Article
Multidisciplinary Sciences
Shengru Chen, Qinghua Zhang, Xujing Li, Jiali Zhao, Shan Lin, Qiao Jin, Haitao Hong, Amanda Huon, Timothy Charlton, Qian Li, Wensheng Yan, Jiaou Wang, Chen Ge, Can Wang, Baotian Wang, Michael R. Fitzsimmons, Haizhong Guo, Lin Gu, Wen Yin, Kui-juan Jin, Er Jia Guo
Summary: In this study, a unit-thick syntactic layer of cobaltites was constructed within a strongly tilted octahedral matrix through atomically precise synthesis. The tilting patterns of the octahedral matrix propagated into the cobaltites and induced severe rumpling within neighboring layers, triggering electronic reconstruction and resulting in robust ferromagnetism. This work demonstrates a design methodology for fine-tuning lattice and spin degrees of freedom in correlated quantum heterostructures through epitaxial geometric engineering.
Article
Chemistry, Physical
Fabrizio Cossu, Heung-Sik Kim, Biplab Sanyal, Igor Di Marco
Summary: Using electronic structure calculations, we demonstrate that a (111)-oriented (LaMnO3)(12)/(SrMnO3)(6) superlattice maintains a half-metallic ferromagnetic character despite its large thickness, which is attributed to strain and octahedral connectivity between the layers. Interestingly, the maximum magnetization is observed inside the LaMnO3 region rather than at the interface, in contrast to the behavior observed for the (001) orientation. The inter-atomic exchange coupling suggests that the magnetic order arises from the double-exchange mechanism, despite competing interactions inside the SrMnO3 region.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Ming Zheng, Pengfei Guan, Yaping Qi, Zhenhua Tang, Hao Ni, Ju Gao
Summary: The research found that in La0.85Hf0.15MnO3/Pb(Mg1/3Nb2/3)O-3-PbTiO3 multiferroic heterostructures, charge ordering and electronic transport can be manipulated by piezo-strain and magnetic field through phase separation. Electrically induced lateral compressive piezo-strain can decrease film resistance, while magnetic field can reduce piezo-resistance effect.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Physics, Multidisciplinary
Xintong Li, Yuchen Gu, Yue Chen, V. Ovidiu Garlea, Kazuki Iida, Kazuya Kamazawa, Yangmu Li, Guochu Deng, Qian Xiao, Xiquan Zheng, Zirong Ye, Yingying Peng, I. A. Zaliznyak, J. M. Tranquada, Yuan Li
Summary: We present magnetometry data on twin-free single crystals of Na3Co2SbO6, a candidate material for realizing the Kitaev honeycomb model for quantum spin liquids. Contrary to the belief that such materials can be modeled with the symmetries of an ideal honeycomb lattice, our data show a pronounced twofold symmetry and in-plane anisotropy of over 200%, despite the small orthorhombic distortion of the honeycomb layer. Magnetic neutron diffraction is used to study the field-induced phases observed in the magnetometry, which manifest as diffuse scattering signals in the paramagnetic state and are consistent with a theory predicting a nearby quantum spin liquid phase. These findings call for a theoretical understanding of the observed in-plane anisotropy and make Na3Co2SbO6 a promising candidate for studying exotic quantum phases through targeted external tuning.
