Article
Chemistry, Multidisciplinary
Wenhao Huang, Oliver Braun, David I. Indolese, Gabriela Borin Barin, Guido Gandus, Michael Stiefel, Antonis Olziersky, Klaus Mu''llen, Mathieu Luisier, Daniele Passerone, Pascal Ruffieux, Christian Scho''nenberger, Kenji Watanabe, Takashi Taniguchi, Roman Fasel, Jian Zhang, Michel Calame, Mickael L. Perrin
Summary: Bottom-up-synthesized graphene nanoribbons (GNRs) are a type of designer quantum materials with superior properties and have potential applications in various fields. However, making electrical contact with GNRs is still a major challenge due to their small size.
Article
Nanoscience & Nanotechnology
L. P. Miranda, D. R. Da Costa, F. M. Peeters, R. N. Costa Filho
Summary: This study investigates the effects of defect clustering on the electronic and transport properties of bilayer graphene nanoribbons. The researchers observe evident vacancy concentration signatures around the zero-energy level, regardless of system size, stacking, and boundary types. The results indicate that the strong sizeable vacancy clustering effect and the breaking of inversion symmetry at high vacancy densities play a crucial role in explaining this phenomenon.
Article
Chemistry, Physical
Oleg Kononenko, Maria Brzhezinskaya, Aleksandr Zotov, Vitaly Korepanov, Vladimir Levashov, Victor Matveev, Dmitry Roshchupkin
Summary: Band structure engineering through changing the parameters of Moire superlattices can create materials with outstanding properties. This study demonstrated the strong dependence of the transport properties of twisted multilayer graphene (tMLG) on its structural characteristics. tMLG with a large content of the twisted phase was found to have perfect structure and extraordinary transport characteristics, while changes in the content of the twisted phase led to a significant decrease in transport properties. Therefore, tMLG is a better choice for the nanoelectronics industry.
Article
Materials Science, Multidisciplinary
S. Azar Oliaei Motlagh, Vadym Apalkov
Summary: The interaction between graphene quantum dots (GQDs) and ultrashort strong optical pulses was studied theoretically. The absorbance of GQDs has a highly nonlinear dependence on the field amplitude, showing different relationships at small and large-field amplitudes. The absorbance also has a maximum value depending on the size of the dot as the field amplitude changes.
Article
Materials Science, Multidisciplinary
Ahmal Jawad Zafar, Aranyo Mitra, Vadym Apalkov
Summary: In this study, the electron dynamics of a graphene nanoring in the presence of an ultrashort optical pulse were theoretically investigated. It was found that circularly polarized pulses can induce valley polarization in the graphene nanoring, whereas no valley polarization is observed in a graphene monolayer. The magnitude of the valley polarization in the graphene nanoring depends on the system parameters.
Article
Chemistry, Multidisciplinary
Peizong Chen, Ningning Zhang, Kun Peng, Lijian Zhang, Jia Yan, Zuimin Jiang, Zhenyang Zhong
Summary: An innovative strategy has been developed to realize artificial graphene on Si substrates by fabricating a honeycomb lattice of Au nanodisks, resulting in unique features such as nonlinear current-voltage curves and conductance phase transitions. These characteristics are interpreted by a model based on the Coulomb blockade effect, resonant tunneling, and hole coupling within the artificial graphene.
Article
Nanoscience & Nanotechnology
Christian Dolle, Peter Schweizer, Daniela Dasler, Sebastian Gsaenger, Robert Maidl, Gonzalo Abellan, Frank Hauke, Bernd Meyer, Andreas Hirsch, Erdmann Spiecker
Summary: Covalent functionalisation is an effective approach to tune the properties and processability of graphene. This study successfully observed atomic resolution imaging of dodecyl functionalised monolayer graphene using mechanical filtering method, providing new possibilities for the investigation of this hybrid material.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Emma L. Minarelli, Jonas B. Rigo, Andrew K. Mitchell
Summary: This article investigates a graphene-based two-channel charge-Kondo device and uncovers a rich phase diagram. It finds that the strong coupling pseudogap Kondo phase persists in the channel-asymmetric case. Furthermore, despite the vanishing density of states in the graphene leads, a finite linear conductance is observed at the frustrated critical point.
