DICP OpenIR
Unveiling exceptionally robust valley contrast in AA- and AB-stacked bilayer WS2
Wang, Yanlong1,2; Cong, Chunxiao3; Shang, Jingzhi1; Eginligil, Mustafa4,5; Jin, Yuqi2; Li, Gang2; Chen, Yu1; Peimyoo, Namphung1; Yu, Ting1
Corresponding AuthorCong, Chunxiao(cxcong@fudan.edu.cn) ; Yu, Ting(yuting@ntu.edu.sg)
Source PublicationNANOSCALE HORIZONS
2019-03-01
ISSN2055-6756
DOI10.1039/c8nh00306h
Volume4Issue:2Pages:396-403
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS KeywordINTERVALLEY SCATTERING ; MOLYBDENUM-DISULFIDE ; SPIN POLARIZATION ; MONOLAYER MOS2 ; TRANSITION ; PHOTOLUMINESCENCE ; COHERENCE ; SUBSTRATE ; EXCITONS ; STRAIN
AbstractValleytronics 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.
Language英语
Funding OrganizationNational 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
WOS IDWOS:000461558200024
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/165767
Collection中国科学院大连化学物理研究所
Corresponding AuthorCong, Chunxiao; Yu, Ting
Affiliation1.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
2.Chinese Acad Sci, Dalian Inst Chem Phys, Key Lab Chem Lasers, Dalian 116023, Peoples R China
3.Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China
4.Nanjing Tech Univ NanjingTech, Key Lab Flexible Elect KLOFE, 30 South Puzhu Rd, Nanjing 211816, Jiangsu, Peoples R China
5.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
Recommended Citation
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.
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