Article
Materials Science, Multidisciplinary
Wanfu Shen, Zhaoyang Sun, Shuchun Huo, Chunguang Hu
Summary: The research reveals that the optical anisotropy of oxidized BP is less sensitive compared to its electrical conductivity, and the low coverage of the initial oxidized layer allows the optical properties to remain constant for days. As the oxidation layer grows and forms an effective layer, modulation of the total optical anisotropy through optical interference may result in increased or decreased optical anisotropy.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Jiwei Zhang, Jiazhen Dou, Mengmeng Zhang, Shuxia Qi, Jianlin Zhao
Summary: A compact polarization-resolved common-path digital holography method is proposed for measuring the polarization distribution of a light field dynamically with high temporal stability. Experimental results demonstrate the method's accuracy and stability, and its capability of measuring light fields with different sizes.
Article
Chemistry, Multidisciplinary
Antonio Rossi, Cameron Johnson, Jesse Balgley, John C. Thomas, Luca Francaviglia, Riccardo Dettori, Andreas K. Schmid, Kenji Watanabe, Takashi Taniguchi, Matthew Cothrine, David G. Mandrus, Chris Jozwiak, Aaron Bostwick, Erik A. Henriksen, Alexander Weber-Bargioni, Eli Rotenberg
Summary: We investigated the electronic properties of a graphene and a-ruthenium trichloride (a-RuCl3) heterostructure and observed massive charge transfer from graphene to a-RuCl3. This strong coupling between the two materials can lead to novel electronic phenomena. Understanding these properties is crucial for designing next generation low-power optoelectronic devices.
Article
Physics, Applied
Hayder A. Al-Atabi, Xiaotian Zhang, Shanmei He, Cheng Chen, Yulin Chen, Eli Rotenberg, James H. Edgar
Summary: This study aims to investigate the stoichiometry and electronic structure of scandium nitride (ScN) by growing ScN (100) single crystals under specific conditions and obtaining core level spectra data using X-ray photoelectron spectroscopy.
APPLIED PHYSICS LETTERS
(2022)
Review
Chemistry, Multidisciplinary
Yiwei Li, Qiang Wan, Nan Xu
Summary: The past decade has seen significant progress in 2D materials, particularly in the field of artificial moire superlattices. These superlattices exhibit a range of quantum phenomena beyond their constituent materials, thanks to their nontrivial electronic structures. Modern ARPES techniques allow for direct visualization of these electronic structures, providing valuable insights into the fundamental physics of moire superlattice systems and guiding the design of novel devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Gary Wan, Alex Croot, Neil A. Fox, Mattia Cattelan
Summary: This paper presents an alternative method based on thermalized photoelectrons for investigating the unoccupied electronic states emitted from crystal surfaces. The approach is demonstrated on diamond and copper, revealing the unoccupied state band structure and allowing for experimental determination of the transverse effective mass. This method offers a convenient path for interpreting angle-resolved photoemission data and extracting information about empty states.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Multidisciplinary
Zhengwang Cheng, Zhilong Hu, Shaojian Li, Xinguo Ma, Zhifeng Liu, Mei Wang, Jing He, Wei Zou, Fangsen Li, Zhiqiang Mao, Minghu Pan
Summary: The study investigates the band structure of the "square-net" topological material ZrGeS, revealing its unique electronic properties suitable for exploring Dirac-fermions related physics and applications of topological devising.
NEW JOURNAL OF PHYSICS
(2021)
Article
Engineering, Mechanical
Yingzhu Wang, Zuohua Li, Xupeng Zhu, Yunxuan Gong, Nanxi Liu, Quanxue Deng, Zhili Long, Jun Teng
Summary: Plane stress measurement is crucial for obtaining mechanical information of structural steel components. Traditional methods struggle to measure internal plane stress non-destructively. This study presents a theoretical and experimental method for measuring average plane stress on the cross-section of steel components using shear wave birefringence. A new form of plane stress-acoustic relation is derived, allowing successful plane stress separation. The phase difference of two groups of echoes is utilized to calculate effective phase velocity information, and Fourier-transform is employed to obtain echo phase spectra.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Jacob Pettine, Paolo Maioli, Fabrice Vallee, Natalia Del Fatti, David J. Nesbitt
Summary: We investigated the effects of nanoscale structure on the femtosecond dynamics of gold nanoparticles using time-, angle-, and energy-resolved photoemission spectroscopy. We found that nanoparticles as small as 10 nm serve as excellent platforms for studying intrinsic metal dynamics.
