Article
Chemistry, Multidisciplinary
Zeng Wang, Matej Sebek, Xinan Liang, Ahmed Elbanna, Arash Nemati, Nan Zhang, Choon Hwa Ken Goh, Mengting Jiang, Jisheng Pan, Zexiang Shen, Xiaodi Su, Nguyen Thi Kim Thanh, Handong Sun, Jinghua Teng
Summary: Excitonic resonance in atomically thin semiconductors offers a platform for studying 2D nanophotonics and can potentially be used to develop highly tunable and ultra-compact optical devices. The understanding of charge density dependent exciton-trion conversion is crucial for revealing the underlying physics of optical tunability. However, insufficient and inefficient light-matter interactions have hindered the observation of trionic phenomenon and the development of excitonic devices for dynamic power-efficient electro-optical applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Thomas Sayer, Yusef R. Farah, Rachelle Austin, Justin Sambur, Amber T. Krummel, Andreis Montoya-Castillo
Summary: Monolayer transition-metal dichalcogenides (ML-TMDs) have the potential to unlock novel photonic and chemical technologies. However, there have been contradictory explanations for how TMD absorption spectra change with carrier concentration, fluence, and time. This study proposes that the broadening and shifting of the band-edge features in optical spectra are caused by the formation of negative trions. Experimental electrochemical data is used to fit an ab initio based, many-body model, providing a global description of the potential-dependent linear absorption data.
Article
Materials Science, Multidisciplinary
Tamaghna Chowdhury, Diptabrata Paul, Divya Nechiyil, M. A. Gokul, Kenji Watanabe, Takashi Taniguchi, G. V. Pavan Kumar, Atikur Rahman
Summary: The study systematically investigated the influence of surface defects on PL spectra by increasing the separation between WS2 monolayer and substrate, allowing precise modulation of exciton and trion contribution. Excitation power-dependent measurements on dielectric engineered and patterned substrates helped shed light on the mechanism of PL modulation in monolayer WS2.
Article
Nanoscience & Nanotechnology
Chuyuan Zheng, Yanli Zhang, Weili Zhang
Summary: Efficient manipulation of unidirectional edge states is crucial for the development of topological insulators. This study proposes an all-optical method to realize programmable topological insulators using the valley-selective optical Stark effect. By creating a two-dimensional honeycomb structure in a exciton-polariton platform, the optical Stark effect is induced to generate a pseudo magnetic field, leading to the formation of topological one-way edge states. By leveraging the ultrafast switching speed and precise spatial controllability of the optical Stark effect, two applications, namely ports ratio tunable polariton splitter and programmable polariton router, were demonstrated, showcasing the designable and rewritable functionality of all-optically controllable polariton topological insulators. This study opens up possibilities for robustly and intelligently controlling/forming polaritonic and spintronic devices for future classical and quantum information processing and application.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Guan-Yao Huang, Linhan Lin, Shuang Zhao, Wenbin Li, Xiaonan Deng, Simian Zhang, Chen Wang, Xiao-Ze Li, Yan Zhang, Hong -Hua Fang, Yixuan Zou, Peng Li, Benfeng Bai, Hong -Bo Sun, Tairan Fu
Summary: Excitons are quasi-particles composed of electron-hole pairs and play a crucial role in determining the optical properties of monolayer TMDs. Manipulating their charge states in a reversible manner remains challenging. By utilizing femtosecond-laser-driven atomic defect generation, electron transfer, and surface molecular desorption/adsorption, we have developed an all-optical approach to control the charge states of excitons in monolayer MoS2, enabling reconfigurable optical encoding.
Article
Chemistry, Multidisciplinary
Yan Zhang, Keisuke Shinokita, Kenji Watanabe, Takashi Taniguchi, Yuhei Miyauchi, Kazunari Matsuda
Summary: The study investigates the valley polarization dynamics of excitonic states in MoSe2 under strong magnetic field, attributing the induced valley polarizations to the asymmetric valley scattering of trions due to the valley Zeeman effect under magnetic field. The feeding of valley-polarized excitons for trions formation and longer inter-valley scattering time contribute to the larger valley polarization of trions than that of excitons in 1L-MoSe2.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yaroslav Zhumagulov, Alexei Vagov, Dmitry R. Gulevich, Vasili Perebeinos
Summary: Charged excitons or trions play a crucial role in the optical spectra of low-dimensional doped monolayers of TMDC. By diagonalizing the three-body Hamiltonian, the study investigates the low-lying trion states in four types of TMDC monolayers and explores the influence of doping and dielectric environment on their fine structure.
