Article
Materials Science, Multidisciplinary
Ling Zhou, Junwei Huang, Ming Tang, Caiyu Qiu, Feng Qin, Caorong Zhang, Zeya Li, Di Wu, Hongtao Yuan
Summary: Magnetic tunnel junctions (MTJs) are spintronic devices based on the spin valve effect, and can be improved by utilizing advanced 2D ferromagnetic materials or exploring the gate-tunable magnetic properties. Recent research has shown that gate-tunable MTJ devices can be achieved by electrolyte gating, allowing for adjustable magnetoresistance ratio and magnetoresistance switching strength.
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wenkai Zhu, Hailong Lin, Faguang Yan, Ce Hu, Ziao Wang, Lixia Zhao, Yongcheng Deng, Zakhar R. Kudrynskyi, Tong Zhou, Zakhar D. Kovalyuk, Yuanhui Zheng, Amalia Patane, Igor Zutic, Shushen Li, Houzhi Zheng, Kaiyou Wang
Summary: This study reports all-2D van der Waals vertical spin-valve devices with two distinct transport behaviors and reveals the critical role of pinholes in the magnetoresistance of such devices.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Kenan Zhang, Changchun Ding, Baojun Pan, Zhen Wu, Austin Marga, Lijie Zhang, Hao Zeng, Shaoming Huang
Summary: This study investigates the growth mechanisms of 2D van der Waals heterostructures using a custom-built system and identifies a new growth mode with different rate and morphology. A model is proposed to explain the differences in morphologies and growth rates of the two modes. The findings from a range of material combinations may benefit the synthesis of other 2D heterostructures with controlled properties for future device applications.
ADVANCED MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Xiangdong Guo, Wei Lyu, Tinghan Chen, Yang Luo, Chenchen Wu, Bei Yang, Zhipei Sun, F. Javier Garcia de Abajo, Xiaoxia Yang, Qing Dai
Summary: 2D monolayers can be vertically stacked in van der Waals heterostructures to support a wide range of confined polaritons. This offers advantages in terms of controlling the constituent layers, stacking sequence, and twist angles. These heterostructures have extended the performance and functions of polaritons, and potential applications include nanophotonic integrated circuits.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Carla Boix-Constant, Victor Garcia-Lopez, Efren Navarro-Moratalla, Miguel Clemente-Leon, Jose Luis Zafra, Juan Casado, Francisco Guinea, Samuel Manas-Valero, Eugenio Coronado
Summary: Van der Waals heterostructures offer the possibility of engineering new materials with unique functionalities by assembling different materials in layered structures. In this study, a molecular building block capable of producing strain, known as spin-crossover, is introduced to expand the family of van der Waals heterostructures. The electronic and optical properties of 2D materials can be switched by the strain accompanying the spin transition in smart van der Waals heterostructures. These molecular/inorganic heterostructures have significant applications in the fields of straintronics and band engineering in low-dimensional materials.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yuanhui Zheng, Xiaolei Ma, Faguang Yan, Hailong Lin, Wenkai Zhu, Yang Ji, Runsheng Wang, Kaiyou Wang
Summary: Utilizing van der Waals heterostructures with WSe2 barriers has demonstrated the spin-filtering effect, allowing for manipulation of magnetoresistance through changing the thickness of WSe2. A spin-filtering model based on Delta-symmetry electrons tunneling explains the transition from negative to positive MR signal. These findings highlight the potential of TMDC materials in controlling spin currents in 2D spintronic devices.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Multidisciplinary Sciences
Guanghui Cheng, Mohammad Mushfiqur Rahman, Zhiping He, Andres Llacsahuanga Allcca, Avinash Rustagi, Kirstine Aggerbeck Stampe, Yanglin Zhu, Shaohua Yan, Shangjie Tian, Zhiqiang Mao, Hechang Lei, Kenji Watanabe, Takashi Taniguchi, Pramey Upadhyaya, Yong P. Chen
Summary: The researchers studied the heterostructures of CrI3 and CrCl3 using magneto-optical Kerr effect microscopy and found ferromagnetic interfacial coupling between the two materials. They also discovered that the coercivity of the heterostructure can be controlled by an electric field.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Tiancheng Song, Eric Anderson, Matisse Wei-Yuan Tu, Kyle Seyler, Takashi Taniguchi, Kenji Watanabe, Michael A. McGuire, Xiaosong Li, Ting Cao, Di Xiao, Wang Yao, Xiaodong Xu
Summary: The development of van der Waals crystals and their heterostructures has provided a platform for exploring optoelectronic properties in the 2D limit. By incorporating spin degree of freedom control with the recent discovery of 2D magnets, researchers have observed spin photovoltaic effects in vdW heterostructures of 2D magnet CrI3 sandwiched by graphene contacts, leading to the discovery of giant photo-magnetocurrent.
