Article
Chemistry, Multidisciplinary
Nirjhar Bhattacharjee, Krishnamurthy Mahalingam, Adrian Fedorko, Valeria Lauter, Matthew Matzelle, Bahadur Singh, Alexander Grutter, Alexandria Will-Cole, Michael Page, Michael McConney, Robert Markiewicz, Arun Bansil, Don Heiman, Nian Xiang Sun
Summary: Breaking time-reversal symmetry by introducing magnetic order creates a novel topological antiferromagnetic phase. The results of this study provide a pathway towards industrial heterostructures for topological quantum devices.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mengying Bian, Liang Zhu, Xiao Wang, Junho Choi, Rajesh Chopdekar, Sichen Wei, Lishu Wu, Chang Huai, Austin Marga, Qishuo Yang, Yuguang C. Li, Fei Yao, Ting Yu, Scott A. Crooker, Xuemei M. Cheng, Renat F. Sabirianov, Shengbai Zhang, Junhao Lin, Yanglong Hou, Hao Zeng
Summary: Realizing van der Waals (vdW) epitaxy provides a breakthrough in circumventing the stringent lattice matching and processing compatibility requirements in conventional covalent heteroepitaxy. This study reports the epitaxial growth of covalent Cr5Te8 2D crystals on vdW WSe2, driven by interfacial dative bond formation. The concept of dative epitaxy is established, which combines the advantages of covalent epitaxy and vdW epitaxy while overcoming their limitations.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Cuihuan Ge, Danliang Zhang, Feiping Xiao, Haipeng Zhao, Mai He, Lanyu Huang, Shijin Hou, Qingjun Tong, Anlian Pan, Xiao Wang
Summary: Transition metal dichalcogenide heterobilayers exhibit strong moire potentials that can trap interlayer excitons at different locations within one moire unit cell. In this study, high-temperature interlayer excitons trapped at separate moire locales in WS2/WSe2 heterobilayers are observed and modulated. The emission of these excitons can be controlled through engineering the heterointerface with different phonon scattering and the emission energy can be further modulated via strain engineering. These highly tunable interlayer excitons provide valuable insights into moire-exciton physics and have potential applications in high-temperature excitonic devices.
Article
Chemistry, Multidisciplinary
Matteo Salvato, Maurizio De Crescenzi, Mattia Scagliotti, Paola Castrucci, Simona Boninel, Giuseppe Mario Caruso, Yi Liu, Anders Mikkelsen, Rainer Timm, Suhas Nahas, Annica Black-Schaffer, Gunta Kunakova, Jana Andzane, Donats Erts, Thilo Bauch, Floriana Lombardi
Summary: One-dimensional moire stripes are discovered and investigated on the surface of three-dimensional topological insulator thin films and nanobelts. The local density of states in the stripes is found to be strongly enhanced compared to the bulk system. This enhanced density can promote strong correlations in the topological surface states, potentially leading to surface magnetism and topological superconductivity.
Article
Multidisciplinary Sciences
Long Zhang, Fengcheng Wu, Shaocong Hou, Zhe Zhang, Yu-Hsun Chou, Kenji Watanabe, Takashi Taniguchi, Stephen R. Forrest, Hui Deng
Summary: Controlling matter-light interactions with cavities is crucial in modern science and technology. By integrating MoSe2-WS2 heterobilayers in a microcavity, cooperative coupling between moire-lattice excitons and microcavity photons has been established, providing versatile control of both matter and light. This moire polariton system combines strong nonlinearity and microscopic-scale tuning of matter excitations, offering a platform to study collective phenomena from tunable arrays of quantum emitters.
Article
Chemistry, Multidisciplinary
Xiaoqian Zhang, Siddhesh C. Ambhire, Qiangsheng Lu, Wei Niu, Jacob Cook, Jidong Samuel Jiang, Deshun Hong, Laith Alahmed, Liang He, Rong Zhang, Yongbing Xu, Steven S-L Zhang, Peng Li, Guang Bian
Summary: The discovery of interfacial topological Hall effect provides a platform to explore physics between topology and magnetism. By observing a giant THE signal in CrTe2/Bi2Te3 van der Waals heterostructures, it is attributed to an optimized combination of 2D ferromagnetism in CrTe2, strong SOC in Bi2Te3, and an atomically sharp interface. This finding suggests a convenient platform for achieving large interfacial THE in hybrid systems, which could be utilized for quantum science and information storage devices.
Article
Materials Science, Multidisciplinary
Andrey Chaves, Lucian Covaci, Francois M. Peeters, Milorad Milosevic
Summary: In a twisted van der Waals heterostructure, a twin boundary separates regions with nearly opposite inter-layer twist angles. In a MoS2/WSe2 bilayer, topologically protected chiral moire exciton states are confined at the twist boundary, which are one-dimensional and uni-directional excitons composed of electronic states with opposite valley/spin character, enabling intrinsic, guided, and far-reaching valley-polarized exciton currents.
