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

หน่วยงาน Nanyang Technological University, Singapore

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ชื่อเรื่อง : Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals : raman spectroscopy and first-principles studies
นักวิจัย : Zhao, Yanyuan , Luo, Xin , Zhang, Jun , Wu, Junxiong , Bai, Xuxu , Wang, Meixiao , Jia, Jinfeng , Peng, Hailin , Liu, Zhongfan , Quek, Su Ying , Xiong, Qihua
คำค้น : DRNTU::Science::Physics
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2557
อ้างอิง : Zhao, Y., Luo, X., Zhang, J., Wu, J., Bai, X., Wang, M., et al. (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), 245428-. , 1098-0121 , http://hdl.handle.net/10220/24696 , http://dx.doi.org/10.1103/PhysRevB.90.245428
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical review B
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

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 (<30cm−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 (<12cm−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.

บรรณานุกรม :
Zhao, Yanyuan , Luo, Xin , Zhang, Jun , Wu, Junxiong , Bai, Xuxu , Wang, Meixiao , Jia, Jinfeng , Peng, Hailin , Liu, Zhongfan , Quek, Su Ying , Xiong, Qihua . (2557). Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals : raman spectroscopy and first-principles studies.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Zhao, Yanyuan , Luo, Xin , Zhang, Jun , Wu, Junxiong , Bai, Xuxu , Wang, Meixiao , Jia, Jinfeng , Peng, Hailin , Liu, Zhongfan , Quek, Su Ying , Xiong, Qihua . 2557. "Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals : raman spectroscopy and first-principles studies".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Zhao, Yanyuan , Luo, Xin , Zhang, Jun , Wu, Junxiong , Bai, Xuxu , Wang, Meixiao , Jia, Jinfeng , Peng, Hailin , Liu, Zhongfan , Quek, Su Ying , Xiong, Qihua . "Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals : raman spectroscopy and first-principles studies."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2557. Print.
Zhao, Yanyuan , Luo, Xin , Zhang, Jun , Wu, Junxiong , Bai, Xuxu , Wang, Meixiao , Jia, Jinfeng , Peng, Hailin , Liu, Zhongfan , Quek, Su Ying , Xiong, Qihua . Interlayer vibrational modes in few-quintuple-layer Bi2Te3 and Bi2Se3 two-dimensional crystals : raman spectroscopy and first-principles studies. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2557.