. The spontaneous polarization field of $\rm In_{2}S_3$ is calculated to be 1.26 $\rm μC {\cdot} cm^{-2}$, comparable to the experimental results of $\rm In_{2}Se_3$. We compare the different stacking order between silicene and $\rm In_{2}S_3$. The calculated results shown that the AB stacking is the ground state stacking order, and the reversal of the ferroelectric polarization could tune the band structure of heterostructure. When the polarization direction of $\rm In_{2}S_3$ is upward, the layer distance between silicene and $\rm In_{2}S_3$ is 3.93 Å, the polarization field and substrate interaction together break the AB sublattice symmetry and induce a 1.8 meV band gap near the Dirac point of K and K', while the Berry curvature around K and K' have opposite signs, corresponding to valley Hall effect. When the polarization is downward, the layer distance decreases to 3.62 Å and the band gap around K and K' both increase to 30.8 meV. At the same time a 0.04e charge transfer makes some bands move across the Fermi energy, corresponding to metal state. Our results pave the way for studying the ferroelectric tuning silicene heterostructures and their potential applications in information industry.

Keywords:

Authors and contacts

1.
College of Science, Henan University of Engineering, Zhengzhou 451191, China
2.
Department of Physics, Beijing Normal University, Beijing 100875, China

Corresponding author: Ding Jun, dingjun@haue.edu.cn ; Zhang Ying, yingzhang@bnu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11604078, 11835003, 11347187).

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References

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Cited By

图 1 硅烯与${\rm{In}}_{2}{\rm{S}}_3$异质结的结构图　(a), (b) AA堆垛的俯视图和侧视图; (c), (d) AB堆垛的俯视图和侧视图

Figure 1. The structure of Silicene/${\rm{In}}_{2}{\rm{S}}_3$ heterostructure: (a), (b) the top and side view of AA stacking; (c), (d) the top and side view of AB stacking

DownLoad: Full-Size Img PowerPoint

图 2 沿晶体表面不同方向横向平移时堆垛能变化情况. 图中给出沿[100](红色虚线)和[110](黑色实线)方向平移时堆垛能变化情况, AB堆垛在平面内平移[2/3, 2/3]即可得到AA堆垛

Figure 2. Stacking energy as a function of lateral shift with respect AB stacking. The stacking energy are shown both for [100] (dotted red line) and [110] (solid black line) directions. AB stacking corresponding to a fractional lateral shift of [2/3, 2/3] of the top layer compared to AA stacking

DownLoad: Full-Size Img PowerPoint

图 3 硅烯/${\rm{In}}_{2}{\rm{S}}_3$异质结能带图　(a)和(b)分别对应${\rm{In}}_{2}{\rm{S}}_3$极化方向向上和向下

Figure 3. Band structure of silicene/${\rm{In}}_{2}{\rm{S}}_3$ heterostructure: (a) and (b) corresponding to the polarization of ${\rm{In}}_{2}{\rm{S}}_3$ upward and downward, respectively

DownLoad: Full-Size Img PowerPoint

图 4 硅烯/${\rm{In}}_{2}{\rm{S}}_3$异质结能带在K和K' 附近放大图　(a), (c)没有考虑自旋轨道耦合; (b), (d)考虑自旋轨道耦合, 红色虚线对应贝利曲率

Figure 4. Enlarged band structure of Silicene/$\rm In_{2}S_3$ heterostructure around K and K': (a), (c) Calculations without spin orbit coupling; (b), (d) with spin orbit coupling, the red dotted line is the Berry curvature

DownLoad: Full-Size Img PowerPoint

图 5 硅烯/${\rm{In}}_{2}{\rm{S}}_3$异质结垂直于界面方向局域势函数的平均值

Figure 5. Plane-averaged local potential of silicene/${\rm{In}}_{2}{\rm{S}}_3$ heterostructure

DownLoad: Full-Size Img PowerPoint

表 1 ${\rm{In}}_{2}{\rm{S}}_3$极化方向改变时总能量, 结合能以及层间距和能隙变化情况. 能隙单位为meV, SOC指考虑自旋轨道耦合后数值

