Article
Chemistry, Multidisciplinary
Dmitry V. Averyanov, Ivan S. Sokolov, Igor A. Karateev, Alexander N. Taldenkov, Oleg E. Parfenov, Andrey M. Tokmachev, Vyacheslav G. Storchak
Summary: The study demonstrates that the structure of the oxide/Si interface does not depend on the type of the template, its symmetry, and stoichiometry. Chemical transformations of the templates converging into the same 2D product are detected in situ by electron diffraction, and the common interfacial structure of 1D periodicity is visualized by high-resolution electron microscopy.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Matthew G. Boebinger, Courtney Brea, Li-Ping Ding, Sudhajit Misra, Olugbenga Olunloyo, Yiling Yu, Kai Xiao, Andrew R. Lupini, Feng Ding, Guoxiang Hu, Panchapakesan Ganesh, Stephen Jesse, Raymond R. Unocic
Summary: An automated and feedback-controlled atomic fabrication method is developed to create 1D-2D heterostructures in MoS2 with atomic precision. The shape and symmetry of the scanning pathway can be controlled using an aberration-corrected scanning transmission electron microscope. Density functional theory calculations and ab initio molecular dynamic simulations are used to study the energetic barriers for atomic edge structures and transformation pathways. This work provides an automated method for understanding atomic-scale transformations and enables more precise atomic-scale engineering of materials.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Alessandro Troglia, Chiara Bigi, Ivana Vobornik, Jun Fujii, Daniel Knez, Regina Ciancio, Goran Drazic, Marius Fuchs, Domenico Di Sante, Giorgio Sangiovanni, Giorgio Rossi, Pasquale Orgiani, Giancarlo Panaccione
Summary: In this study, the formation and evolution of the 2DEG in TiO2 thin films were investigated using ARPES and XAS techniques, supported by DFT theory. It was found that the 2DEG in anatase TiO2 is stable and the electron filling saturates with increasing thickness.
Article
Chemistry, Multidisciplinary
Xi Yan, Friederike Wrobel, I-Cheng Tung, Hua Zhou, Hawoong Hong, Fanny Rodolakis, Anand Bhattacharya, Jessica L. McChesney, Dillon D. Fong
Summary: In this study, the atomic and electronic structures of the SrTiO3 (001) surface were monitored using in situ techniques. It was observed that a 2D electron gas (2DEG) disappears and reappears after the completion of each SrO and TiO2 monolayer, respectively. The presence of a TiO2 double layer and vacancies within the layer contribute to the generation of a surface potential and mobile electrons, explaining this phenomenon. This finding provides insights into the complex oxide interfaces and facilitates atomic-scale defect engineering in oxide electronics.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Tong Wang, Lu Chang, Huan Wu, Wenhan Yang, Jinrong Cao, Hua Fan, Jingquan Wang, Haitao Liu, Yunhu Hou, Yunchao Jiang, Hao Zhu
Summary: A novel three-dimensional multi-level porous g-C3N4 modified MXene-derived TiO2@C aerogel was synthesized for efficient NO removal. The aerogel exhibited excellent efficiency for NO removal at parts per million level and outperformed other materials in terms of performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Eduardo B. Guedes, Stefan Muff, Walber H. Brito, Marco Caputo, Hang Li, Nicholas C. Plumb, J. Hugo Dil, Milan Radovic
Summary: This study investigates the evolution of the electronic structure of a 2-dimensional electron gas (2DEG) on SrTiO3 surfaces, showing a metal-insulator transition around 135 K caused by local structure relaxations. The research presents a new method of tuning the 2DEG via surface vicinality and explores how prospective devices will respond to temperature changes through experimental and theoretical comparisons.