Article
Chemistry, Multidisciplinary
Victor Zatko, Simon Mutien-Marie Dubois, Florian Godel, Cecile Carretero, Anke Sander, Sophie Collin, Marta Galbiati, Julian Peiro, Federico Panciera, Gilles Patriarche, Pierre Brus, Bernard Servet, Jean-Christophe Charlier, Marie-Blandine Martin, Bruno Dlubak, Pierre Seneor
Summary: This study presents a growth process utilizing pulsed laser deposition to create large-scale complex van der Waals heterostructures at a high temperature, demonstrating the successful construction of multilayer stacks in a single run with high homogeneity. The structural preservation achieved through continuous in situ growth allows even the most fragile 2D layers to remain intact when encapsulated in van der Waals heterostructures.
Article
Nanoscience & Nanotechnology
Yanfei Wu, Qirui Cui, Mengyuan Zhu, Xinjie Liu, Yi Wang, Jingyan Zhang, Xinqi Zheng, Jianxin Shen, Ping Cui, Hongxin Yang, Shouguo Wang
Summary: Efforts towards realizing spin-polarized transports in ideal materials, such as magnetized graphene or quantum Hall states, is a hot topic in spintronics. Magnetic van der Waals materials provide a platform to explore various physical phenomena and technologies within the 2D limit, as demonstrated in this study on chromium trichloride (CrCl3)/bilayer graphene (BLG) heterostructures. The induced exchange field modulates the quantum Hall ground state of BLG and supports the formation of a canted antiferromagnetic phase under an external perpendicular magnetic field.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Jian Jiang, Ruiqing Cheng, Wenyong Feng, Lei Yin, Yao Wen, Yanrong Wang, Yuchen Cai, Yong Liu, Hao Wang, Baoxing Zhai, Chuansheng Liu, Jun He, Zhenxing Wang
Summary: Ultrathin cobalt single-crystalline nanosheets with a sub-millimeter scale were synthesized via van der Waals epitaxy for the first time. The thickness can be as low as approximate to 6 nm. Theoretical calculations revealed their intrinsic ferromagnetic nature and epitaxial mechanism, providing a valuable case for synthesizing 2D elementary metal crystals with pure phase and room-temperature ferromagnetism.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hao Wang, Lihong Bao, Roger Guzman, Kang Wu, Aiwei Wang, Li Liu, Liangmei Wu, Jiancui Chen, Qing Huan, Wu Zhou, Sokrates T. Pantelides, Hong-Jun Gao
Summary: The development of electrically ultrafast-programmable semiconductor homojunctions can lead to transformative multifunctional electronic devices. Here, 2D, multi-functional, lateral homojunctions made of van der Waals heterostructures with a semi-floating-gate configuration on a p(++) Si substrate are introduced. These homojunctions can be electrostatically programmed in nanoseconds, and have rectification ratio up to & AP;10(5), enabling them to function as logic rectifiers, memories, and multi-valued logic inverters. The devices are also compatible with Si technology.