Article
Chemistry, Physical
Gian Marco Pierantozzi, Giovanni Vinai, Aleksandr Yu Petrov, Alessandro De Vita, Federico Motti, Vincent Polewczyk, Debashis Mondal, Tommaso Pincelli, Riccardo Cucini, Chiara Bigi, Ivana Vobornik, Jun Fujii, Piero Torelli, Francesco Offi, Giorgio Rossi, Giancarlo Panaccione, Francesco Borgatti
Summary: In this study, the relationship between ferromagnetism and metallicity in strained La0.67Ca0.33MnO3 films was investigated. It was found that the half-metallicity of the ferromagnetic metallic (FMM) phase is correlated with spin polarization and occupancy at the Fermi level. These results suggest that the half-metallic behavior predicted by a double-exchange model persists even in phase-separated manganites.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Brajagopal Das, Lena Wysocki, Joerg Schoepf, Lin Yang, Amir Capua, Paul H. M. van Loosdrecht, Lior Kornblum
Summary: This study demonstrates the coexistence of tilted magnetic anisotropy and anisotropic in-plane magnetization in Ru-substituted La0.7Sr0.3MnO3 films, which is attractive for spin-orbit torque (SOT) based devices and other spintronic applications.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Yuxuan Sun, Ziang Liu, Zeya Li, Feng Qin, Junwei Huang, Caiyu Qiu, Hongtao Yuan
Summary: Layered trihalides, such as MoCl3, exhibit strong crystal anisotropy and tunable phonon frequencies under strain engineering. This study demonstrates the anisotropy of MoCl3 through polarized Raman spectroscopy and shows that the phonon frequencies decrease with uniaxial tensile strain along the axis of symmetry and increase with strain applied perpendicularly. These findings shed light on the manipulation of anisotropic light-matter interactions via strain engineering.
Article
Materials Science, Multidisciplinary
Bin Wei, Junyan Liu, Qingan Cai, Ahmet Alatas, Ayman H. Said, Meihua Hu, Chen Li, Jiawang Hong
Summary: An exceptional case of thermal conductivity anisotropy in layered pentagonal PdSe2 is reported. The thermal conductivity along the b-axis is surprisingly much greater than along the a-axis. The high anisotropy is attributed to the low-energy phonons along the a-axis and the different buckling structures between the a-axis and the b-axis.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Polina M. Sheverdyaeva, Conor Hogan, Gustav Bihlmayer, Jun Fujii, Ivana Vobornik, Matteo Jugovac, Asish K. Kundu, Sandra Gardonio, Zipporah Rini Benher, Giovanni Di Santo, Sara Gonzalez, Luca Petaccia, Carlo Carbone, Paolo Moras
Summary: Topological insulators are bulk insulators with metallic and fully spin-polarized surface states exhibiting Dirac-like band dispersion. By using spin-resolved photoemission spectroscopy, we show that the topological surface states of a topological insulator interfaced with an antimonene bilayer exhibit nearly full out-of-plane spin polarization within the substrate gap. This phenomenon is connected to a symmetry-protected band crossing of the spin-polarized surface states. The nearly full out-of-plane spin polarization of the topological surface states occurs along a continuous path in the energy-momentum space, and the spin polarization within the gap can be reversibly tuned from nearly full out-of-plane to nearly full in-plane by electron doping. These findings pave the way for advanced spintronics applications that exploit the giant out-of-plane spin polarization of topological surface states.
Article
Engineering, Electrical & Electronic
Nicola Manca, Teruo Kanki, Fumiya Endo, Enrico Ragucci, Luca Pellegrino, Daniele Marre
Summary: VO2 is a promising material for solid-state micro- and nanoactuators due to its phase transition properties. The crystalline microstructure of VO2 affects the strain dynamics and anisotropy of devices, while mechanical degrees of freedom also impact the transport properties in VO2 micromechanical systems.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Joscha Nehrkorn, Samuel M. Greer, Brian J. Malbrecht, Kevin J. Anderton, Azar Aliabadi, J. Krzystek, Alexander Schnegg, Karsten Holldack, Carmen Herrmann, Theodore A. Betley, Stefan Stoll, Stephen Hill
Summary: This study presents a comprehensive spectroscopic investigation of the unique single-molecule magnet Fe-6, revealing its isolated nature of the spin ground state and providing insights into the factors governing the quantum tunneling of its magnetization. The work suggests strategies for improving the performance of polynuclear SMMs featuring direct metal-metal bonds and strong ferromagnetic spin-spin interactions.