Article
Chemistry, Multidisciplinary
Chengang Pei, Min-Cheol Kim, Yuankai Li, Chengkai Xia, Jaekyum Kim, Won So, Xu Yu, Ho Seok Park, Jung Kyu Kim
Summary: This study demonstrates an efficient and stable pH-universal electrocatalyst NiCo2S4/ReS2 for hydrogen evolution reaction. The chemically coupled NiCo2S4 and ReS2 layers induce electron transfer and spin crossover, leading to enhanced water dissociation kinetics and superior alkaline HER activity.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jonas Haas, Finn Ulrich, Christoph Hofer, Xiao Wang, Kai Braun, Jannik C. Meyer
Summary: Researchers have successfully stacked individual layers of two-dimensional materials using van der Waals interaction and modified them using electron irradiation and etching techniques to achieve precise control and assembly of structures. The process allows for accurate alignment and stacking of layers under electron microscopy, enabling the fabrication of almost any three-dimensional structure with high spatial resolution.
Review
Chemistry, Multidisciplinary
Ruichun Luo, Meng Gao, Chunwen Wang, Juntong Zhu, Roger Guzman, Wu Zhou
Summary: This review provides an overview of the static and in situ investigation of functional structures, defects, and interfaces in 2D transition metal dichalcogenides (TMDs), primarily utilizing scanning transmission electron microscopy and electron energy loss spectroscopy. Recent advancements in in situ visualization and manipulation of 2D TMDs using electron beams are also highlighted.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Inorganic & Nuclear
Weikang Wang, Weiwei Zhao, Haotian Xu, Shujuan Liu, Wei Huang, Qiang Zhao
Summary: This review presents the characteristics, synthetic strategies, and applications of ultra-thin 2D COF nanosheets in functional electronic devices, as well as discusses the challenges and prospects they face in their synthesis and multifunctional application.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Jun Li, Lijian Zuo, Haotian Wu, Benfang Niu, Shiqi Shan, Gang Wu, Hongzheng Chen
Summary: This study investigates the effect of different 2D spacers on the bottom interface of inverted p-i-n PVSCs, revealing a significant improvement in efficiency and stability after optimization, attributed to the formation of 2D/3D heterojunction and related mechanisms. Additionally, the unencapsulated devices demonstrate excellent stability with 90% retention of initial efficiency after storage under ambient conditions.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Analytical
K. S. Kurmangaleev, M. I. Ikim, V. L. Bodneva, V. S. Posvyanskii, O. J. Ilegbusi, L. I. Trakhtenberg
Summary: The charge distribution and spillover of oxygen atoms in nanostructured CeO2-In2O3 systems were studied. The spillover of oxygen atoms from CeO2 nanoclusters to In2O3 nanoparticles caused an increase in the inhomogeneity of the electron density distribution in the nanoparticles. This increased the resistance of the CeO2-In2O3 system and affected the temperature dependence of the sensor response to hydrogen.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Physics, Applied
Yuan Si, Hong-Yu Wu, Ke Yang, Ji-Chun Lian, Tao Huang, Wei-Qing Huang, Wang-Yu Hu, Gui-Fang Huang
Summary: The current high-throughput design framework tends to omit potential candidates in specific fields, causing statistical deviation. The fragility of this framework is mainly attributed to interlayer orbital coupling.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Anelia Kakanakova-Georgieva, Filippo Giannazzo, Giuseppe Nicotra, Ildiko Cora, Gueorgui K. Gueorguiev, Per O. A. Persson, Bela Pecz
Summary: This study successfully demonstrated the formation of a novel 2D indium oxide, achieved through targeted intercalation and deposition of indium atoms at the graphene/SiC interface. A unique structural configuration with two sub-layers of indium atoms was observed, and bonding of oxygen atoms to indium atoms was confirmed. The 2D indium oxide exhibited a wide bandgap energy of 4.1 eV as estimated by conductive atomic force microscopy measurements.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jordan Bouaziz, Claudia Cancellieri, Bastian Rheingans, Lars P. H. Jeurgens, Fabio La Mattina
