Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals

doi:10.1088/1674-1056/27/8/086301

中国物理B ›› 2018, Vol. 27 ›› Issue (8): 86301-086301.doi: 10.1088/1674-1056/27/8/086301

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals

Gan Hu(胡干), Jian-Qi Huang(黄建啟), Ya-Ning Wang(王雅宁), Teng Yang(杨腾), Bao-Juan Dong(董宝娟), Ji-Zhang Wang(王吉章), Bo Zhao(赵波), Sajjad Ali(阿里·萨贾德), Zhi-Dong Zhang(张志东)

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2 School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China;
3 College of Sciences, Liaoning Shihua University, Fushun 113001, China

收稿日期:2018-05-04 修回日期:2018-05-17 出版日期:2018-08-05 发布日期:2018-08-05
通讯作者: Teng Yang E-mail:yangteng@imr.ac.cn,yanghaiteng@msn.com
基金资助:
Project supported by the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation from NSFC and CASC, China (Grant No. U1537204), the National Key Research and Development Program of China (Grant No. 2017YFA0206301), and the National Natural Science Foundation of China (Grant No. 51702146).

Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals

Gan Hu(胡干)^1,2, Jian-Qi Huang(黄建啟)^1,2, Ya-Ning Wang(王雅宁)^1,2, Teng Yang(杨腾)^1,2, Bao-Juan Dong(董宝娟)^1,2, Ji-Zhang Wang(王吉章)^1,2, Bo Zhao(赵波)³, Sajjad Ali(阿里·萨贾德)^1,2, Zhi-Dong Zhang(张志东)^1,2

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2 School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China;
3 College of Sciences, Liaoning Shihua University, Fushun 113001, China

Received:2018-05-04 Revised:2018-05-17 Online:2018-08-05 Published:2018-08-05
Contact: Teng Yang E-mail:yangteng@imr.ac.cn,yanghaiteng@msn.com
Supported by:
Project supported by the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation from NSFC and CASC, China (Grant No. U1537204), the National Key Research and Development Program of China (Grant No. 2017YFA0206301), and the National Natural Science Foundation of China (Grant No. 51702146).

摘要/Abstract

摘要：

Unusual quadratic dispersion of flexural vibrational mode and red-shift of Raman shift of in-plane mode with increasing layer-number are quite common and interesting in low-dimensional materials, but their physical origins still remain open questions. Combining ab initio density functional theory calculations with the empirical force-constant model, we study the lattice dynamics of two typical two-dimensional (2D) systems, few-layer h-BN and indium iodide (InI). We found that the unusual quadratic dispersion of flexural mode frequency on wave vector may be comprehended based on the competition between atomic interactions of different neighbors. Long-range interaction plays an essential role in determining the dynamic stability of the 2D systems. The frequency red-shift of in-plane Raman-active mode from monolayer to bulk arises mainly from the reduced long-range interaction due to the increasing screening effect.

关键词: flexural mode, quadratic dispersion, long-range interaction, frequency redshift, dielectric screening

Abstract:

Key words: flexural mode, quadratic dispersion, long-range interaction, frequency redshift, dielectric screening

中图分类号: (Phonons or vibrational states in low-dimensional structures and nanoscale materials)

63.22.-m

63.20.D- (Phonon states and bands, normal modes, and phonon dispersion) 63.22.Np (Layered systems)

胡干, 黄建啟, 王雅宁, 杨腾, 董宝娟, 王吉章, 赵波, 阿里·萨贾德, 张志东. Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals[J]. 中国物理B, 2018, 27(8): 86301-086301.

Gan Hu(胡干), Jian-Qi Huang(黄建啟), Ya-Ning Wang(王雅宁), Teng Yang(杨腾), Bao-Juan Dong(董宝娟), Ji-Zhang Wang(王吉章), Bo Zhao(赵波), Sajjad Ali(阿里·萨贾德), Zhi-Dong Zhang(张志东). Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals[J]. Chin. Phys. B, 2018, 27(8): 86301-086301.

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Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals

Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals

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