Article
Physics, Condensed Matter
Armando Genco, Chiara Trovatello, Charalambos Louca, Kenji Watanabe, Takashi Taniguchi, Alexander Tartakovskii, Giulio Cerullo, Stefano Dal Conte
Summary: This article investigates the ultrafast dynamics of neutral and charged excitons in high-quality hBN-encapsulated monolayer MoS2. The results show that neutral excitons have a narrow linewidth and fast recombination, while trions exhibit markedly different dynamics compared to neutral excitons. These results are important for exploring the ultrafast behavior of excitons and their many-body complexes in TMD heterostructures.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yue Hu, Xinglin Wen, Jiamin Lin, Wendian Yao, Yingying Chen, Junze Li, Sijie Chen, Lei Wang, Weigao Xu, Dehui Li
Summary: In this study, selective enhancement of singlet and triplet interlayer exciton (IX) emission was achieved by coupling WS2/WSe2 heterostructure to a SiO2 microsphere cavity. This all-optical approach allows for emission intensity enhancement and control of the emissive IX species at room temperature. Moreover, an all-optical valley polarization switch with a high on/off ratio of 35 was demonstrated.
Article
Chemistry, Multidisciplinary
Xuejing Wang, Michael Thompson Pettes, Yongqiang Wang, Jian-Xin Zhu, Rohan Dhall, Chengyu Song, Andrew C. Jones, Jim Ciston, Jinkyoung Yoo
Summary: Defect engineering with proton irradiation was used to enhance the exciton-to-trion conversion of atomically thin WS2. Scanning transmission electron microscopy, photoluminescence, and Raman spectroscopy confirmed the correlation between altered excitonic states and nanopore-induced atomic displacement, W nanoclusters, and zigzag edge terminations. Density functional theory calculation and ion energy loss simulation provided further evidence for band perturbations and nanopore formation without destroying the overall crystallinity. This study offers a new approach for tuning excitonic properties of van der Waals semiconductors using an irradiation-based defect engineering method.
Article
Chemistry, Multidisciplinary
Noemie Bonnet, Hae Yeon Lee, Fuhui Shao, Steffi Y. Woo, Jean-Denis Blazit, Kenji Watanabe, Takashi Taniguchi, Alberto Zobelli, Odile Stephan, Mathieu Kociak, Silvija Gradecak, Luiz H. G. Tizei
Summary: Nanometer-resolved optical properties of transition metal dichalcogenide monolayers have been obtained using electron spectroscopy at cryogenic temperatures, showing local modulation and emission changes. This is directly correlated to chemical and structural information, suggesting involvement of point defects in the formation of localized exciton emission.
Article
Chemistry, Multidisciplinary
Zeqian Ren, Qiwei Zhang, Xiu Li, Lixia Guo, Jizhou Wu, Yuqing Li, Wenliang Liu, Peng Li, Yongming Fu, Jie Ma
Summary: The spontaneous inversion of exciton state population is observed in monolayer MoS2 under changing pump light power. A semiclassical model is proposed to discuss the mechanism.
Article
Materials Science, Multidisciplinary
Weihao Zheng, Peng Fan, Danliang Zhang, Biyuang Zheng, Cuihuan Ge, Ying Chen, Boyi Xu, Zilan Tang, Jianwu Liu, Tian Zhang, Ying Jiang, Xiao Wang, Xiaoli Zhu, Shula Chen, Quan Yuan, Anlian Pan
Summary: In this study, WS2 monolayers with different defect populations (DPs) were fabricated by varying the fabrication methods, and distinct photoluminescence (PL) behaviors and exciton dynamics were observed. These findings provide valuable insights for the design and application of high-performance devices.