Article
Multidisciplinary Sciences
Bhupesh Bishnoi, Marius Buerkle, Hisao Nakamura
Summary: In this study, we simulated distorted graphene sheets to investigate their non-idealities and variations. We found that surface corrugation increases the distribution variation of electronic and hole density in the devices, leading to the formation of electron-hole charge puddles in the sheet.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Xianzhang Chen, Guillaume Weick, Dietmar Weinmann, Rodolfo A. Jalabert
Summary: The effect of a scanning gate microscopy tip on the conductance of graphene nanoribbons and nanoconstrictions is studied. The conductance corrections caused by the tip potential disturbance are expressed explicitly according to scattering states. The results confirm that the second-order term prevails in the conductance plateaus, and resonances appear when the probe potential is beyond the perturbative regime.
Article
Chemistry, Multidisciplinary
Ruiyang Song, Haiou Zeng, Shengping Zhang, Ying Wang, Xiao Han, Xiaobo Chen, Luda Wang
Summary: This study investigates multivalent cations-modulated low-frequency noise in graphene nanopores and demonstrates that the noise originates from surface charge fluctuations induced by reversible adsorption-desorption of ions. The amplitude of the noise can be greatly controlled up to about 3 orders of magnitude by adding trace amounts of multivalent cations. Additionally, the low-frequency noise can be suppressed by 2 orders of magnitude by adding organic solvents with a high dielectric constant to inhibit interactions between surface charge and ions.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Amir Taqieddin, N. R. Aluru
Summary: Graphene nanoribbons (GNRs) can be assembled to form 2D nanoarchitectures with unique electronic features. This study investigates 1D and 2D GNR-based heterojunctions, revealing emergent electronic states at the interface when combining different GNR shapes. Doping with nitrogen can change the electronic structure, and applying compressive strain lowers bandgap and enhances electronic conductance in the nanoarchitectures.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Hewei Zhang, Ping Zhou, Abdalghani Daaoub, Sara Sangtarash, Shiqiang Zhao, Zixian Yang, Yu Zhou, Yu-Ling Zou, Silvio Decurtins, Robert Haener, Yang Yang, Hatef Sadeghi, Shi-Xia Liu, Wenjing Hong
Summary: Nitrogen doping of graphene leads to graphene heterojunctions with a tunable bandgap, suitable for various applications. In this work, atomically well-defined N-doped graphene heterojunctions were fabricated and their electronic properties were investigated. It was found that different doping numbers and positions of nitrogen atoms affected the conductance of the heterojunctions significantly. Furthermore, the insertion of nitrogen atoms into the conjugation framework of graphene stabilized the molecular orbitals and altered their relative positions to the Fermi level of the electrodes.
Review
Chemistry, Multidisciplinary
R. S. Koen Houtsma, Joris de la Rie, Meike Stohr
Summary: Graphene nanoribbons show great potential for future applications in nanoelectronic devices by combining excellent electronic properties with tunability through precise control over width and edge structure. Research has led to a variety of graphene nanoribbons with different properties, highlighting the importance of precursor design in determining final electronic structure. The ability to fine-tune properties through precursor design has generated significant research interest and potential for future applications, as demonstrated by selected device prototypes.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Michele Pizzochero, Kristians Cernevics, Gabriela Borin Barin, Shiyong Wang, Pascal Ruffieux, Roman Fasel, Oleg Yazyev
Summary: The study reveals the ubiquitous presence of 'bite' defects in on-surface synthesized graphene nanoribbons, which significantly disrupt the quantum charge transport properties. Through experimental visualization and first-principles calculations, it is shown that these imperfections have a strong detrimental effect on the conduction properties, leading to the establishment of practical guidelines to minimize their impact on charge transport.
Article
Chemistry, Multidisciplinary
Ziqian Wang, Meng Gao, Tonghua Yu, Siyuan Zhou, Mingquan Xu, Motoaki Hirayama, Ryotaro Arita, Yuki Shiomi, Wu Zhou, Naoki Ogawa
Summary: Stacking order plays a significant role in the properties of van der Waals layered magnets, and recent studies suggest possible different stackings in few-layer crystals. This study combines atomic-scale electron microscopy and theoretical calculations to show that while the bulk stacking persists in bilayers of MnPS3, the local rippling effect lifts the monoclinic symmetry of the few layers. This finding reveals the impact of rippling on the microscopic symmetry of two-dimensional materials and suggests the possibility of approaching the two-dimensional Neel antiferromagnetic honeycomb lattice in MnPS3 without reaching monolayer thickness.
