Article
Multidisciplinary Sciences
Yixiu Wang, Shiqiang Wei, Zheng-Hang Qi, Shuangming Chen, Kefu Zhu, Honghe Ding, Yuyang Cao, Quan Zhou, Changda Wang, Pengjun Zhang, Xin Guo, Xiya Yang, Xiaojun Wu, Li Song
Summary: In this study, NH4+-intercalated vanadium oxide (NH4+-V2O5) is designed as a cathode material for high-rate ZIBs. The insertion of NH4+ promotes electron transition to the 3dxy state of V t2g orbital in V2O5, leading to accelerated electron transfer and Zn-ion migration.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Correction
Physics, Multidisciplinary
W. S. Lee, Ke-Jin Zhou, M. Hepting, J. Li, A. Nag, A. C. Walters, M. Garcia-Fernandez, H. C. Robarts, M. Hashimoto, H. Lu, B. Nosarzewski, D. Song, H. Eisaki, Z. X. Shen, B. Moritz, J. Zaanen, T. P. Devereaux
Summary: The paper has been amended with a link provided for access at the top of the document.
Article
Chemistry, Multidisciplinary
Yang Liu, Yuchi Huo, Lin Zhu, Mingxing Jin, He Zhang, Suyu Li, Wei Hua, John Xiupu Zhang
Summary: This study experimentally investigates the conical emission induced by femtosecond vortex beams in water. The characteristics of the conical emission induced by two types of vortex beams are studied by recording the light spots of different spectra components. The study also discusses the transfer of optical angular momentum during the supercontinuum induced by the filamentation of femtosecond vortex beams.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Ceramics
Francisco L. Cumbrera, Bibi Malmal Moshtaghioun, Diego Gomez-Garcia, Angel L. Ortiz
Summary: Accurate determination of structural disorder in spinels is crucial but challenging. This study proposes constrained-restrained Rietveld refinements of X-ray diffraction patterns to quantify the disorder. Mathematical modeling is used to formulate the constraints and restraints to be imposed during the refinements. The method is successfully applied to analyze the structural disorder in two custom-made spinels.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Changlong Hu, Liang Li, Xiaolei Wen, Yuliang Chen, Bowen Li, Hui Ren, Shanguang Zhao, Chongwen Zou
Summary: In this study, manipulation of anisotropic electronic phase separation in a VO2 crystal film was achieved by injecting a He+ nanobeam, leading to direct visualization of nanoscale phase separation via infrared near-field imaging measurements. The results provide insights into understanding anisotropic nanoscale phase separation in strained metal oxide films.
APPLIED PHYSICS LETTERS
(2021)
Article
Clinical Neurology
Lucie Lefeuvre, Anna Caruso, Emmanuel Biver, Damien Fayolle
Summary: This article reports a case of orbital myositis triggered by alendronate. Diagnostic tests including magnetic resonance imaging and blood sample analyses were performed, and the symptoms were relieved after treatment. This case highlights the potential link between alendronate and orbital myositis, emphasizing the importance of early diagnosis.
EUROPEAN JOURNAL OF NEUROLOGY
(2023)
Article
Nanoscience & Nanotechnology
Ming-Wei Lin, Po-Hong Chen, Li-Chung Yu, Hung-Wei Shiu, Yu-Ling Lai, Su-Ling Cheng, Jeng-Han Wang, Der-Hsin Wei, Hong-Ji Lin, Yi-Ying Chin, Yao-Jane Hsu
Summary: This study investigates the magnetic behavior of a heterojunction consisting of a ferromagnetic nickel film and an organic semiconductor layer, revealing that the adsorption of the organic semiconductor layer not only reverses the magnetization direction but also enhances the magnetic ordering. It is found that the cyano group in the adsorbed organic semiconductor is spin-polarized and undergoes charge transfer with the nickel layer. Density functional theory calculations suggest that the experimentally observed spin polarization originates from the hybridization between the cyano group's pi orbitals and nickel's d band. These findings highlight the importance of the hybrid states at the organic-ferromagnet interface in tailoring the magnetic behavior.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
K. Li, J. Feng, W. Zhang, Z. Zhang, R. Xiong, Z. Lu
Summary: This study investigates the non-relativistic spin splitting phenomenon in vanadium dioxide (VO2) from a symmetric perspective, demonstrating that there is a tiny spin splitting in VO2 bulk, but a significant splitting can be achieved by modifying the hybridization of molecular orbital at the interface. The manipulation of interface and surface symmetries and the change in molecular orbital hybridization provide insights into the electronic structure and enhancement of spin splitting in VO2, enabling its potential application in spintronic devices.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Xu-jing Li, Bao-Tian Wang, Wen Yin
Summary: The discussions on the origins of the magnetic and insulating properties in LaCoO3 films have been ongoing. This study investigates the energy of different spin configurations using first principle calculations, considering various distortions in the films. The results show that the spin state transition can be controlled by rhombohedral distortion and octahedral rotations. The octahedral rotations can induce breathing or Jahn-Teller distortions, leading to a change in the electronic structure from metal to semiconductor. These findings highlight the importance of octahedral rotations in controlling the electronic structure and spin states in LaCoO3 films.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hiroki Ikegami, Yasunobu Nakamura
Summary: This research presents experimental investigations of transport properties in the insulating phase of two-dimensional Josephson-junction arrays (JJAs). The results indicate that the JJAs exhibit nonlinear current-voltage characteristics at low temperatures, and the crossover temperature to the insulating phase and the phase diagram in the insulating side are determined through the analysis of nonlinearity.