INORGANIC CHEMISTRY
(2021)
Article
Engineering, Chemical
Sergei Alexandrov, Marina Rynkovskaya, Yeong-Maw Hwang
Summary: This paper focuses on the design of plane-strain bending of wide sheets based on ideal flow theory to control the loading path and achieve the desired sheet shape. The method combines rigid plastic and elastic solutions, resulting in a practically analytical design solution.
Article
Multidisciplinary Sciences
Sergei Alexandrov, Elena Lyamina, Yeong-Maw Hwang
Summary: The paper presents a new semi-analytic solution for the finite plane strain pure bending of orthotropic sheets with inhomogeneous distributions of plastic properties. The solution utilizes a symmetry simplification approach and is shown to be practically applicable for large strains, based on experimental data. The results demonstrate that the difference between the elastic/plastic and rigid/plastic solutions is negligible, with the latter being much simpler and recommended for practical use.
Article
Physics, Multidisciplinary
J. Khatua, M. Gomilsek, J. C. Orain, A. M. Strydom, Z. Jaglicic, C. Colin, S. Petit, A. Ozarowski, L. Mangin-Thro, K. Sethupathi, M. S. Ramachandra Rao, A. Zorko, P. Khuntia
Summary: Researchers experimentally investigate a frustrated magnet, Li4CuTeO6, and provide evidence suggesting the presence of a random-singlet ground state in this material.
COMMUNICATIONS PHYSICS
(2022)
Article
Mathematics, Applied
Yaping Wang, Xiaoliu Wang
Summary: In this article, the evolution of immersed locally convex plane curves driven by anisotropic flow is studied. The results show that the flow exists globally and converges fully in certain parameter ranges. For other parameter values, only specific types of singularities arise in the flow and the convergence is subsequential.
ADVANCES IN NONLINEAR ANALYSIS
(2023)
Review
Chemistry, Multidisciplinary
Chun-Ho Lin, Long Hu, Xinwei Guan, Jiyun Kim, Chien-Yu Huang, Jing-Kai Huang, Simrjit Singh, Tom Wu
Summary: This article provides a critical review on the elusive nature of perovskite/electrode interfaces, focusing on the interfacial electrochemistry effects. It discusses the basic guidelines for electrode selection to establish non-polarized interfaces and optimize energy level alignment for perovskite materials. Furthermore, state-of-the-art strategies on interface-related electrode engineering are reviewed and discussed, aiming to achieve ohmic transport and eliminate hysteresis in perovskite devices. The role and multiple functionalities of self-assembled monolayers in improving perovskite/electrode contacts are also discussed.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Xingyu Qu, He Huang, Tao Wan, Long Hu, Zhenlu Yu, Yunjian Liu, Aichun Dou, Yu Zhou, Mingru Su, Xiaoqi Peng, Hong-Hui Wu, Tom Wu, Dewei Chu
Summary: An integrated surface coating/doping strategy has been developed to improve the structural stability and electrochemical performance of high-nickel layered oxides, leading to enhanced cycling stability and capacity retention of batteries. The strategy involves diffusion of titanium ions from a thin coating layer, formation of a protective layer on the material surface, and Ti4+ doping to enhance lithium ion diffusion and reduce side reactions, ultimately benefiting the cycling stability of the cathode.
Article
Nanoscience & Nanotechnology
Biaohong Huang, Zhongshuai Xie, Dingshuai Feng, Lingli Li, Xiaoqi Li, Tula R. Paudel, Zheng Han, Weijin Hu, Guoliang Yuan, Tom Wu, Zhidong Zhang
Summary: By judiciously controlling the defect states of oxygen vacancy through Sm-doping, multiple current jumps and discrete resistance states can be obtained in ferroelectric resistive switching memories. Oxygen vacancies play a critical role in electron trapping and as pinning centers for ferroelectric domains, leading to domain wall creep behavior.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Long Hu, Leiping Duan, Yuchen Yao, Weijian Chen, Zizhen Zhou, Claudio Cazorla, Chun-Ho Lin, Xinwei Guan, Xun Geng, Fei Wang, Tao Wan, Shuying Wu, Soshan Cheong, Richard D. Tilley, Shanqin Liu, Jianyu Yuan, Dewei Chu, Tom Wu, Shujuan Huang
Summary: A universal method using halide perovskite quantum dots to improve the performance and stability of polycrystalline perovskite films is proposed in this work. The treated films show suppressed light-induced phase segregation and degradation, with significantly improved efficiency.