Article
Physics, Multidisciplinary
Shuaishuai Li, Taimin Miao, Chaohui Yin, Yinghao Li, Hongtao Yan, Yiwen Chen, Bo Liang, Hao Chen, Wenpei Zhu, Shenjin Zhang, Zhimin Wang, Fengfeng Zhang, Feng Yang, Qinjun Peng, Chengtian Lin, Hanqing Mao, Guodong Liu, Zuyan Xu, Lin Zhao, X. J. Zhou
Summary: In this study, spatially-resolved laser-based high-resolution angle resolved photoemission spectroscopy (ARPES) measurements were performed on the optimally-doped YBa2Cu3O7-delta (Y123) superconductor. For the first time, clear bulk electronic properties were observed in the region from the cleaved surface. The Fermi surface and band structures of Y123 were determined, and a nodeless superconducting gap consistent with the d+is gap form was identified.
Article
Materials Science, Multidisciplinary
M. Cattelan, C. J. Sayers, D. Wolverson, E. Carpene
Summary: Palladium diselenide (PdSe2) is an emerging 2D transition-metal dichalcogenide with tunable band gap. Experimental results show that the bulk state exhibits semiconducting properties and displays strong sensitivity to atomic arrangement and symmetry. These findings provide insight into the electronic configuration of PdSe2 and highlight additional capabilities of photoemission spectroscopy.
Article
Physics, Multidisciplinary
Xu-Chuan Wu, Shen Xu, Jian-Feng Zhang, Huan Ma, Kai Liu, Tian-Long Xia, Shan-Cai Wang
Summary: This paper investigates the magnetoresistance origin of single crystal CaAl4 with C2/m structure at low temperature, revealing unsaturated magnetoresistance of around 3000% at 2.5 K and 14 T as the fingerprints of XMR materials. The study uses a combination of ARPES and first-principles calculations to elaborate on the multiband features and anisotropic Fermi surfaces, explaining the discrepancies in the isotropic two-band model. Despite a structural phase transition from I4/mmm to C2/m, the subtle impact on the electronic structure is revealed through ARPES measurements, highlighting CaAl4 as a new reference material for exploring the XMR phenomena.
Article
Engineering, Multidisciplinary
Yoshihiro Aiura, Kenichi Ozawa, Makoto Minohara
Summary: This study developed a high-precision sample goniometer that can examine the electronic structure of materials via angle-resolved photoemission spectroscopy (ARPES). The goniometer can tilt and rotate the sample to detect all emitted photoelectrons and investigate the symmetry of the electronic structure. The measurements of different materials demonstrated the effectiveness of the goniometer.
Article
Chemistry, Multidisciplinary
Julian Maklar, Raul Stuehler, Maciej Dendzik, Tommaso Pincelli, Shuo Dong, Samuel Beaulieu, Alexander Neef, Gang Li, Martin Wolf, Ralph Ernstorfer, Ralph Claessen, Laurenz Rettig
Summary: In this study, the electron dynamics of the two-dimensional quantum spin Hall (QSH) candidate bismuthene were investigated using time- and angle-resolved photoemission spectroscopy. Shorter lifetimes of photocarriers in bismuthene compared to conventional semiconductors were observed, which can be attributed to the presence of topological in-gap states. This study marks a critical step toward optical control of QSH functionalities.