Article
Chemistry, Multidisciplinary
Roger Guzman, Shoucong Ning, Ruizi Zhang, Hongtao Liu, Yinhang Ma, Yu-Yang Zhang, Lihong Bao, Haitao Yang, Shiduan Du, Michel Bosman, Stephen J. Pennycook, Hong-Jun Gao, Wu Zhou
Summary: In this study, the local atomic structure and magnetic behavior of V-rich V1+xTe2 nanoplates with embedded V3Te4 nanoclusters have been investigated. The self-intercalated V3Te4 magnetic phase, which possesses a distorted 1T'-like monoclinic structure, is locally stabilized by V intercalations. The phase transition is controlled by the electron doping from the intercalant V ions. The results provide insights into the studies of dilute magnetism at the 2D limit and strategies for the manipulation of magnetism for spintronic applications.
Article
Chemistry, Multidisciplinary
Zhaozhong Fan, Ruichun Luo, Yanxue Zhang, Bo Zhang, Panlong Zhai, Yanting Zhang, Chen Wang, Junfeng Gao, Wu Zhou, Licheng Sun, Jungang Hou
Summary: Researchers have developed an indium-nickel dual-atom catalyst that exhibits high CO selectivity and achieves a high industrial CO partial current density. The synergistic effect of the dual-sites and oxygen bridge in the catalyst reduces the reaction barrier for *COOH formation and suppresses the undesired hydrogen evolution reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Multidisciplinary
Qin Wang, Jie Zhang, Jierui Huang, Jinan Shi, Shuai Zhang, Hui Guo, Li Huang, Hong Ding, Wu Zhou, Yan-Fang Zhang, Xiao Lin, Shixuan Du, Hong-Jun Gao
Summary: Researchers successfully synthesized a monolayer of gold telluride (AuTe) with a honeycomb structure, which suggests that it could be a good candidate for studying two-dimensional Dirac nodal line fermions.
Article
Chemistry, Multidisciplinary
Kate Reidy, Paulina Ewa Majchrzak, Benedikt Haas, Joachim Dahl Thomsen, Andrea Konecna, Eugene Park, Julian Klein, Alfred J. H. Jones, Klara Volckaert, Deepnarayan Biswas, Matthew D. Watson, Cephise Cacho, Prineha Narang, Christoph T. Koch, Soren Ulstrup, Frances M. Ross, Juan Carlos Idrobo
Summary: The integration of metallic contacts with 2D semiconductors can significantly affect the local optoelectronic properties. In this study, we analyze the local excitonic changes in a 2D semiconductor MoS2 in contact with Au. Our findings suggest that the observed changes are due to the dielectric screening of the excitonic Coulomb interaction, and increasing the van der Waals distance can optimize excitonic spectra in mixed-dimensional interfaces.
Article
Multidisciplinary Sciences
Qiangbing Guo, Xiao-Zhuo Qi, Lishu Zhang, Meng Gao, Sanlue Hu, Wenju Zhou, Wenjie Zang, Xiaoxu Zhao, Junyong Wang, Bingmin Yan, Mingquan Xu, Yun-Kun Wu, Goki Eda, Zewen Xiao, Shengyuan A. Yang, Huiyang Gou, Yuan Ping Feng, Guang-Can Guo, Wu Zhou, Xi-Feng Ren, Cheng-Wei Qiu, Stephen J. Pennycook, Andrew T. S. Wee
Summary: A van der Waals crystal, niobium oxide dichloride (NbOCl2), has been found to exhibit weakened interlayer electronic coupling and monolayer-like excitonic behavior in the bulk form. It also has a scalable second-harmonic generation intensity that is three orders higher than that in monolayer WS2. Additionally, the strong second-order nonlinearity in thin flakes as thin as 46 nm enables correlated parametric photon pair generation through a spontaneous parametric down-conversion (SPDC) process. This is the first SPDC source demonstrated in two-dimensional layered materials and the thinnest SPDC source ever reported. This research opens avenues for developing van der Waals material-based ultracompact on-chip SPDC sources and high-performance photon modulators in both classical and quantum optical technologies.