Table 1. Total energy, adhesion energy, layer distance and energy gap with the polarization of ${\rm{In}}_{2}{\rm{S}}_3$ upward and downward. SOC refers to the energy gap (meV) calculated with spin-orbit coupling

	$E_{{\rm{tot}}}$/meV	$E_{{\rm{ad}}}$/meV	d/Å	$E_{\rm{g}}$ (SOC)
${\rm{P} }_{ {\rm{In} }_2{\rm{S} }_3}$-up	22.87	12.51	3.93	13.6 (1.8)
${\rm{P} }_{ {\rm{In} }_2{\rm{S} }_3}$-down	0	37.16	3.62	33.3 (30.8)

DownLoad: CSV

[1]	Qiao Z, Tse W K, Jiang H, Yao Y, Niu Q 2011 Phys. Rev. Lett. 107 256801
[2]	Liu C C, Feng W, Yao Y 2011 Phys. Rev. Lett. 107 076802 Google Scholar
[3]	Zhao J, Liu H, Yu Z, Quhe R, Zhou S, Wang Y, Liu C C, Zhong H, Han N, Lu J, Yao Y, Wu K 2016 Prog. Mater. Sci. 83 24
[4]	Oostinga J B, Heersche H B, Liu X, Morpurgo A F, Vandersypen L M K 2008 Nat. Mater. 7 151 Google Scholar
[5]	Zhang Y, Tang T T, Girit C, Hao Z, Martin M C, Zettl A, Crommie M F, Shen Y R, Wang F 2009 Nature 459 820 Google Scholar
[6]	Drummond N D, Zólyomi V, Fal'ko V I 2012 Phys. Rev. B 85 075423 Google Scholar
[7]	Yu Z, Pan H, Yao, Y 2015 Phys. Rev. B 92 155419 Google Scholar
[8]	Ezawa M 2012 Phys. Rev. Lett. 109 055502 Google Scholar
[9]	Ezawa M 2013 Phys. Rev. Lett. 110 026603 Google Scholar
[10]	Ezawa M 2012 New J. Phys. 14 033003 Google Scholar
[11]	Tao L, Cinquanta E, Chiappe D, Grazianetti C, Fanciulli M, Dubey M, Molle A, Akinwande D 2015 Nat. Nanotechnol. 10 227
[12]	Vali M, Dideban D, Moezi N 2016 J. Comput. Electron. 15 138
[13]	计青山, 郝鸿雁, 张存喜, 王瑞 2015 物理学报 64 087302 Google Scholar Ji Q S, Hao H Y, Zhang C X, Wang R 2015 Acta Phys. Sin. 64 087302 Google Scholar
[14]	侯海燕, 姚慧, 李志坚, 聂一行 2018 物理学报 67 086801 Google Scholar Hou H Y, Yao H, Li Z J, Nie Y X 2018 Acta Phys. Sin. 67 086801 Google Scholar
[15]	Vogt P, De Padova P, Quaresima C, Avila J, Frantzeskakis E, Asensio M C, Resta A, Ealet B, Le Lay G 2012 Phys. Rev. Lett. 108 155501 Google Scholar
[16]	Feng B, Ding Z, Meng S, Yao Y, He X, Cheng P, Chen L, Wu K 2012 Nano Lett. 12 3507 Google Scholar
[17]	Chiappe D, Scalise E, Cinquanta E, Grazianetti C, van den Broek B, Fanciulli M, Houssa M, Molle A 2014 Adv. Mater. 26 2096 Google Scholar
[18]	Li G, Zhang L, Xu W, Pan J, Song S, Zhang Y, Zhou H, Wang Y, Bao L, Zhang Y Y, Du S, Ouyang M, Pantelides S T, Gao H J 2018 Adv. Mater. 30 1804650 Google Scholar
[19]	Novoselov K S, Mishchenko A, Carvalho A, Castro Neto A H 2016 Science 353 6298
[20]	Liu Y, Zhang S, He J, Wang Z M, Liu Z 2019 Nano-Micro Lett. 11 13 Google Scholar