Article
Chemistry, Multidisciplinary
Wei Wen, Xu Duan, Bin Liu, Caiyun Hong, Zhen Song, Bing Lin, Pengxu Ran, Shi Liu, Zhi Ren, Rui-Hua He
Summary: In-situ cesium (Cs) dosing induces an evolution of the surface electronic structure of Sn4Sb3, leading to quantum confinement of electronic states near the surface. With increasing Cs dosage, Cs atoms deposit on the sample surface or intercalate underneath, accompanied by a gradual suppression of surface band splitting. The study also highlights the possibility of an unexpected dimensionality reduction in Sn4Sb3 caused by Cs intercalation at interstitial sites.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Engineering, Environmental
Yuxuan Yang, Tao Zhao, Ming-Hua Li, Xiaoxue Wu, Mingyue Han, Shih-Chi Yang, Qiaoling Xu, Lede Xian, Xiang Chi, Ning-Jiu Zhao, Hong Cui, Sihan Li, Jin-Song Hu, Bao Zhang, Yan Jiang
Summary: A nitrogen-donor crown ether is developed as a positive defect passivator in metal-halide perovskite solar cells, reducing the electron trap density and improving the build-in potential. The addition of a small amount of nitrogen-donor crown ether significantly enhances the efficiency and stability of the solar cells.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Ya Kong, Yuling Yin, Xueting Feng, Zixuan Zhang, Feng Ding, Lianming Tong, Jin Zhang
Summary: In this study, the negative thermal expansion (NTE) behavior of graphdiyne (GDY) was observed and studied. The research found that GDY exhibits negative thermal expansion with a negative thermal expansion coefficient (TEC) value. These findings provide important insights for the application of GDY in negative thermal expansion composite materials.
Article
Chemistry, Physical
Zongbao Li, Zeyuan Wu, Mingjie Feng, Xia Wang, Wenbo Lu, Bin Yan, Hui-Juan Yan, Jin-Song Hu, Ding-Jiang Xue
Summary: By evaluating the bond length and angle distortion metrics, we find that the stereoactivity of lone pairs plays a crucial role in the bonding composition of GeSe allotropes. The stronger stereoactivity of lone pairs, enabled by a larger contribution of Ge 4s and 4p states, results in enhanced bonding strength and more distorted bond angles, ultimately leading to increased stability of the phases.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Song Yu, Zenghua Cai, Deyan Sun, Yu-Ning Wu, Shiyou Chen
Summary: The defect types in layered semiconductors can be determined by comparing scanning transmission electron microscopy (STEM) images with first-principles simulations. The Mo-S2 antisite is found to be the dominant defect in PVD-grown MoS2 due to its matching structure in STEM images. However, MoS can also be mistaken for Mo-S2, as both have similar structural distortion and can be easily ionized under electron irradiation. The overlooked radiation-induced ionization and structural distortion of Mo-S highlight the necessity of considering these factors in STEM identification of defects in layered semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jinpeng Wu, Ming-Hua Li, Jiang-Tao Fan, Zongbao Li, Xin-Heng Fan, Ding -Jiang Xue, Jin-Song Hu
Summary: Passivation of defects in perovskite solar cells using organic halide salts, particularly chlorides, is an effective method for improving power conversion efficiencies. However, the incorporation of chloride ions into the perovskite lattice can degrade the photovoltaic performance. In this study, we replace ionic chloride salts with atomic-Cl-containing organic molecules, which both retain efficient passivation and prevent chloride incorporation. By optimizing the molecular configuration, the resulting perovskite solar cells achieve a certified power conversion efficiency of 25.02% and maintain 90% of their initial efficiency after 500 hours of continuous operation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Shao-Yu Yuan, Li -Wen Jiang, Jin-Song Hu, Hong Liu, Jian-Jun Wang
Summary: In this article, we report an effective strategy for implanting fully dispersed iridium-oxide atomic clusters onto hematite, which significantly improves the photoelectrochemical water oxidation in acidic solution. The resulting photoanode achieves a record-high photocurrent of 1.35 mA cm-2 at 1.23 V, demonstrating the merits of high atomic utilization of Ir.