Summary: In the past 5 years, the transfer of epitaxial oxide thin films has become a hot topic in the scientific community. This work presents a new method for transferring epitaxial oxide films using a metallic Au/Ag bonding layer, which allows for a rigid bond to the final host substrate. SrRuO3 (SRO) and SrRuO3/SrTiO3 (STO) epitaxial films grown on a water-soluble Sr3Al2O6 sacrificial layer were successfully transferred onto a Si host substrate. The transferred membranes showed low roughness and straight interfaces without plastic deformation, indicating minimal mechanical damage and preservation of the initial quality. This procedure represents an important advancement in the development of technologies for membrane transfer of epitaxial oxides and superstructures.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Physical
Dhani Nafday, Christine Richter, Olivier Heckmann, Weimin Wang, Jean-Michel Mariot, Uros Djukic, Ivana Vobornik, Patrick Lefevre, Amina Taleb-Ibrahimi, Julien Rault, Laurent Nicolai, Chin Shen Ong, Patrik Thunstrom, Karol Hricovini, Jan Minar, Igor Di Marco
Summary: In this study, angle-resolved photoemission spectroscopy and density functional theory are used to investigate the electronic structure of self-assembled Bi nanolines on the InAs(100) surface. The results suggest the presence of a flat band associated with the Bi nanolines, indicating a strongly polarized conductivity that makes them suitable for nanowire applications in nanotechnology. The coexistence with an accumulation layer indicates further functionalization potential.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Mariarosa Cavallo, Erwan Bossavit, Sylvia Matzen, Thomas Maroutian, Rodolphe Alchaar, Tung Huu Dang, Adrien Khalili, Corentin Dabard, Huichen Zhang, Yoann Prado, Claire Abadie, James K. Utterback, Jean Francois Dayen, Mathieu G. G. Silly, Pavel Dudin, Jose Avila, Emmanuel Lhuillier, Debora Pierucci
Summary: By coupling an NC layer to a ferroelectric material, the carrier density control is achieved, leading to the formation of a lateral pn junction and improving the sensitivity and detectivity of infrared photodiodes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Condensed Matter
Paul Foulquier, Marcello Civelli, Marcelo Rozenberg, Alberto Camjayi, Joel Bobadilla, Dorothee Colson, Anne Forget, Pierre Thuery, Francois Bertran, Patrick Le Fevre, Veronique Brouet
Summary: Sr2IrO4 and Sr3Ir2O7 are two families of spin-orbit Mott insulators with distinct charge gaps and antiferromagnetic ground states. The impact of long-range magnetic order in Mott insulators appears to be different in these two families, as the resistivity shows almost no change at the magnetic transition in Sr2IrO4 and a significant change in Sr3Ir2O7.
EUROPEAN PHYSICAL JOURNAL B
(2023)
Article
Physics, Multidisciplinary
Tyler A. Cochran, Ilya Belopolski, Kaustuv Manna, Mohammad Yahyavi, Liu Yiyuan, Daniel S. Sanchez, Cheng Zi-Jia, Xian P. Yang, Daniel Multer, Yin Jia-Xin, Horst Borrmann, Alla Chikina, Jonas A. Krieger, Jaime Sanchez-Barriga, Patrick Le Fevre, Francois Bertran, Vladimir N. Strocov, Jonathan D. Denlinger, Chang Tay-Rong, Jia Shuang, Claudia Felser, Hsin Lin, Chang Guoqing, M. Zahid Hasan
Summary: In this Letter, the authors discovered the higher-fold topology of a chiral crystal using a combination of fine-tuned chemical engineering and photoemission spectroscopy. They identified all bulk branches of a higher-fold chiral fermion and revealed a multigap bulk boundary correspondence. This demonstration of multigap electronic topology will drive future research on unconventional topological responses.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Hideaki Iwasawa, Kazuki Sumida, Shigeyuki Ishida, Patrick Le Fevre, Francois Bertran, Yoshiyuki Yoshida, Hiroshi Eisaki, Andres F. Santander-Syro, Taichi Okuda