Article
Energy & Fuels
Hongling Guo, Rutao Meng, Long Hu, Chun-Ho Lin, Yali Sun, Yue Liu, Jianyu Wu, Zhan Shen, Dewei Chu, Gang Wang, Li Wu, Guangxing Liang, Shifu Xiong, Fangfang Liu, Yi Zhang, Tom Wu
Summary: The study demonstrates an effective strategy of accurately adjusting the Sn content in CZTSSe films by optimizing the selenization pressure, with negative pressure of 0.7 atm showing the best results. The research paves the way towards highly efficient kesterite solar cells by tailoring composition-dependent defects.
Article
Nanoscience & Nanotechnology
Xun Geng, Tianci Chang, Jiaxin Fan, Yu Wang, Xiaotian Wang, Yunlong Sun, Premkumar Selvarajan, Chuang Liu, Chun-Ho Lin, Xiaolin Wang, Jack Yang, Zhenxiang Cheng, Kourosh Kalantar-Zadeh, Xun Cao, Danyang Wang, Ajayan Vinu, Jiabao Yi, Tom Wu
Summary: Cobalt-doped VO2 thin films were successfully fabricated in this study, with the highest doping concentration reducing the transition temperature of VO2 and increasing the luminous transmittance. Experimental and modeling analysis provided a comprehensive explanation of the effects of cobalt doping on VO2 properties, highlighting the promising future of cobalt-doped VO2 in smart window applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Environmental
Yingze Zhou, Zizhen Zhou, Long Hu, Ruoming Tian, Yuan Wang, Hamid Arandiyan, Fandi Chen, Mengyao Li, Tao Wan, Zhaojun Han, Zhipeng Ma, Xunyu Lu, Claudio Cazorla, Tom Wu, Dewei Chu
Summary: This study presents a hydrothermal method for synthesizing MnO2 electrocatalysts with optimized structural and electrochemical properties. By adjusting the hydrothermal time, the phase transition from polymorphic 8 to alpha-MnO2 can be induced. The alpha-MnO2 polymorph with oxygen vacancies shows better band-alignment tunability, leading to improved electrochemical performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Jing-Kai Huang, Yi Wan, Junjie Shi, Ji Zhang, Zeheng Wang, Wenxuan Wang, Ni Yang, Yang Liu, Chun-Ho Lin, Xinwei Guan, Long Hu, Zi-Liang Yang, Bo-Chao Huang, Ya-Ping Chiu, Jack Yang, Vincent Tung, Danyang Wang, Kourosh Kalantar-Zadeh, Tom Wu, Xiaotao Zu, Liang Qiao, Lain-Jong Li, Sean Li
Summary: The scaling of silicon metal-oxide-semiconductor field-effect transistors has been successful, but with the thinning of silicon at smaller technology nodes, new challenges arise. In this study, researchers explore the use of ultrahigh-kappa single-crystalline perovskite strontium-titanium-oxide membranes as gate dielectrics for 2D field-effect transistors. These membranes have desirable properties and can mitigate the issues related to using ultrahigh-kappa dielectrics.
