Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals: Raman spectroscopy and first-principles studies

doi:10.1103/PhysRevB.90.245428

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	Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals: Raman spectroscopy and first-principles studies
	Zhao, Yanyuan 1; Luo, Xin 2,5,6; Zhang, Jun 1; Wu, Junxiong 3; Bai, Xuxu 4; Wang, Meixiao 4; Jia, Jinfeng 4; Peng, Hailin 3; Liu, Zhongfan 3; Quek, Su Ying 2,5,6
刊名	PHYSICAL REVIEW B
	2014-12-23
卷号	90 期号:24
ISSN号	1098-0121
DOI	10.1103/PhysRevB.90.245428
英文摘要	Layered materials, such as graphite/graphene, boron nitride, transition metal dichalcogenides, represent materials in which reduced size, dimensionality, and symmetry play critical roles in their physical properties. Here, we report on a comprehensive investigation of the phonon properties in the topological insulator Bi2Te3 and Bi2Se3 two-dimensional (2D) crystals, with the combination of Raman spectroscopy, first-principles calculations, and group theory analysis. Low frequency (<30 cm (1)) interlayer vibrational modes are revealed in few-quintuple-layer (QL) Bi2Te3/Bi2Se3 2D crystals, which are absent in the bulk crystal as a result of different symmetries. The experimentally observed interlayer shear and breathing mode frequencies both show blueshifts, with decreasing thickness in few-QL Bi2Te3 (down to 2QL) and Bi2Se3 (down to 1QL), in agreement with first-principles calculations and a linear chain model, from which the interlayer coupling force constants can be estimated. Besides, an intense ultralow (<12 cm(-1)) frequency peak is observed in 2-4QL Bi2Te3, which is tentatively attributed to a substrate-induced interface mode supported by a linear chain model analysis. The high frequency Raman peaks exhibit frequency shifts and broadening from 3D to 2D as a result of the phonon confinement effect. Our studies shed light on a general understanding of the influence of dimensionality and crystal symmetry on the phonon properties in layered materials.
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000346862200006
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/52981]
专题	中国科学院化学研究所
通讯作者	Quek, Su Ying
作者单位	1.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore 2.Inst High Performance Comp, Singapore 138632, Singapore 3.Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, Ctr Nanochem, Beijing 100871, Peoples R China 4.Shanghai Jiao Tong Univ, Minist Educ, Key Lab Artificial Struct & Quantum Control, Dept Phys, Shanghai 200240, Peoples R China 5.Natl Univ Singapore, Ctr Adv Mat 2D, Dept Phys, Singapore 117546, Singapore 6.Natl Univ Singapore, Graphene Res Ctr, Singapore 117546, Singapore 7.Nanyang Technol Univ, Sch Elect & Elect Engn, Nanoelect Ctr Excellence, NOVITAS, Singapore 639798, Singapore
推荐引用方式 GB/T 7714	Zhao, Yanyuan,Luo, Xin,Zhang, Jun,et al. Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals: Raman spectroscopy and first-principles studies[J]. PHYSICAL REVIEW B,2014,90(24).
APA	Zhao, Yanyuan.,Luo, Xin.,Zhang, Jun.,Wu, Junxiong.,Bai, Xuxu.,...&Xiong, Qihua.(2014).Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals: Raman spectroscopy and first-principles studies.PHYSICAL REVIEW B,90(24).
MLA	Zhao, Yanyuan,et al."Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals: Raman spectroscopy and first-principles studies".PHYSICAL REVIEW B 90.24(2014).