Review
Chemistry, Multidisciplinary
Yanping Liu, Cheng Zeng, Juan Yu, Jiahong Zhong, Bo Li, Zhengwei Zhang, Zongwen Liu, Zhiming M. Wang, Anlian Pan, Xidong Duan
Summary: Recent advances in moire superlattices and moire excitons have attracted attention in optoelectronics and materials research. However, lagging theoretical development and inefficient processing technologies limit their potential applications. Continued research is likely to lead to breakthroughs and innovations in solid-state physics and materials science.
CHEMICAL SOCIETY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Gaojie Zhang, Hao Wu, Liang Zhang, Li Yang, Yuanmiao Xie, Fei Guo, Hongda Li, Boran Tao, Guofu Wang, Wenfeng Zhang, Haixin Chang
Summary: This review focuses on the preparation, properties, and device applications of 2D van der Waals topological materials (TMs). The authors summarize three common preparation strategies, discuss the origin and regulation of various properties of 2D vdW TMs, and present some device applications. They also briefly address the challenges and opportunities for the practical application of these materials in 2D topological electronics.
Review
Materials Science, Multidisciplinary
Su Kong Chong, Vikram V. Deshpande
Summary: This review summarizes the research progress on three-dimensional topological insulators, including surface states, topological phase transitions, and heterostructures with other materials. Experimental evidences and coupling effects of the topological surface states in intrinsic 3D TIs are discussed, while the focus is on magnetotransport activities and explanations of the proximity-induced topological and quantum effects in related heterostructures.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Vishakha Gupta, Rakshit Jain, Yafei Ren, Xiyue S. Zhang, Husain F. Alnaser, Amit Vashist, Vikram V. Deshpande, David A. Muller, Di Xiao, Taylor D. Sparks, Daniel C. Ralph
Summary: The advantages of mechanically stacked samples of van der Waals materials for controlling the surface state of a three-dimensional topological insulator are demonstrated. The interaction between the topological surface state and an adjacent magnet layer can be controlled, resulting in an observed anomalous Hall effect.
Article
Chemistry, Multidisciplinary
Sihan Zhao, Ryo Kitaura, Pilkyung Moon, Mikito Koshino, Feng Wang
Summary: This review summarizes experimental observations and theoretical perspectives related to interlayer interactions in 1D vdW moire superlattices, focusing on the unique optical features and physics in 1D DWNTs arising from the non-trivial strong interlayer coupling effect. Proposed and discussed are future directions and questions in probing the intriguing physical phenomena in 1D vdW moire superlattices, including correlated physics in different 1D moire systems beyond DWNTs.
Article
Chemistry, Multidisciplinary
Andres E. Llacsahuanga Allcca, Xing-Chen Pan, Ireneusz Miotkowski, Katsumi Tanigaki, Yong P. Chen
Summary: The study demonstrates that magnetism can be introduced into topological insulators by using the magnetic proximity effect with van der Waals materials. The anomalous Hall effect was observed in these heterostructures, and the effect can be modulated by controlling the carrier density with electrostatic gating.
Article
Chemistry, Multidisciplinary
Yoon Seong Heo, Tae Wan Kim, Wooseok Lee, Jungseok Choi, Soyeon Park, Dong-Il Yeom, Jae-Ung Lee
Summary: Investigations on mesoscopic-scale stacking reconfigurations and their correlations with mechanical distortions are conducted in stacked van der Waals films. It is found that the distortions come from the transfer process or the extended impact of atomic reconstructions. Grain boundaries have a limited effect, while cracks cause inhomogeneous strain in stacked polycrystalline films.
Article
Chemistry, Multidisciplinary
Jingfeng Li, Mahdi Ghorbani-Asl, Kinga Lasek, Vimukthi Pathirage, Arkady V. Krasheninnikov, Matthias Batzill
Summary: By locally modulating the interlayer atom coordination in the van der Waals heterostructure of PtSe2/PtTe2, a nanoscale electronic structure texture can be introduced in PtSe2. The interaction between PtSe2 and PtTe2 reduces the band gap of PtSe2. Density functional theory calculations indicate that variations in atom coordination in the moire unit cell cause differences in charge transfer and interface dipole.