[21]	Zheng Y, Ni G X, Toh C T, Tan C Y, Yao K, Özyilmaz B 2010 Phys. Rev. Lett. 105 166602 Google Scholar
[22]	Ding J, Wen L W, Li H D, Zhang Y 2017 Phys. Lett. A 381 1749 Google Scholar
[23]	Fei Z, Zhao W, Palomaki T A, Sun B, Miller M K, Zhao Z, Yan J, Xu X, Cobden D H 2018 Nature 560 336 Google Scholar
[24]	Zhang J J, Zhu D, Yakobson B I 2021 Nano Lett. 21 785 Google Scholar
[25]	王慧, 徐萌, 郑仁奎 2020 物理学报 69 017301 Google Scholar Wang H, Xu M, Zheng R K 2020 Acta Phys. Sin. 69 017301 Google Scholar
[26]	Ye Q, Shen Y, Duan C 2021 Chin. Phys. Lett. 38 087702 Google Scholar
[27]	Chang K, Liu J, Lin H, Wang N, Zhao K, Zhang A, Jin F, Zhong Y, Hu X, Duan W, Zhang Q, Fu L, Xue Q K, Chen X, Ji S H 2016 Science 353 274 Google Scholar
[28]	Liu F, You L, Seyler K L, Li X, Yu P, Lin J, Wang X, Zhou J, Wang H, He H, Pantelides S T, Zhou W, Sharma P, Xu X, Ajayan P M, Wang J, Liu Z 2016 Nat. Commun. 7 12357 Google Scholar
[29]	Ding W, Zhu J, Wang Z, Gao Y, Xiao D, Gu Y, Zhang Z, Zhu W 2017 Nat. Commun. 8 14956 Google Scholar
[30]	Ding J, Wen L W, Wang Z P, Zhang Y 2021 Mater. Today Commun. 27 102452 Google Scholar
[31]	Ding J, Wen L W, Chai W W, Liu S C, Li R X, Li H D, Zhang Y 2021 Appl. Surf. Sci. 567 150871 Google Scholar
[32]	宋蕊, 王必利, 冯凯, 王黎, 梁丹丹 2022 物理学报 71 037101 Google Scholar Song R, Wang B L, Feng K, Wang L, Liang D D 2022 Acta Phys. Sin. 71 037101 Google Scholar
[33]	Kresse G, Furthmüller J 1996 Phys. Rev. B 54 11169 Google Scholar
[34]	Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865 Google Scholar
[35]	Grimme S, Antony J, Ehrlich S, Krieg H 2010 J. Chem. Phys. 132 154104 Google Scholar
[36]	Ding J, Shao D F, Li M, Wen L W, Tsymbal E Y 2021 Phys. Rev. Lett. 126 057601 Google Scholar
[37]	Wan S, Li Y, Li W, Mao X, Wang C, Chen C, Dong J, Nie A, Xiang J, Liu Z, Zhu W, Zeng H 2019 Adv. Funct. Mater. 29 1808606 Google Scholar
[38]	Sivadas N, Okamoto S, Xu X, Fennie C J, Xiao D 2018 Nano Lett. 18 7658 Google Scholar
[39]	Chen M X, Zhong Z, Weinert M 2016 Phys. Rev. B 94 075409 Google Scholar
[40]	Xiao D, Yao W, Niu Q 2007 Phys. Rev. Lett. 99 236809 Google Scholar
[41]	Pan H, Li Z, Liu C C, Zhu G, Qiao Z, Yao Y 2014 Phys. Rev. Lett. 112 106802
[42]	Thouless D J, Kohmoto M, Nightingale M P, den Nijs M 1982 Phys. Rev. Lett. 49 405 Google Scholar
[43]	Yao Y, Kleinman L, MacDonald A H, Sinova J, Jungwirth T, Wang D S, Wang E, Niu Q 2004 Phys. Rev. Lett. 92 037204 Google Scholar

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