Article
Chemistry, Physical
Lipika Baidya, Govardhan Reddy
Summary: Aggregation of intrinsically disordered proteins (IDPs) is linked to neurodegenerative diseases. In this study, computer simulations were used to investigate the effect of acidic pH on the conformation of a specific protein. It was found that low pH induces compaction in the protein's dimensions, particularly in the region rich in glutamic acid residues, leading to increased β-sheet content. Conformations with high β-sheet content were observed to nucleate the aggregation process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Astronomy & Astrophysics
Adrian Dumitru, Risto Paatelainen
Summary: The light-front wave function of a proton and the color charge density correlator were calculated, revealing the presence of soft and collinear singularities. Despite the singularities, the correlator was shown to satisfy the Ward identity and be independent of the renormalization scale when accurate gluon emission and absorption vertices were employed. These findings provide important initial conditions for the Balitsky-Kovchegov evolution of the dipole scattering matrix.
Article
Materials Science, Ceramics
Lu Liu, Congmian Zhen, Lei Xu, Jingtong Xie, Li Ma, Hongxia Bu, Dewei Zhao, Denglu Hou
Summary: The study found that the oxidation state of NiCo2S4 powders significantly impacts their magnetic properties and lattice structure. Partial oxidation leads to ferromagnetism between intermediate spin Co3+ and Ni ions, while heavy oxidation reduces Co3+ to Co2+ and induces antiferromagnetic exchange interactions between Ni3+ ions. However, regardless of the oxidation degree, all NiCo2S4 samples exhibit metallic conductivity.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Florence Grenapin, Alessio D'Errico, Ebrahim Karimi
Summary: Some anisotropic materials form semicrystalline structures called spherulites, which exhibit a characteristic maltese-cross-like pattern when observed in a polarisation microscope. These patterns are associated with a strong light's spin-orbit coupling induced by the spherulite structures. Experimental demonstrations using crystallized ascorbic acid samples show the creation of optical vortices in transmitted laser beams and the formation of inhomogeneous polarisation patterns. These findings suggest potential applications of spherulites based on other materials in challenging tasks of polarisation and spatial shaping of electromagnetic radiation, especially in the THz domain.
Article
Mathematics, Applied
Eric Thoma
Summary: In this paper, we prove several important results for the Coulomb gas in any dimension, including the high-density Jancovici-Lebowitz-Manificat law, the existence of microscopic limiting point processes, upper bounds on the k-point correlation function, and the extension of the perfect-freezing regime to higher dimensions. We also give positive charge discrepancy bounds near the droplet boundary and prove incompressibility of Laughlin states in the fractional quantum Hall effect.
COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS
(2023)
Article
Physics, Multidisciplinary
Shun Okumura, Satoru Hayami, Yasuyuki Kato, Yukitoshi Motome
Summary: Investigated the spin texture of the hedgehog lattice in centrosymmetric cubic metals and found differences in stability, magnetic properties, and topological characteristics compared to noncentrosymmetric systems. The hedgehog lattice transitions into topologically-trivial conical states with increasing magnetic fields.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Materials Science, Multidisciplinary
Masashi Miura, Go Tsuchiya, Takumu Harada, Keita Sakuma, Hodaka Kurokawa, Naoto Sekiya, Yasuyuki Kato, Ryuji Yoshida, Takeharu Kato, Koichi Nakaoka, Teruo Izumi, Fuyuki Nabeshima, Atsutaka Maeda, Tatsumori Okada, Satoshi Awaji, Leonardo Civale, Boris Maiorov
Summary: The addition of artificial pinning centers has greatly increased the critical current density of superconductors, allowing for breakthroughs in all-superconducting magnets and other applications. By modifying certain parameters such as carrier density and chemical pressure, the critical current density can be further enhanced.
