Unveiling exceptionally robust valley contrast in AA- and AB-stacked bilayer WS2
文献类型：期刊论文
| 作者 | Wang, Yanlong2,5; Cong, Chunxiao1; Shang, Jingzhi5; Eginligil, Mustafa3,4; Jin, Yuqi2; Li, Gang2; Chen, Yu5; Peimyoo, Namphung5; Yu, Ting5 |
| 刊名 | NANOSCALE HORIZONS
 |
| 出版日期 | 2019-03-01 |
| 卷号 | 4期号:2页码:396-403 |
| ISSN号 | 2055-6756 |
| DOI | 10.1039/c8nh00306h |
| 通讯作者 | Cong, Chunxiao(cxcong@fudan.edu.cn) ; Yu, Ting(yuting@ntu.edu.sg) |
| 英文摘要 | Valleytronics is a particularly interesting field that employs the valley degree of freedom for information manipulation. The fascinating prospects for realizing valleytronic devices have inspired persistent efforts towards exploring material systems with robust valley polarization. Monolayer transition metal dichalcogenides (TMDs) obey the well-known valley-dependent selection rule as a result of their inversion asymmetry. However, for inversionsymmetric bilayer tungsten-based TMDs, highly selective valley polarization has been surprisingly observed and is not yet fully understood. Here we systematically study the origin of the anomalously high valley polarization in bilayer WS2 by temperature-dependent polarization-resolved photoluminescence measurements. It is found that acoustic phonons play a critical role in the valley polarization of bilayer WS2. For some WS2 bilayers with relatively small intensity ratios of indirect to direct bandgap emission, acoustic phonons could remarkably assist the intervalley scattering process and smear the valley contrast. On the other hand, in other bilayers, which show obvious indirect band gap emission, the indirect optical transition process depletes the phonon mode at the K point dramatically and results in anomalously robust valley polarization in bilayer WS2. These results help recognize the crucial role of electron-phonon coupling in intervalley relaxation in bilayer WS2 and provide new insights into the future design of valleytronic devices based on two-dimensional TMDs. |
| WOS关键词 | INTERVALLEY SCATTERING ; MOLYBDENUM-DISULFIDE ; SPIN POLARIZATION ; MONOLAYER MOS2 ; TRANSITION ; PHOTOLUMINESCENCE ; COHERENCE ; SUBSTRATE ; EXCITONS ; STRAIN |
| 资助项目 | National Natural Science Foundation of China[61774040] ; National Natural Science Foundation of China[11774170] ; Ministry of Education (MOE) Tier 1[RG199/17] ; National Young 1000 Talent Plan of China ; Shanghai Municipal Natural Science Foundation[16ZR1402500] ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Shanghai Institute of Microsystem and Information Technology ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation[2018M631829] ; DICP ; Six Talent Peaks project in Jiangsu Province[51235079] ; 100 Foreign Talents Project in Jiangsu Province[51235228] |
| WOS研究方向 | Chemistry ; Science & Technology - Other Topics ; Materials Science |
| 语种 | 英语 |
| 出版者 | ROYAL SOC CHEMISTRY |
| WOS记录号 | WOS:000461558200024 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Education (MOE) Tier 1 ; Ministry of Education (MOE) Tier 1 ; National Young 1000 Talent Plan of China ; National Young 1000 Talent Plan of China ; Shanghai Municipal Natural Science Foundation ; Shanghai Municipal Natural Science Foundation ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Shanghai Institute of Microsystem and Information Technology ; Shanghai Institute of Microsystem and Information Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; DICP ; DICP ; Six Talent Peaks project in Jiangsu Province ; Six Talent Peaks project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Education (MOE) Tier 1 ; Ministry of Education (MOE) Tier 1 ; National Young 1000 Talent Plan of China ; National Young 1000 Talent Plan of China ; Shanghai Municipal Natural Science Foundation ; Shanghai Municipal Natural Science Foundation ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Shanghai Institute of Microsystem and Information Technology ; Shanghai Institute of Microsystem and Information Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; DICP ; DICP ; Six Talent Peaks project in Jiangsu Province ; Six Talent Peaks project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Education (MOE) Tier 1 ; Ministry of Education (MOE) Tier 1 ; National Young 1000 Talent Plan of China ; National Young 1000 Talent Plan of China ; Shanghai Municipal Natural Science Foundation ; Shanghai Municipal Natural Science Foundation ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Shanghai Institute of Microsystem and Information Technology ; Shanghai Institute of Microsystem and Information Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; DICP ; DICP ; Six Talent Peaks project in Jiangsu Province ; Six Talent Peaks project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Education (MOE) Tier 1 ; Ministry of Education (MOE) Tier 1 ; National Young 1000 Talent Plan of China ; National Young 1000 Talent Plan of China ; Shanghai Municipal Natural Science Foundation ; Shanghai Municipal Natural Science Foundation ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Opening project of the State Key Laboratory of Functional Materials for Informatics ; Shanghai Institute of Microsystem and Information Technology ; Shanghai Institute of Microsystem and Information Technology ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; DICP ; DICP ; Six Talent Peaks project in Jiangsu Province ; Six Talent Peaks project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province ; 100 Foreign Talents Project in Jiangsu Province |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/165766]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 通讯作者 | Cong, Chunxiao; Yu, Ting |
| 作者单位 | 1.Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, Key Lab Chem Lasers, Dalian 116023, Peoples R China 3.Nanjing Tech Univ NanjingTech, Inst Adv Mat IAM, Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China 4.Nanjing Tech Univ NanjingTech, Key Lab Flexible Elect KLOFE, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China 5.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore |
| 推荐引用方式 GB/T 7714 | Wang, Yanlong,Cong, Chunxiao,Shang, Jingzhi,et al. Unveiling exceptionally robust valley contrast in AA- and AB-stacked bilayer WS2[J]. NANOSCALE HORIZONS,2019,4(2):396-403. |
| APA | Wang, Yanlong.,Cong, Chunxiao.,Shang, Jingzhi.,Eginligil, Mustafa.,Jin, Yuqi.,...&Yu, Ting.(2019).Unveiling exceptionally robust valley contrast in AA- and AB-stacked bilayer WS2.NANOSCALE HORIZONS,4(2),396-403. |
| MLA | Wang, Yanlong,et al."Unveiling exceptionally robust valley contrast in AA- and AB-stacked bilayer WS2".NANOSCALE HORIZONS 4.2(2019):396-403. |
入库方式： OAI收割
来源：大连化学物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。