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)
Article
Chemistry, Physical
Pamela Machado, Roger Guzman, Ramon J. . Morera, Jordi Alcala, Anna Palau, Wu Zhou, Mariona Coll
Summary: The need for highly performant and stable p-type transparent electrodes based on abundant metals is driving research on perovskite oxide thin films. Cost-efficient and scalable solution-based techniques are being explored to prepare these materials and extract their full potential.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qi Zhang, Mi Peng, Zirui Gao, Wendi Guo, Zehui Sun, Yi Zhao, Wu Zhou, Meng Wang, Bingbao Mei, Xian-Long Du, Zheng Jiang, Wei Sun, Chao Liu, Yifeng Zhu, Yong-Mei Liu, He-Yong He, Zhen Hua Li, Ding Ma, Yong Cao
Summary: The study presents a biomimetic system that can imitate or surpass natural enzymes for bioinspired syntheses of non-natural reactions. Through the development of this widely applicable platform, the scalable synthesis of over 100 industrially and pharmaceutically appealing O-silylated compounds is demonstrated. This heterogeneous oxidase mimic also has potential for expanding the catalytic scope of enzymatic synthesis.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Songge Li, Yun-Peng Wang, Shoucong Ning, Kai Xu, Sokrates T. Pantelides, Wu Zhou, Junhao Lin
Summary: A single-frame scanning transmission electron microscopy (STEM) image can be used to reconstruct the ripple structure in monolayer MoSe2, allowing for direct visualization of the dynamics of three-dimensional ripple deformation at the atomic scale. Furthermore, the reconstructed images provide an opportunity to test the validity of the classical theory of thermal fluctuations.
Article
Multidisciplinary Sciences
Huifeng Tian, Yinhang Ma, Zhenjiang Li, Mouyang Cheng, Shoucong Ning, Erxun Han, Mingquan Xu, Peng-Fei Zhang, Kexiang Zhao, Ruijie Li, Yuting Zou, PeiChi Liao, Shulei Yu, Xiaomei Li, Jianlin Wang, Shizhuo Liu, Yifei Li, Xinyu Huang, Zhixin Yao, Dongdong Ding, Junjie Guo, Yuan Huang, Jianming Lu, Yuyan Han, Zhaosheng Wang, Zhi Gang Cheng, Junjiang Liu, Zhi Xu, Kaihui Liu, Peng Gao, Ying Jiang, Li Lin, Xiaoxu Zhao, Lifen Wang, Xuedong Bai, Wangyang Fu, Jie-Yu Wang, Maozhi Li, Ting Lei, Yanfeng Zhang, Yanglong Hou, Jian Pei, Stephen J. Pennycook, Enge Wang, Ji Chen, Wu Zhou, Lei Liu
Summary: By varying the growth temperatures, the degree of disorder and electrical conductivity of amorphous carbon films can be tuned, revealing the causal link between microstructures and macroscopic properties of amorphous materials.
Article
Chemistry, Physical
Mingquan Xu, De-Liang Bao, Aowen Li, Meng Gao, Dongqian Meng, Ang Li, Shixuan Du, Gang Su, Stephen J. Pennycook, Sokrates T. Pantelides, Wu Zhou
Summary: By improving the stability and sensitivity of the instrument, we have successfully observed the specific vibrational signals between substitutional impurities and neighboring carbon atoms in monolayer graphene. This work allows for the direct observation of local phonon modes with chemical-bonding sensitivity, providing more insights into defect-induced physics in graphene.
Article
Optics
Dongyu Yang, Wenjin Lv, Junhao Zhang, Hao Chen, Xinkai Sun, Shenzhen Lv, Xinzhe Dai, Ruichun Luo, Wu Zhou, Jisi Qiu, Yishi Shi
Summary: Low-dose imaging techniques are widely used in various fields and can protect samples from damage. However, the noise in low-dose imaging seriously affects the image quality. In this study, we propose a low-dose imaging denoising method that uses a deep neural network and a noise statistical model. The method is evaluated using simulation data and experiments on different imaging systems. The results show improved image quality in terms of signal-to-noise ratio and resolution.
Article
Physics, Applied
Pavel Gallina, Andrea Konecna, Jiri Liska, Juan Carlos Idrobo, Tomas Sikola
Summary: This study investigates a system that can strongly couple localized mid-infrared plasmon modes and phonon polaritons. The coupled modes are characterized using far-field infrared spectroscopy, monochromated electron energy-loss spectroscopy, numerical simulations, and analytical modeling. The results show that the electron probe allows precise characterization and active control of the coupled system in both frequency and space. The study establishes a rigorous description of the spectral features observed in light and electron-based spectroscopies and has potential applications in heat management and electromagnetic field concentration.
PHYSICAL REVIEW APPLIED
(2023)
Editorial Material
Multidisciplinary Sciences
Fucong Chen, Xinbo Bai, Yuxin Wang, Tao Dong, Jinan Shi, Yanmin Zhang, Xiaomin Sun, Zhongxu Wei, Mingyang Qin, Jie Yuan, Qihong Chen, Xinbo Wang, Xu Wang, Beiyi Zhu, Rongjin Huang, Kun Jiang, Wu Zhou, Nanlin Wang, Jiangping Hu, Yangmu Li, Kui Jin, Zhongxian Zhao