Spin-Orbit Splitting in Single-Layer MoS2 Revealed by Triply Resonant Raman Scattering

被引：135

作者：

Sun, Linfeng ^{[1
]}

Yan, Jiaxu ^{[1
]}

Zhan, Da ^{[1
,2
]}

Liu, Lei ^{[3
]}

Hu, Hailong ^{[1
,2
]}

Li, Hong ^{[4
]}

Tay, Ben Kang ^{[4
]}

Kuo, Jer-Lai ^{[5
]}

Huang, Chung-Che ^{[6
]}

Hewak, Daniel W. ^{[6
]}

Lee, Pooi See ^{[2
]}

Shen, Ze Xiang ^{[1
,2
]}

机构：

[1] Nanyang Technol Univ, Sch Phys & Math Sci, Ctr Disrupt Photon Technol, Singapore 637371, Singapore

[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Mat Technol Div, Singapore 639798, Singapore

[3] Chinese Acad Sci, CIOMP, Key Lab Luminescence & Applicat, Changchun 130033, Peoples R China

[4] Nanyang Technol Univ, Sch Elect & Elect Engn, Microelect Ctr, Singapore 639798, Singapore

[5] Acad Sinica, Inst Atom & Mol Sci, Taipei 10617, Taiwan

[6] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

TOTAL-ENERGY CALCULATIONS; TRANSITION;

D O I：

10.1103/PhysRevLett.111.126801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Although new spintronic devices based on the giant spin-orbit splitting of single-layer MoS2 have been proposed, such splitting has not been studied effectively in experiments. This Letter reports the valence band spin-orbit splitting in single-layer MoS2 for the first time, probed by the triply resonant Raman scattering process. We found that upon 325 nm laser irradiation, the second order overtone and combination Raman modes of single-layer MoS2 are dramatically enhanced. Such resonant Raman enhancement arises from the electron-two-phonon triple resonance via the deformation potential and Fro "hlich interaction. As a sensitive and precise probe for the spin-orbit splitting, the triply resonant Raman scattering will provide a new and independent route to study the spin characteristics of MoS2.

引用

页数：5

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