ADVANCED MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Lixin Liu, Tianyou Zhai
Summary: The article reviews the latest research activities on wafer-scale vdWHs and their applications, outlining preparation strategies and applications to showcase their potential in electronic, optoelectronic, and flexible devices fields.
Article
Chemistry, Physical
Yang Liu, Yuqiao Guo, Changzheng Wu, Yi Xie
Summary: Spintronics is an emerging field as an alternative to traditional silicon transistor-based electronics. Recent progress has been made in understanding spin-dependent transport behaviors at the 2D scale, particularly in nonmagnetic materials and long-range ferromagnetic materials. Chemical modulation strategies and challenges in the study of spin-dependent transport of 2D modified materials and spintronic devices are highlighted.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Multidisciplinary
Zhicheng Rao, Shangjie Tian, Shunye Gao, Quanxin Hu, Wenhui Fan, Jierui Huang, Cenyao Tang, Yaobo Huang, Hechang Lei, Yujie Sun, Tian Qian, Hong Ding
Summary: The CoSi family exhibits unconventional topology with surface Fermi arcs connecting the surface projections of the nodes. Using angle-resolved photoemission spectroscopy, the (001) surface states of pristine and Ni-doped CoSi were systematically investigated. The surface states show saddle-like band structures near the time-reversal invariant point, and the Fermi arcs undergo consecutive Lifshitz transitions at the saddle points, potentially leading to exotic many-body physical phenomena.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Multidisciplinary Sciences
Geng LjD, Haitao YangLE, Peijie Jiang, Cong Wang, Qiuzhen Cheng, Shangjie Tian, Guangyuan Han, Chengmin Shen, Xiao Lin, Hechang Lei, Wei Ji, Ziqiang Wang, Hong-Jun Gao
Summary: This study reports the discovery of a novel unidirectional charge density wave (CDW) order on the surface of chiral crystal CoSi, which is a unique Weyl semimetal with unconventional chiral fermions. The CDW is incommensurate with lattice momentum and crystalline symmetry directions, and exhibits a pi phase shift in the layer stacking direction. The tunneling spectrum shows an energy gap that modulates spatially with the CDW wave vector.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Chunsheng Gong, Shangjie Tian, Zhijun Tu, Qiangwei Yin, Yang Fu, Ruitao Luo, Hechang Lei
Summary: We investigate the physical properties of YRu3Si2 with the Ru kagome lattice in normal and superconducting states. Our measurements reveal that YRu3Si2 is a type-II bulk superconductor with a critical temperature of around 3.0 K, and the superconductivity may originate from weak or moderate electron-phonon coupling. Moreover, we observe a strong electron correlation effect in this system, possibly related to the flat band feature of the kagome lattice.
CHINESE PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Cuiying Pei, Jianfeng Zhang, Chunsheng Gong, Qi Wang, Lingling Gao, Yi Zhao, Shangjie Tian, Weizheng Cao, Changhua Li, Zhong-Yi Lu, Hechang Lei, Kai Liu, Yanpeng Qi
Summary: The recent discovery of high-temperature superconductivity in MoB2 has reignited interest in exploring high-Tc superconductors in transition-metal diborides. In this study, the responses of WB2 and ReB2 to external pressure were systematically investigated. It was found that WB2 exhibits pressure-induced superconductivity, while ReB2 does not. The results highlight the importance of the geometry of boron layers in determining the superconductivity.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Chemistry, Multidisciplinary