SCIENCE CHINA-MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Suman Chatterjee, Garima Gupta, Sarthak Das, Kenji Watanabe, Takashi Taniguchi, Kausik Majumdar
Summary: By tuning the spectral overlap in monolayer WS2, researchers observed an anomalous suppression of trion emission intensity with an increase in gate voltage. Time-resolved measurements indicated that this suppression is caused by nonradiative Auger recombination of a bright trion, providing direct evidence of nontrivial trion-trion annihilation. The Auger coefficient for the process was found to be tunable through spectral overlap tuning.
Article
Engineering, Electrical & Electronic
J. Nguepnang, C. Kenfack-Sadem, A. Kenfack-Jiotsa, C. Guimapi, A. J. Fotue, A. E. Merad
Summary: This paper theoretically investigates the effect of electron-phonon coupling on the dynamic and optical absorption of exciton-polaron in Transition Metal Dichalcogenides under a magnetic field. It is found that the absorption coefficient is influenced by the magnetic field, internal distance between TMDs monolayers and polar substrates, choice of polar substrates, and type of TMDs. Different characteristics are observed for weak, intermediate, and strong coupling regimes.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Physics, Applied
Ruixiang Wu, Ruiyun Chen, Haitao Zhou, Yaqiang Qin, Guofeng Zhang, Chengbing Qin, Yan Gao, Yajun Gao, Liantuan Xiao, Suotang Jia
APPLIED PHYSICS LETTERS
(2018)
Article
Materials Science, Multidisciplinary
Chengbing Qin, Zhixing Qiao, Wenjun He, Yani Gong, Guofeng Zhang, Ruiyun Chen, Yan Gao, Liantuan Xiao, Suotang Jia
JOURNAL OF MATERIALS CHEMISTRY C
(2018)
Article
Chemistry, Physical
Yao Li, Ruiyun Chen, Haitao Zhou, Ying Shi, Chengbing Qin, Yajun Gao, Guofeng Zhang, Yan Gao, Liantuan Xiao, Suotang Jia
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2018)
Article
Optics
Jianyong Hu, Mingyong Jing, Guofeng Zhang, Chengbing Qin, Liantuan Xiao, Suotang Jia
Article
Chemistry, Physical
Haitao Zhou, Chengbing Qin, Ruiyun Chen, Yaoming Liu, Wenjin Zhou, Guofeng Zhang, Yan Gao, Liantuan Xiao, Suotang Jia
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Chemistry, Physical
Zhixing Qiao, Chengbing Qin, Wenjun He, Yani Gong, Bin Li, Guofeng Zhang, Ruiyun Chen, Yan Gao, Liantuan Xiao, Suotang Jia
Article
Optics
Chengbing Qin, Xiaorong Zhang, Wenjun He, Guofeng Zhang, Ruiyun Chen, Yan Gao, Liantuan Xiao, Suotang Jia
Article
Chemistry, Physical
Haitao Zhou, Chengbing Qin, Ruiyun Chen, Wenjin Zhou, Guofeng Zhang, Yan Gao, Liantuan Xiao, Suotang Jia
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Physics, Applied
Bin Li, Ruiyun Chen, Chengbing Qin, Changgang Yang, Wenli Guo, Xue Han, Yan Gao, Guofeng Zhang, Liantuan Xiao, Suotang Jia
APPLIED PHYSICS EXPRESS
(2019)
Article
Optics
Shuangping Han, Christoph Boguschewski, Yan Gao, Liantuan Xiao, Jingyi Zhu, Paul H. M. van Loosdrecht
Article
Chemistry, Physical
Brener R. C. Vale, Etienne Socie, Andres Burgos-Caminal, Jefferson Bettini, Marco A. Schiavon, Jacques-E. Moser
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Physics, Multidisciplinary
Mingyong Jing, Ying Hu, Jie Ma, Hao Zhang, Linjie Zhang, Liantuan Xiao, Suotang Jia
Article
Chemistry, Multidisciplinary
Wenjun He, Chengbing Qin, Zhixing Qiao, Yani Gong, Xiaorong Zhang, Guofeng Zhang, Ruiyun Chen, Yan Gao, Liantuan Xiao, Suotang Jia
Article
Chemistry, Multidisciplinary
Xiaorong Zhang, Chengbing Qin, Yani Gong, Yunrui Song, Guofeng Zhang, Ruiyun Chen, Yan Gao, Liantuan Xiao, Suotang Jia