Summary: The role of spin-orbit interaction in high-T-c cuprates has been reexamined due to recent experimental observations of spin-polarized electronic states. However, the origin of spin polarization in these cuprates remains unclear due to the complexity of the reported spin texture. In this study, spin- and angle-resolved photoemission spectroscopy (ARPES) data on symmetric momentum points have been presented to explore the intrinsic spin nature of the initial state. The findings reveal a very weak spin polarization along the nodal direction and no indication of spin-splitting in the band, suggesting a need for a revision of the simple application of spin-orbit interaction in high-T-c cuprates.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
V. Palin, A. Anadon, S. Andrieu, Y. Fagot-Revurat, C. de Melo, J. Ghanbaja, O. Kurnosikov, S. Petit-Watelot, F. Bertran, J. -c. Rojas-Sanchez
Summary: This study explores a promising family of topological materials called half-Heuslers, which have high tunability and large spin Seebeck coefficient. The research findings provide a new pathway for the development of efficient spin interconversion materials.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Geoffroy Kremer, Aymen Mahmoudi, Meryem Bouaziz, Cleophanie Brochard-Richard, Lama Khalil, Debora Pierucci, Francois Bertran, Patrick Le Fevre, Mathieu G. Silly, Julien Chaste, Fabrice Oehler, Marco Pala, Federico Bisti, Abdelkarim Ouerghi
Summary: Metal monochalcogenides, such as InTe, exhibit diverse electronic properties based on their chemical composition, layer numbers, and stacking order. This study combined angle-resolved photoemission spectroscopy and density functional theory calculations to reveal the stability and properties of InTe. It was found that InTe has a tetragonal crystal structure, semiconducting behavior, and intrinsic p-type doping. The electronic band structure of InTe was highly anisotropic, with a large effective mass and in-plane anisotropy, making it interesting for electronic and thermoelectric applications.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Himanshu Lohani, Paul Foulquier, Patrick Le Fevre, Francois Bertran, Dorothee Colson, Anne Forget, Veronique Brouet
Summary: This study presents a direct observation of the evolution of the electronic structure of Co3Sn2S2 under different types of substitutions using angle-resolved photoemission spectroscopy. The results show clear shifts of selected bands, which are attributed to both doping and reduced magnetic splitting. Importantly, the effect of Fe and Ni substitutions cannot be accurately captured by density-functional theory calculations, indicating the importance of local behavior at the impurity site.
Article
Materials Science, Multidisciplinary
Ali El Boutaybi, Rebecca Cervasio, Alban Degezelle, Thomas Maroutian, Jean-Blaise Brubach, Valerie Demange, Ludovic Largeau, Marine Verseils, Sylvia Matzen, Guillaume Agnus, Laurent Vivien, Panagiotis Karamanis, Michel Rerat, Pascale Roy, Philippe Lecoeur
Summary: We experimentally and theoretically investigate ferroelectric thin films of ZrO2 using infrared absorption spectroscopy and density functional theory calculations. Theoretical investigations consider polar and non-polar phases, while experimental approaches involve direct growth and transfer of the films for IR measurements. The tetragonal phase under tensile strain and the non-polar to polar phase transition under compressive strain are observed. These findings provide new insights into the origin of ferroelectricity in ZrO2-based films.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Ali El Boutaybi, Panagiotis Karamanis, Thomas Maroutian, Sylvia Matzen, Laurent Vivien, Philippe Lecoeur, Michel Rerat
Summary: In this study, the Pockels electro-optic properties of ZrO2 and HfO2 orthorhombic Pbc21 and rhombohedral R3m ferroelectric phases are compared to those of the well-known rhombohedral R3c LiNbO3 Pockels material using density functional theory calculations. Three essential processes, including the electronic, ionic, and piezoelectric contributions, are explicitly investigated. The calculations reveal that the ionic part from the low-frequency phonon modes contributes the most to the electro-optic coefficients of LiNbO3, ZrO2, and HfO2, while the low-frequency phonon modes of ZrO2 and HfO2 rhombohedral R3m phase exhibit zero contribution to the Pockels coefficients.