Article
Chemistry, Multidisciplinary
Yingying Wu, Wei Wang, Lei Pan, Kang L. Wang
Summary: In this study, an exchange bias of approximately 90 mT in a van der Waals ferromagnet encapsulated by two antiferromagnets at 5 K is reported. The value of this exchange bias can be highly tunable by field coolings, paving the way for designing and controlling 2D spintronic devices made of atomically thin van der Waals magnets.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Ceramics
Hongfang Fan, Hualei Shi, Shuo Yao, Lin Wang, Jianqiang Wang, Mingjuan Han
Summary: In this study, organic-silica hybrid particles with inherent UV absorption were synthesized, and a BP-3@P2-HTESC composite material with dual sun protection functions was constructed. The composite material exhibited good UV absorption, excellent thermoresistance, and controlled release properties.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Huifang Ma, Qi Qian, Biao Qin, Zhong Wan, Ruixia Wu, Bei Zhao, Hongmei Zhang, Zucheng Zhang, Jia Li, Zhengwei Zhang, Bo Li, Lin Wang, Xidong Duan
Summary: The thickness of PtSe2 nanosheets significantly influences their electronic and magnetotransport properties. Thinner PtSe2 nanosheets exhibit semiconductor behavior, while thicker nanosheets show metallic behavior. Additionally, Raman spectroscopic and magnetoresistance studies reveal thickness-dependent Kondo effect in this material system.
Article
Materials Science, Multidisciplinary
Lian Ji, Yingyu Fang, Zhengchun Cheng, You Liu, Jungan Wang, Zihao Li, Yuchi Qian, Fang Liu, Wenxin Xu, Zichao Wu, Fangfang Wang, Aifei Wang, Lin Wang, Yi Di, Wei Huang, Tianshi Qin
Summary: The ball-milling pretreated single-source vapor deposition strategy enables the fabrication of a pure-phase CsPbCl3 perovskite film for high-performance self-driven UVPDs, resulting in ultrafast response time and outstanding detection properties.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Yuwei Zhao, Jing Li, Jianglu Xiang, Rong Wu, Chongguang Lyu, Huifang Ma, Xuefen Song, Junran Zhang, Lin Wang, Chenyang Zha
Summary: This study presents a single-atom tailoring strategy to design a liquid Li2S2 electrolyte, achieving a low activation voltage and excellent cycling stability, effectively addressing the safety concern and polysulfide migration issue in lithium-sulfur batteries.
MATERIALS TODAY ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Yingying Wu, Brian Francisco, Zhijie Chen, Wei Wang, Yu Zhang, Caihua Wan, Xiufeng Han, Hang Chi, Yasen Hou, Alessandro Lodesani, Gen Yin, Kai Liu, Yong-tao Cui, Kang L. Wang, Jagadeesh S. Moodera
Summary: Introducing magnetic skyrmions into two-dimensional van der Waals magnets provides additional degrees of freedom for skyrmion-based ultrahigh-density spin memory devices, leading to intriguing new properties and enhanced functionality. In this work, a van der Waals interface formed by two 2D ferromagnets is reported, where two groups of magnetic skyrmions are observed.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Ceramics
Chongguang Lyu, Yuchi Qian, Guixiang Zhan, Jiaxiao Yuan, Kaiyue He, Huihua Min, Chang Liu, Yang Cao, Xuefen Song, Huifang Ma, Yunfei Liu, Lin Wang
Summary: Rare earth doping strategy is employed to tune the performance of read-only memories based on lead-free double perovskite films. The doped films exhibit a low onset voltage, long retention time, and high ON/OFF ratio compared to the undoped films. This study provides new insights for the design and manipulation of memory devices based on lead-free halide perovskite materials.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Guixiang Zhan, Junran Zhang, Linghai Zhang, Zhenwei Ou, Hongyu Yang, Yuchi Qian, Xu Zhang, Ziyue Xing, Le Zhang, Congzhou Li, Jingxian Zhong, Jiaxiao Yuan, Yang Cao, Dawei Zhou, Xiaolong Chen, Huifang Ma, Xuefen Song, Chenyang Zha, Xiao Huang, Jianpu Wang, Ti Wang, Wei Huang, Lin Wang
Summary: Researchers have developed a simple, general, and efficient method to stimulate circularly polarized light (CPL) activity in achiral perovskites. By forming van der Waals heterojunctions between chiral and achiral perovskites, spin-polarized electrons from chiral perovskites are received by achiral perovskites, resulting in nonequilibrium spin distribution and CPL activity. The polarization degree of CPL in achiral perovskites is at least one order of magnitude higher than in chiral perovskites and can be flexibly designed by tuning chemical compositions, operating temperature, or excitation wavelengths.