Article
Chemistry, Physical
Junfang Wang, Chenglin Yang, Hao Chen, Mingsheng Lv, Tianhua Liu, Haining Chen, Ding-Jiang Xue, Jin-Song Hu, Liyuan Han, Shihe Yang, Xiangyue Meng
Summary: A crystal growth kinetic regime called oriented attachment (OA) has been discovered for tin halide perovskites (THPs), which allows the fabrication of high-quality THP films for optoelectronic devices. By tuning the surface energy using 2-phenoxyethylamine bromide (POEBr), highly oriented FASnI3-POEBr perovskite films are obtained. The OA growth kinetics reduces the crystal growth rate and enables the formation of dense, smooth, and oriented THP films, resulting in an impressive efficiency of over 14%.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Zhen-Hua Lyu, Jiaju Fu, Tang Tang, Jianan Zhang, Jin-Song Hu
Summary: In the past few decades, renewable-energy-driven fuel cell technologies have been widely investigated as promising approaches to alleviate the energy and environmental crisis caused by fossil fuel consumption. Similar to hydrogen, ammonia provides a potential solution due to its comparable energy density and carbon-free emissions. However, the sluggish kinetics of ammonia oxidation reaction significantly hindered the performance of low-temperature DAFCs, urgently demanding systematic guidance for designing high-efficiency electrocatalysts. In this review, we systematically summarized and discussed the recently reported strategies for developing high-performance AOR electrocatalysts, including size regulating, crystal facet engineering, morphology controlling, defect engineering, alloying, heterostructure constructing, and molecular engineering strategies. Finally, we propose perspectives and challenges for future AOR electrocatalyst development and high-performance DAFC construction. We hope this review could provide significant insights into fabricating active and stable AOR electrocatalysts for practical low-temperature DAFC.
Article
Chemistry, Multidisciplinary
Guoteng Ma, Wanfu Shen, Daniel Soy Sanchez, Yu Yu, Han Wang, Lidong Sun, Xinran Wang, Chunguang Hu
Summary: The universal existence of topologically protected phase singularities (PSs) generated from exciton resonances of single-atom layers is demonstrated. By coating TMDC monolayers on a transparent substrate, PSs with zero reflection and perfect Heaviside phase jump can be achieved, enabling highly sensitive biosensing capabilities.
Article
Chemistry, Physical
Fanrong Chen, Xiaoying Lu, Liang Ding, Zhen-Hua Lyu, Xiaoling Zhang, Jiaju Fu, Jin-Song Hu
Summary: In this study, a sub-5 nm sized CuInS2 quantum dots (CIS-QDs) based electrocatalyst for converting CO2 into CO is developed. The catalyst exhibits excellent structural stability, high CO Faradaic efficiency, long-term durability, and outstanding current densities. The excellent performance is attributed to the high-density active sites and fast charge transfer brought by the ultrasmall size of CIS-QDs.
Article
Nanoscience & Nanotechnology
Cong Zhai, Yujian Hong, Zuzeng Lin, Yulu Chen, Han Wang, Tong Guo, Chunguang Hu
Summary: Microspheres break the diffraction limit and magnify nano-structure imaging. Microsphere-assisted imaging is a cost-effective and label-free tool in life sciences and precision measurements. However, the small size and limited imaging field of solid microspheres pose challenges when imaging large samples. Droplets, on the other hand, have similar properties to microspheres and can serve as lenses for observation and imaging. A novel microdroplet-assisted imaging technology based on optical tweezers is proposed to better integrate the generation, manipulation, and utilization of droplets.
NANOTECHNOLOGY AND PRECISION ENGINEERING
(2023)
Article
Chemistry, Physical
Song Yu, Zenghua Cai, Deyan Sun, Yu-Ning Wu, Shiyou Chen
Summary: Defect types in layered semiconductors can be identified by matching STEM images with first-principles simulations. MoS2 antisite is dominant in PVD-grown MoS2 monolayer, and MoS may be mistaken as MoS2 due to similar structural distortion and ionization. Previous studies have overlooked the ionization and structural distortion of MoS. Considering defect ionization and associated structural distortion is necessary in STEM identification of defects in layered semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)