Article
Materials Science, Multidisciplinary
Manali Vivek, Jacek Goniakowski, Andres Santander-Syro, Marc Gabay
Summary: Angle-resolved photoemission spectroscopy experiments have revealed the presence of a nanometer-thin two-dimensional electron system (2DES) on the (001)-oriented surface of CaTiO3, despite being a band insulator. Our ab initio study indicates that oxygen defects drive the metallicity, while tiltings and rotations of the oxygen octahedra significantly influence the electronic structure and response to external strain deformations of the 2DES. The conduction subbands near the center of the Brillouin zone exhibit a mixed t2g-eg orbital character. TiO2 surface divacancy configurations agree well with experimental spectra.
Article
Multidisciplinary Sciences
Cong Li, Jianfeng Zhang, Yang Wang, Hongxiong Liu, Qinda Guo, Emile Rienks, Wanyu Chen, Francois Bertran, Huancheng Yang, Dibya Phuyal, Hanna Fedderwitz, Balasubramanian Thiagarajan, Maciej Dendzik, Magnus H. Berntsen, Youguo Shi, Tao Xiang, Oscar Tjernberg
Summary: Using angle-resolved photoemission spectroscopy, the electronic structure of a noncentrosymmetric magnetic Weyl semimetal candidate NdAlSi was visualized, showing the emergence of new Weyl fermions in the ferrimagnetic state.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Meryem Bouaziz, Aymen Mahmoudi, Geoffroy Kremer, Julien Chaste, Cesar Gonzalez, Yannick J. Dappe, Francois Bertran, Patrick Le Fevre, Marco Pala, Fabrice Oehler, Jean-Christophe Girard, Abdelkarim Ouerghi
Summary: Recently, intriguing physical properties have been discovered in anisotropic semiconductors, where the non-uniformity of the in-plane electronic band structure often stems from low crystal symmetry. Atomic chains, which represent the ultimate downsizing limit for electronic materials, have emerged as a frontier in the field of one-dimensional quantum materials. Investigating the electronic and structural properties of chain-like InTe is crucial for understanding its applications in devices such as thermoelectrics. In this study, we employed scanning tunneling microscopy/scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations to directly observe the in-plane structural anisotropy in tetragonal InTe. Our results demonstrate the presence of one-dimensional In1+ chains in InTe and reveal a bandgap of approximately 0.40 +/- 0.02 eV located at the M point of the Brillouin zone. Additionally, we observed line defects in our sample, which were attributed to vacancies in the In1+ chains along the c-axis, a common feature in other TlSe-like compounds. Our STS and DFT findings confirm that the presence of In1+ induces a localized gap state near the valence band maximum, explaining the high intrinsic p-type doping of InTe that we also confirmed using angle-resolved photoemission spectroscopy.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Lama Khalil, Pietro Maria Forcella, Geoffroy Kremer, Federico Bisti, Julien Chaste, Jean-Christophe Girard, Fabrice Oehler, Marco Pala, Jean-Francois Dayen, Demetrio Logoteta, Mark Goerbig, Francois Bertran, Patrick Le Fevre, Emmanuel Lhuillier, Julien Rault, Debora Pierucci, Gianni Profeta, Abdelkarim Ouerghi
Summary: The electronic properties of alpha phase As2Te3 were investigated, revealing anisotropic 2D electronic states that are decoupled from the electronic structure of alpha-As2Te3 and attributed to single layer tellurene. This finding proposes the alpha-As2Te3 (100) surface as a promising platform for experimental exploration of the electronic band structure of single layer tellurene, which is otherwise difficult to access experimentally.
Article
Physics, Multidisciplinary
M. Blanco-Rey, R. Castrillo-Bodero, K. Ali, P. Gargiani, F. Bertran, P. M. Sheverdyaeva, J. E. Ortega, L. Fernandez, F. Schiller
Summary: The magnetic anisotropy and the electronic band structure are found to be interconnected in intermetallic compounds. The out-of-plane easy magnetization axis in EuAu2 is due to strong f-d band hybridization and Eu2+ valence, while the in-plane magnetization of GdAu2 is ruled by spin-orbit-split d bands, notably Weyl nodal lines occupied in the Gd3+ state. Regardless of the L value, a similar itinerant electron contribution to the anisotropy of analogous compounds is predicted.
PHYSICAL REVIEW RESEARCH
(2022)