Article
Nanoscience & Nanotechnology
Quanjun Pan, Yuting Liu, Hao Wu, Peng Zhang, Hanshen Huang, Christopher Eckberg, Xiaoyu Che, Yingying Wu, Bingqian Dai, Qiming Shao, Kang L. Wang
Summary: The research demonstrates a method to achieve efficient current-induced magnetization switching at room temperature, and shows that the energy efficiency of topological insulators is at least an order of magnitude larger than those found in heavy metals. Successful high-quality integration of perpendicularly magnetized CoFeB/MgO system with topological insulators is achieved through the use of a Mo insertion layer.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Jiadong Zhou, Chao Zhu, Yao Zhou, Jichen Dong, Peiling Li, Zhaowei Zhang, Zhen Wang, Yung-Chang Lin, Jia Shi, Runwu Zhang, Yanzhen Zheng, Huimei Yu, Bijun Tang, Fucai Liu, Lin Wang, Liwei Liu, Gui-Bin Liu, Weida Hu, Yanfeng Gao, Haitao Yang, Weibo Gao, Li Lu, Yeliang Wang, Kazu Suenaga, Guangtong Liu, Feng Ding, Yugui Yao, Zheng Liu
Summary: This study reveals a competitive-chemical-reaction-based growth mechanism that allows for the growth of transition metal chalcogenides and transition metal phosphorous chalcogenides with different compositions and phases. It provides an interesting platform for the exploration of 2D TMPCs and TMCs.
Article
Multidisciplinary Sciences
Meizhen Huang, Zefei Wu, Jinxin Hu, Xiangbin Cai, En Li, Liheng An, Xuemeng Feng, Ziqing Ye, Nian Lin, Kam Tuen Law, Ning Wang
Summary: This study reports a significant breakthrough in the efficiency of nonlinear Hall generation in small-angle-twisted bilayer WSe2, reaching 1000 V-1, which is a hundred times higher than the previous records. The researchers explained this result through the correlation-induced continuous Mott transition effect.
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Xu Zhang, Chunli Wang, Zhenwei Ou, Xiaohong Jiang, Jinlian Chen, Huifang Ma, Chenyang Zha, Wei Wang, Linghai Zhang, Ti Wang, Lin Wang
Summary: In this study, a new WSe2/FePS3 heterostructure was constructed, and WSe2 was used as a sensor to visualize the thickness-dependent properties of FePS3. It was found that the photoluminescence (PL) intensity of monolayer WSe2 was strongly quenched on or above the FePS3, and this quenching effect became more pronounced as the thickness of FePS3 increased. This is attributed to the efficient charge transfer process occurring at the WSe2/FePS3 interface with type II band alignment, which is faster for thicker FePS3 as evidenced by transient absorption measurements. The thickness-dependent charge transfer process and corresponding excitonic properties were further revealed in low-temperature photoluminescence spectra of WSe2/FePS3 heterostructures. This study demonstrates that the thickness of 2D magnetic materials can be used as an experimental tuning knob to manipulate the optical performance of conventional 2D semiconductors, giving van der Waals heterostructures more unexpected properties and functionalities.
Article
Nanoscience & Nanotechnology
Meizhen Huang, Zefei Wu, Ning Wang, Siu-Tat Chui
Summary: Coulomb drag experiments reveal anomalous behaviors in a 2D electron-electron bilayer system made of atomically thin MoS2 stacked on dielectric layers of boron nitride. The measured drag resistance deviates from the predicted behavior and increases with decreasing temperature. The phenomenon is explained by the formation of correlation-induced electron solid phases and is enhanced by the potential due to the boron nitride dielectric layers.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Multidisciplinary Sciences
Na Xin, James Lourembam, Piranavan Kumaravadivel, A. E. Kazantsev, Zefei Wu, Ciaran Mullan, Julien Barrier, Alexandra A. Geim, I. V. Grigorieva, A. Mishchenko, A. Principi, V. I. Fal'ko, L. A. Ponomarenko, A. K. Geim, Alexey I. Berdyugin
Summary: The most distinctive feature of graphene is its electronic spectrum, in which the Dirac point is located. At low temperatures, the intrinsic behavior of this spectrum is often hidden by charge inhomogeneity, but thermal excitations can overcome the disorder at higher temperatures and create an electron-hole plasma. The behavior of this plasma in magnetic fields is not well understood at present.
Article
Multidisciplinary Sciences
P. Z. Sun, W. Q. Xiong, A. Bera, I. Timokhin, Z. F. Wu, A. Mishchenko, M. C. Sellers, B. L. Liu, H. M. Cheng, E. Janzen, J. H. Edgar, I. V. Grigorieva, S. J. Yuan, A. K. Geim
Summary: Defect-free monolayer graphene shows unexpected catalytic activity in splitting molecular hydrogen, attributed to surface nanoripples. This finding may have implications for other chemical reactions involving graphene and is important for two-dimensional materials in general.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)