Article
Physics, Multidisciplinary
R. Cardman, G. Raithel
Summary: This study develops and demonstrates a spectroscopic method for Rydberg-Rydberg transitions using a phase-controlled laser field. The method enables the detection of Rydberg transitions with less-restrictive selection rules and provides Doppler-free spectra with narrow linewidths. This new method opens up possibilities for high-precision spectroscopy and qubit manipulation in Rydberg-based systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Moaz Waqar, Haijun Wu, Khuong Phuong Ong, Huajun Liu, Changjian Li, Ping Yang, Wenjie Zang, Weng Heng Liew, Caozheng Diao, Shibo Xi, David J. Singh, Qian He, Kui Yao, Stephen J. Pennycook, John Wang
Summary: In this study, the authors demonstrate a giant electric-field-induced strain in alkali niobate epitaxial thin films with self-assembled planar faults and elucidate its origin. The findings have important implications for developing high-performance sensors and actuators.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Ping Wang, Ding Wang, Shubham Mondal, Yuanpeng Wu, Tao Ma, Zetian Mi
Summary: This study presents a unique approach, called interfacial modulated lattice-polarity-controlled epitaxy (IMLPCE), to overcome the challenges in achieving III-nitride heterostructures with controlled lattice-polarity on silicon substrates. It provides an alternative method for seamlessly integrating III-nitrides with mature Si-based device technology.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Dylan G. Boucher, Kara Kearney, Elif Ertekin, Michael J. Rose
Summary: The efficiency of photoelectrochemical (PEC) devices depends heavily on the energetics and band alignment of the semiconductor overlayer junction, which can be controlled through molecular functionalization. By covalently attaching aryl surface modifiers, high-fidelity surfaces with low defect densities were achieved, resulting in systematically shifted band edges and high photoelectrochemical performance. DFT calculations showed that the organic-functionalized interfaces effectively hybridized with the silicon band edges, introducing a positive interfacial dipole and decreasing the potential drop across the semiconductor.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Jaroslav Manis, Jindrich Mach, Miroslav Bartosik, Tomas Samoril, Michal Horak, Vojtech Calkovsky, David Nezval, Lukas Kachtik, Martin Konecny, Tomas Sikola
Summary: As the dimensions of modern devices shrink, two-dimensional structures become a promising solution for optoelectronic and spintronic applications. In this study, a new low-temperature droplet epitaxy method was used to fabricate unique 2D GaN nanostructures on the Si(111) surface, and various characterization techniques were employed to study these structures in detail.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Physical
Piu Rajak, Regina Ciancio, Antonio Caretta, Simone Laterza, Richa Bhardwaj, Matteo Jugovac, Marco Malvestuto, Paolo Moras, Roberto Flammini
Summary: We conducted a study on the sub-nanometer interlayer of crystalline silicon nitride at the Ni/Si interface, examining its role as a barrier against atom diffusion using transmission electron microscopy measurements and energy dispersive X-ray analysis. The results revealed that discontinuous silicide areas can be formed just below the nitride layer, with composition matching that of the nickel disilicide. This reaction between nickel and silicon is believed to be caused by thermal strain experienced by the interface during the deposition of nickel at low temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Alejandro Perez Paz, Angel Rubio
Summary: This study systematically investigates the submonolayer coverage of alkali atoms (Na, K, Cs) on hydrated Cu(111) surface with different water molecule concentrations. The results show a gradual detachment of alkali from the surface with increasing hydration, leading to a linear decrease in charge transfer to the substrate. Furthermore, the orientation of water dipoles towards the surface causes a gradual increase in the substrate's work function as the number of coordinated water molecules increases.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Multidisciplinary
Yudai Sato, Masahiro Haze, Ryohei Nemoto, Wenxuan Qian, Shunsuke Yoshizawa, Takashi Uchihashi, Yukio Hasegawa
Summary: Unlike bulk superconductors, the superconductivity of Pb atomic layers on vicinal substrates is affected by surface steps. The critical temperature is reduced and the critical magnetic field is enhanced. Scanning tunneling microscopy reveals elongated vortices along the steps due to the reduced coherence length, which demonstrates that the steps act as disorder. Vicinal substrates provide a unique platform to manipulate the degree of disorder on 2D superconductors.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Xianbing Miao, Zhen Peng, Lei Shi, Shiming Zhou
Summary: By codoping nonprecious Cr, W, and Cu elements into a RuIr-mixed oxide lattice, we have developed a high-entropy rutile (Ru0.2Ir0.2Cr0.2W0.2Cu0.2)O2 catalyst for acidic water oxidation. This catalyst exhibits a low overpotential, excellent stability, and high mass activity, surpassing most reported Ru-based catalysts. Multielement doping inhibits the coarsening of crystalline grains and increases active surface areas, while metal-insulator transition weakens the Ru-O bonding strength and enhances intrinsic activity.
