题名 | Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides |
作者 | |
通讯作者 | Yao, Wang |
发表日期 | 2013-04-11
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DOI | |
发表期刊 | |
ISSN | 2045-2322
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卷号 | 3 |
摘要 | We report systematic optical studies of WS2 and WSe2 monolayers and multilayers. The efficiency of second harmonic generation shows a dramatic even-odd oscillation with the number of layers, consistent with the presence (absence) of inversion symmetry in even-layer (odd-layer). Photoluminescence (PL) measurements show the crossover from an indirect band gap semiconductor at multilayers to a direct-gap one at monolayers. A hot luminescence peak (B) is observed at similar to 0.4 eV above the prominent band edge peak (A) in all samples. The magnitude of A-B splitting is independent of the number of layers and coincides with the spin-valley coupling strength in monolayers. Ab initio calculations show that this thickness independent splitting pattern is a direct consequence of the giant spin-valley coupling which fully suppresses interlayer hopping at valence band edge near K points because of the sign change of the spin-valley coupling from layer to layer in the 2H stacking order. |
相关链接 | [来源记录] |
收录类别 | |
语种 | 英语
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重要成果 | ESI高被引
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学校署名 | 其他
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资助项目 | National Basic Research Program of China (973 Program)[2012CB922002]
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WOS研究方向 | Science & Technology - Other Topics
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WOS类目 | Multidisciplinary Sciences
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WOS记录号 | WOS:000317334200001
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出版者 | |
来源库 | Web of Science
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引用统计 |
被引频次[WOS]:707
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成果类型 | 期刊论文 |
条目标识符 | http://kc.sustech.edu.cn/handle/2SGJ60CL/30358 |
专题 | 理学院_物理系 |
作者单位 | 1.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China 2.South Univ Sci & Technol China, Dept Phys, Shenzhen, Guangdong, Peoples R China 3.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China 4.Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China 5.Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China 6.Beijing Inst Technol, Sch Phys, Beijing 100081, Peoples R China |
推荐引用方式 GB/T 7714 |
Zeng, Hualing,Liu, Gui-Bin,Dai, Junfeng,et al. Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides[J]. Scientific Reports,2013,3.
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APA |
Zeng, Hualing.,Liu, Gui-Bin.,Dai, Junfeng.,Yan, Yajun.,Zhu, Bairen.,...&Cui, Xiaodong.(2013).Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides.Scientific Reports,3.
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MLA |
Zeng, Hualing,et al."Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides".Scientific Reports 3(2013).
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条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | 操作 | |
10.1038srep01608.pdf(1394KB) | -- | -- | 开放获取 | -- | 浏览 |
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