Zhaohui Li, Hengjun Liu, Zhiqiang Zhao, Qinghua Zhang, Xingke Fu, Xiangkun Li, Fangchao Gu, Hai Zhong, Yuanyuan Pan, Guihuan Chen, Qinghao Li, Hongsen Li, Yanxue Chen, Lin Gu, Kuijuan Jin, Shishen Yan, Guo-xing Miao, Chen Ge, Qiang Li
Summary: Ferromagnetic metals have the potential for use in ultralow-power-consumption spintronic devices due to their high Curie temperature and robust magnetization. However, there is a lack of reliable solutions for giant and reversible voltage control of magnetism in ferromagnetic metal films. In this study, a novel space-charge approach is proposed, which allows for achieving a large modulation of magnetism in Co/TiO2 multilayer granular films under low voltage. The results demonstrate the potential of this approach in modulating magnetism in ferromagnetic metals and pave the way for the development of ionic-magnetic-electric coupled applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Bowen Yang, Yin Min Goh, Suk Hyun Sung, Gaihua Ye, Sananda Biswas, David A. S. Kaib, Ramesh Dhakal, Shaohua Yan, Chenghe Li, Shengwei Jiang, Fangchu Chen, Hechang Lei, Rui He, Roser Valenti, Stephen M. Winter, Robert Hovden, Adam W. Tsen
Summary: The authors investigate the magnetic anisotropy in monolayer RuCl3 and observe a transition from easy-plane to easy-axis due to in-plane distortions of Cl atoms. This finding is important for realizing a quantum spin liquid. The study provides insights into the possibility of exploring Kitaev physics in a true two-dimensional limit.
Article
Chemistry, Physical
Xiao-Qi Xu, Yingchao Ma, Ning-jiu Zhao, Shangjie Tian, Hechang Lei, Yapei Wang
Summary: Benefiting from their deep tissue penetration and high allowed maximum exposure power, near-infrared (NIR)-II absorbers have gained considerable attention for photothermal conversion. By introducing a stimuli-responsive behavior, specificity and intelligent NIR-II photothermal conversion can be achieved. However, current NIR-II absorbers are mostly constructed by conjugated polymers, limiting their modification possibilities, while small molecular chromophores can be easily functionalized but have limited absorption bands. To address this contradiction, turn-on types of absorbers were developed with a two-stage superlarge redshifted absorption under protonation stimulation. The photothermal conversion abilities of these absorbers can be switched on and off synchronously under specific laser irradiation wavelengths.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Multidisciplinary Sciences
Zhicheng Rao, Quanxin Hu, Shangjie Tian, Qing Qu, Congrun Chen, Shunye Gao, Zhenyu Yuan, Cenyao Tang, Wenhui Fan, Jierui Huang, Yaobo Huang, Li Wang, Lu Zhang, Fangsen Li, Kedong Wang, Huaixin Yang, Hongming Weng, Tian Qian, Jinpeng Xu, Kun Jiang, Hechang Lei, Yu-Jie Sun, Hong Ding
Summary: Metallic topological boundary states at the boundary between topological non-trivial and trivial phases are usually gapless. We observed incommensurate charge density wave (CDW) formed on the topological boundary states of CoSi (001) surface driven by electron-electron interactions. The wavevector of CDW varies with temperature, coinciding with the evolution of topological surface Fermi arcs. The orientation of the CDW phase is determined by the chirality of the Fermi arcs, indicating a direct association between CDW and Fermi arcs. Our finding will stimulate the search for more interaction-driven ordered states, such as superconductivity and magnetism, on the boundaries of topological materials.