Article
Materials Science, Multidisciplinary
Youngoh Kim, Joonmyung Choi
Summary: Aluminum oxide growth mechanism and film properties were examined on Al (100), (110) and (111) surfaces using molecular dynamics simulations. While Al (110) showed the highest growth rate and oxygen adsorption rate due to its unstable surface and high surface energy, the reaction energy eventually converged with Al (100) and (111) as oxidation progressed. The high anisotropic residual stress in the oxide layer on Al (110) was attributed to its high surface energy and anisotropic surface structure.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Physics, Applied
Basanta Roul, Deependra Kumar Singh, Rohit Pant, Arun Malla Chowdhury, K. K. Nanda, S. B. Krupanidhi
Summary: This study presents a detailed report on the modulation of electrical properties of VO2/Si heterostructures by applying an external electrical field across VO2 thin films. The results show a reversible semiconductor-to-metal transition and hysteresis loop in the resistance of the device around the transition temperature of the VO2 thin film. Additionally, significant changes in junction current were observed when an external bias was applied on the VO2 thin film, demonstrating the potential for external control of electrical transport in vertical heterostructures.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Ronghao Wang, Kaiwen Sun, Yuhao Zhang, Bingqin Li, Chengfei Qian, Jingfa Li, Fangyang Liu, Weizhai Bao
Summary: All-solid-state metal batteries (ASSMBs) are seen as the ideal choice for next-generation high-energy storage systems due to their high specific capacity and low redox potential. However, their uncontrollable chemical reactivity, low coulombic efficiency, and safety concerns limit their practical applications. Crystallographic optimization provides a solution for inhibiting dendrite growth in metal anodes and has been studied in various types of all-solid-state batteries. The challenges and prospects for future design and engineering of crystallographic optimization for solid-state electrolytes are discussed.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Joseph M. Gurrentz, Michael J. Rose
Summary: Polyoxometalates (POMs) have been investigated as multiredox components in functional molecular materials, and an improved approach for covalent POM immobilization on high-quality silicon surfaces has been demonstrated. The POM-modified Si electrodes showed multiple redox transitions and high-quality electronic properties, with potential for photoelectrochemical applications. The study provides insights into the thermodynamic interplay between the Si substrate and POM molecular overlayer in defining the functional outcome of the Si|POM system.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Zhenyi Huang, Huaqin Huang, Hao He, Zhaoyang Wu, Xuesong Wang, Rui Wang
Summary: In this study, four types of iron-based soft magnetic composites (SMCs) were prepared using different metal oxide substrates. The differences in microscopic morphology and magnetic properties were investigated. The results showed that using ZrO2 as the insulation layer resulted in the highest resistivity, lowest total loss, and lowest eddy current loss, with the permeability stabilizing earlier at lower frequencies.
Article
Chemistry, Inorganic & Nuclear
Panpan Yang, Huancheng Hu, Shui Yu, Dongcheng Liu, Yuning Liang, Huahong Zou, Fupei Liang, Zilu Chen
Summary: The newly developed alkali-resistant single-molecule magnet material has a unique structure and magnetic properties, remaining stable in alkaline solutions. Magnetic measurements revealed it to be an SMM, which will help broaden the research perspective on preparing SMM materials with excellent chemical stability.
INORGANIC CHEMISTRY
(2021)
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
Physics, Multidisciplinary
F. Ming, X. Wu, C. Chen, K. D. Wang, P. Mai, T. A. Maier, J. Strockoz, J. W. F. Venderbos, C. Gonzalez, J. Ortega, S. Johnston, H. H. Weitering
Summary: Adatoms on a Si(111) substrate form a triangular lattice with unpaired electrons. Doping the Sn layer results in a superconducting state, which may exhibit chiral d-wave symmetry. Experiments confirm a doping-dependent critical temperature, fully gapped order parameter, time-reversal symmetry breaking, and enhanced zero-bias conductance near superconducting domain edges.
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)
Editorial Material
Instruments & Instrumentation
A. F. Campos, K. Wang, T. Duden, A. Tejeda
Summary: We responded to Donath et al.'s comment on our setup, which allows full 3D control of electron beam polarization in an IPES experiment, an improvement over previous setups with limited control. They claimed our setup operated incorrectly by comparing their treated results with our untreated spectra. However, we compared our results with literature and reproduced previous findings, supporting the validity of our setup. We also addressed their concern about background changes during spin tuning and argued that it is irrelevant to IPES. Overall, our original setup's operation is fully demonstrated.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Spectroscopy
Min- Lee, S. Ayaz Khan, J. Minar, A. Tejeda
Summary: In this study, we calculated the photoemission spectra of MAPI at the main photon energies available in conventional laboratories (He I -21.2 eV, He II -40.8 eV) using fully relativistic Spin-Polarized Relativistic Korringa-Kohn-Rostoker (SPRKKR) calculations. We also investigated the effects of s and p polarization on the calculated spectra. These findings provide valuable insights into photoemission measurements on MAPI.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(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
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
Chemistry, Multidisciplinary
Leo Bossard-Giannesini, Luis Cardenas, Herve Cruguel, Aude Demessence, David Loffreda, Olivier Pluchery
Summary: Self-assembled monolayers composed of various long-chain aliphatic molecules and different tail functional groups have been synthesized and characterized on the Au(111) surface. The study shows that the chain length and tail group of the aliphatic molecules have a significant impact on the electronic properties of the self-assembled monolayers.
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
M. N. Nair, I. Palacio, A. Mascaraque, E. G. Michel, A. Taleb-Ibrahimi, A. Tejeda, C. Gonzalez, A. Martin-Rodero, J. Ortega, F. Flores
Summary: This study reports an experimental and theoretical investigation of the electron-phonon coupling in α-Sn/Ge(111). The results show the presence of a significant electron-phonon interaction in a specific phase of α-Sn/Ge(111), which may play a role in the formation of different phases at low temperatures.