Article
Chemistry, Multidisciplinary
Shamim Shahrokhi, Milos Dubajic, Zhi-Zhan Dai, Saroj Bhattacharyya, Richard A. Mole, Kirrily C. Rule, Mohan Bhadbhade, Ruoming Tian, Nursultan Mussakhanuly, Xinwei Guan, Yuewei Yin, Michael P. Nielsen, Long Hu, Chun-Ho Lin, Shery L. Y. Chang, Danyang Wang, Irina V. Kabakova, Gavin Conibeer, Stephen Bremner, Xiao-Guang Li, Claudio Cazorla, Tom Wu
Summary: This study reveals that phase transitions in mixed-halide hybrid perovskite crystals can be substantially suppressed through material engineering. The research also sheds light on the complex structural evolution of these materials and its correlation with the properties of organic cations and optical phonons.
Article
Chemistry, Physical
Junjun Guo, Jianguo Sun, Long Hu, Shiwen Fang, Xufeng Ling, Xuliang Zhang, Yao Wang, Hehe Huang, Chenxu Han, Claudio Cazorla, Yingguo Yang, Dewei Chu, Tom Wu, Jianyu Yuan, Wanli Ma
Summary: In this study, the natural organic dye Indigo is found to be an efficient molecular passivator for improving the stability and crystallization of hybrid perovskite films. The Indigo molecule with bifunctional chemical passivation can enhance the morphology and reduce defects of the perovskite film, resulting in higher device efficiency and stability.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jianguo Sun, Bin Li, Long Hu, Junjun Guo, Xufeng Ling, Xuliang Zhang, Chi Zhang, Xianxin Wu, Hehe Huang, Chenxu Han, Xinfeng Liu, Youyong Li, Shujuan Huang, Tom Wu, Jianyu Yuan, Wanli Ma
Summary: Solution processable semiconductors like organics and emerging lead halide perovskites (LHPs) are ideal candidates for photovoltaics. This study investigates a novel device architecture involving block copolymer/perovskite hybrid bulk heterointerfaces, which enhances light absorption, energy level cascade, and provides a thin hydrophobic layer to improve carrier generation and prevent moisture invasion. The resulting hybrid solar cell exhibits high efficiency and stability, and the approach can be extended to other LHPs.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Uma V. Ghorpade, Mahesh P. Suryawanshi, Martin A. Green, Tom Wu, Xiaojing Hao, Kevin M. Ryan
Summary: This review provides an overview of the development of versatile chalcohalide materials, focusing on their design, synthesis, optoelectronic properties, and applications in energy conversion and storage devices. Computational techniques, theoretical and experimental approaches are employed to understand the band structures, stability, and structural chemistry of these materials. The review also discusses the challenges and future research directions in this field.
Article
Nanoscience & Nanotechnology
Xingjie Lv, Guoliang Yuan, Tom Wu, Zhibo Yan, Ben Xu, Guanghua Liu, Jun-Ming Liu
Summary: This study investigates the four different lifetimes of photocarriers in MAPbI(3) single crystal, shedding light on the physical mechanisms and facilitating the design of novel electronics with halide perovskite semiconductors.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Multidisciplinary Sciences
Weili Yu, Feng Li, Tao Huang, Wei Li, Tom Wu
Summary: Halide perovskite heterojunctions combine the properties of multi-dimensional perovskites and selected semiconductors, surpassing the limitations of a single component. This platform allows for material property tuning, discovery of interesting phenomena, and enables novel applications.
Review
Materials Science, Multidisciplinary
Dawei Duan, Chuangye Ge, Md Zahidur Rahaman, Chun-Ho Lin, Yumeng Shi, Haoran Lin, Hanlin Hu, Tom Wu
Summary: Metal halide perovskites are easy to synthesize and have tunable physical properties and excellent performance, making them important optoelectronic materials. One-dimensional (1D) nanostructures at both the morphological and molecular levels enhance the performance of optoelectronic devices. Recent progress in the synthesis and characterization of 1D halide perovskites with tunable structures, compositions, and properties, as well as their applications in photovoltaics, light emission, and photodetection, is highlighted. Current challenges, future prospects, and promising research directions are discussed to advance the field of 1D perovskites.
NPG ASIA MATERIALS
(2023)