Article
Physics, Applied
Lingling Gao, Juefei Wu, Ming Xi, Cuiying Pei, Qi Wang, Yi Zhao, Shangjie Tian, Changhua Li, Weizheng Cao, Yulin Chen, Hechang Lei, Yanpeng Qi
Summary: In this study, we investigated the anomalous Hall effect of the magnetic topological insulator MnSb4Te7 under high pressure. Through transport measurements and theoretical calculations, we found that MnSb4Te7 undergoes a magnetic phase transition from A-type antiferromagnetic to ferromagnetic at 3.78 GPa, while maintaining a rhombohedral crystal structure. The anomalous Hall conductance s(xy)(A) is dominated by intrinsic mechanism even after the magnetic phase transition. These findings provide insights into the intriguing magnetism in MnSb4Te7 and the relationship between topology and magnetism in topological materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Rabiul Islam, Peng Li, Marijan Beg, Manoj Sachdev, Guo-Xing Miao
Summary: In this study, a helimagnet-based emerging memory device design is presented, which can store multiple bits of information per device. The device consists of a helimagnet layer placed between two ferromagnetic layers, allowing specific spin configurations to be locked in. The writing of memory states is simulated by applying an in-plane magnetic field that rotates and transforms the spin configurations of the device. By simply changing the direction of the field, multi-bit data storage per unit memory cell can be achieved.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Hongchao Xie, Xiangpeng Luo, Zhipeng Ye, Zeliang Sun, Gaihua Ye, Suk Hyun Sung, Haiwen Ge, Shaohua Yan, Yang Fu, Shangjie Tian, Hechang Lei, Kai Sun, Robert Hovden, Rui He, Liuyan Zhao
Summary: Moire magnetism provides a platform for designing and controlling exotic magnetic phases in twisted magnetic two-dimensional crystals. Non-collinear spin structures have been observed in two-dimensional twisted double bilayer CrI3, which opens up possibilities for exploring non-trivial magnetism with non-collinear spins.
Article
Physics, Applied
Hengjun Liu, Fangchao Gu, Xiancheng Sang, Yuanyuan Han, Feihu Zou, Zhaohui Li, Yufeng Qin, Li Cai, Yuanyuan Pan, Qiang Cao, Guo-xing Miao, Qiang Li
Summary: In this study, FeO nanoparticles were prepared based on the lithium-battery reaction mechanism, and operando magnetometry measurements were carried out. The results showed strong ferromagnetism and a high Curie temperature of nanosized FeO, attributed to surface frustration and the surface-bulk exchange interaction. These findings confirm the surface ferromagnetism of FeO and provide valuable insights for the design of spintronic devices.
PHYSICAL REVIEW APPLIED
(2023)
Review
Multidisciplinary Sciences
Cuiying Pei, Jianfeng Zhang, Qi Wang, Yi Zhao, Lingling Gao, Chunsheng Gong, Shangjie Tian, Ruitao Luo, Mingtao Li, Wenge Yang, Zhong-Yi Lu, Hechang Lei, Kai Liu, Yanpeng Qi
Summary: The discovery of superconductivity up to 32K in MoB2 under pressure is reported, highlighting the roles of transitional metals in high-Tc superconductors. Despite the exploration of approximately 100 binary borides, only a few of them exhibit relatively low Tc superconductivity. The high Tc of 32K in MoB2 is well explained by theoretical calculations based on electron-phonon coupling, with the coupling between Mo's d electrons and out-of-plane Mo-phonon modes being the main driving force. This study provides insights into the exploration of high-Tc superconductors in transition metal borides.
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Subin Lee, Seon Yeon Choi, Byung Chul Jang, Dong Hyun Lee, Joon Young Cho, Joong Tark Han, Hocheon Yoo, Hyun Ho Kim
Summary: This study introduces a new concept of physical unclonable functions (PUFs) using reduced graphene oxide (GO) materials. Two types of GO, HGO and PGO, are used to create a disordered conductivity distribution. PGO becomes graphene-like after room-temperature chemical reduction. The blending of these two materials generates a random mixture that can generate highly unpredictable electrical signals, serving as ideal security keys with strong randomness and uniqueness. The optimized PUF device based on this approach demonstrates excellent performance in generating secure keys.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sun Woo Kim, Seon Yeon Choi, Si Heon Lim, Eun Bee Ko, Seunghyun Kim, Yun Chang Park, Sunghun Lee, Hyun Ho Kim
Summary: This study investigates the issues of process instability and the deterioration of semiconducting properties in Janus MoSSe caused by its nonzero net dipole moments. By designing van der Waals heterostructure-based FETs, the authors successfully improved electron mobility and stability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
