Unveiling the Fine Structural Distortion of Atomically Thin Bi2O2Se by Third-Harmonic Generation

Liang, Jing1; Tu, Teng3; Chen, Guanchu1,3; Sun, Yuanwei4; Qiao, Ruixi4; Ma, He1,2; Yu, Wentao1; Zhou, Xu1; Ma, Chaojie1; Gao, Peng4; Peng, Hailin3; Liu, Kaihui1,2; Yu, Dapeng5,6

2020-06-25

10.1002/adma.202002831

ADVANCED MATERIALS   影响因子和分区

0935-9648

1521-4095

Bismuth oxyselenide (Bi2O2Se), a new type of 2D material, has recently attracted increased attention due to its robust bandgap, stability under ambient conditions, and ultrahigh electron mobility. In such complex oxides, fine structural distortion tends to play a decisive role in determining the unique physical properties, such as the ferrorotational order, ferroelectricity, and magnetoelasticity. Therefore, an in-depth investigation of the fine structural symmetry of Bi2O2Se is necessary to exploit its potential applications. However, conventional techniques are either time consuming or requiring tedious sample treatment. Herein, a noninvasive and high-throughput approach is reported for characterizing the fine structural distortion in 2D centrosymmetric Bi2O2Se by polarization-dependent third-harmonic generation (THG). Unprecedentedly, the divergence between the experimental results and the theoretical prediction of the perpendicular component of polarization-dependent THG indicates a fine structural distortion, namely, a <1.4 degrees rotation of the oxygen square in the tetragonal (Bi2O2) layers. This rotation breaks the intrinsic mirror symmetry of 2D Bi2O2Se, eventually reducing the symmetry from the D(4h)to the C(4h)point group. The results demonstrate that THG is highly sensitive to even fine symmetry variations, thereby showing its potential to uncover hidden phase transitions and interacting polarized sublattices in novel 2D material systems.

2D materials fine structural distortion third-harmonic generation

SCI ; EI

英语

NI论文

其他

Key R&D Program of Guangdong Province[2019B010931001][2020B010189001][2018B010109009][2018B030327001] ; National Natural Science Foundation of China[51991340][51991342][21920102004][21733001][21525310][51672007] ; Beijing Natural Science Foundation[JQ19004] ; Beijing Excellent Talents Training Support[2017000026833ZK11] ; National Key R&D Program of China[2016YFA0300903][2016YFA0300804] ; Beijing Municipal Science & Technology Commission[Z191100007219005] ; Beijing Graphene Innovation Program[Z181100004818003] ; Bureau of Industry and Information Technology of Shenzhen (Graphene platform)[201901161512] ; Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06D348] ; Science, Technology and Innovation Commission of Shenzhen Municipality[KYTDPT20181011104202253] ; China Postdoctoral Science Foundation[2019M660281] ; National Equipment Program of China[ZDYZ2015-1]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000542661600001

WILEY-V C H VERLAG GMBH

20202708892830

Bismuth compounds ; Selenium compounds ; Polarization ; Harmonic analysis

Numerical Methods:921.6

MATERIALS SCIENCE

Web of Science

1.Peking Univ, State Key Lab Mesoscop Phys, Frontiers Sci Ctr Nanooptoelect, Sch Phys, Beijing 100871, Peoples R China
2.Peking Univ, Acad Adv Interdisciplinary Studies, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
3.Peking Univ, Beijing Sci & Engn Ctr Nanocarbons, Coll Chem & Mol Engn, Ctr Nanochem, Beijing 100871, Peoples R China
4.Peking Univ, Int Ctr Quantum Mat, Electron Microscopy Lab, Sch Phys, Beijing 100871, Peoples R China
5.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
6.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Liang, Jing,Tu, Teng,Chen, Guanchu,et al. Unveiling the Fine Structural Distortion of Atomically Thin Bi2O2Se by Third-Harmonic Generation[J]. ADVANCED MATERIALS,2020,32(31).

Liang, Jing.,Tu, Teng.,Chen, Guanchu.,Sun, Yuanwei.,Qiao, Ruixi.,...&Yu, Dapeng.(2020).Unveiling the Fine Structural Distortion of Atomically Thin Bi2O2Se by Third-Harmonic Generation.ADVANCED MATERIALS,32(31).

Liang, Jing,et al."Unveiling the Fine Structural Distortion of Atomically Thin Bi2O2Se by Third-Harmonic Generation".ADVANCED MATERIALS 32.31(2020).