NPG ASIA MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Satoru Hayami, Yasuyuki Kato
Summary: We numerically study the stabilization mechanisms of skyrmion crystals in itinerant centrosymmetric tetragonal magnets under thermal fluctuations and external magnetic field. By employing a efficient steepest descent method, we construct the magnetic field-temperature phase diagrams of the effective spin model based on a two-dimensional square lattice. Our results show that a square-type skyrmion crystal can be stabilized by high-harmonic wave-vector interaction or biquadratic interaction under an external magnetic field. We also find other stable multiple-Q states in the phase diagram.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Kiyu Fukui, Yasuyuki Kato, Yukitoshi Motome
Summary: The Kitaev model, originally defined on a 2D honeycomb lattice, can be extended to tricoordinate lattices in any spatial dimensions. This study investigates the Kitaev-Heisenberg model on a 3D hyperhoneycomb lattice using the pseudofermion functional renormalization group method. The results reveal a ground-state phase diagram that includes both quantum spin liquid and magnetically ordered phases, similar to the 2D honeycomb case. These findings provide insights for the search of hyperhoneycomb Kitaev materials.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Multidisciplinary Sciences
Kohei Fujiwara, Yasuyuki Kato, Hitoshi Abe, Shun Noguchi, Junichi Shiogai, Yasuhiro Niwa, Hiroshi Kumigashira, Yukitoshi Motome, Atsushi Tsukazaki
Summary: Amorphous semiconductors are widely used in electronic and energy-conversion devices. This study reveals that the short-range crystalline order in amorphous Fe-Sn films contributes to anomalous electrical and magneto-thermoelectric properties. This finding sheds light on the topology of amorphous materials and may enable the realization of functional topological amorphous electronic devices.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yasuyuki Kato, Yukitoshi Motome
Summary: Topological defects known as magnetic hedgehogs can produce emergent magnetic monopoles, which are not observed in ordinary electromagnetism. We propose a theoretical model that can stabilize both tetrahedral and cubic hedgehog lattices and study the phase diagram with changes in interaction parameters, magnetic field, and temperature. We find various topological transitions, some of which exhibit singular behavior in thermodynamic quantities.
Correction
Materials Science, Multidisciplinary
Yasuyuki Kato, Takahiro Misawa
Article
Materials Science, Multidisciplinary
Kiyu Fukui, Yasuyuki Kato, Joji Nasu, Yukitoshi Motome
Summary: In this study, we investigated the spin-S Kitaev-Heisenberg models and found that quantum spin liquid phases are more stable compared to ordered phases in high spin cases.
Article
Materials Science, Multidisciplinary
Yasuyuki Kato, Yukitoshi Motome
Summary: Multiple-Q magnetic orderings, characterized by the superposition of multiple spin density waves or spin spirals, have attracted significant attention due to their potential topological and emergent electromagnetic properties. However, elucidating the phase diagrams for these magnetic orderings has been challenging due to the lack of concise theoretical tools and appropriate microscopic models. In this study, we propose a theoretical framework based on effective spin models with long-range magnetic interactions mediated by conduction electrons. Our framework, which utilizes the steepest descent method and self-consistent equations, provides exact solutions and has advantages over existing methods. We demonstrate the versatility of our framework by studying models with triple- and hextuple-Q magnetic orderings and clarify the magnetic field-temperature phase diagrams. Our results show interesting reentrant phase transitions and the existence of topologically nontrivial stacked skyrmion crystals or hedgehog lattices. Overall, our framework provides a powerful tool for studying multiple-Q magnetic orderings and related quantum phenomena in real magnetic metals.
Article
Materials Science, Multidisciplinary
Kiyu Fukui, Yasuyuki Kato, Joji Nasu, Yukitoshi Motome
Summary: In this study, the effects of Kitaev-type interactions on ultracold polar molecules were investigated using the pseudofermion functional renormalization group method. The results show that regardless of the spatial anisotropy of the interactions, the ground state exhibits magnetic order, and the case with isotropic interactions is closest to realizing the Kitaev quantum spin liquid. By introducing a cutoff in the interaction range, it was shown how the long-range interactions destroy the Kitaev quantum spin liquid.
Article
Materials Science, Multidisciplinary
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato, Yukitoshi Motome
Summary: This study systematically analyzes the magnetic and topological properties of multiple-Q spin textures with phase degree of freedom in two and three dimensions. It establishes a generic framework to handle phase shifts in such textures. The results show that phase shifts and magnetization changes can lead to the formation of skyrmion lattices with different skyrmion numbers, impacting the topological aspects of the structures.
Article
Materials Science, Multidisciplinary
Luc Testa, Peter Babkevich, Yasuyuki Kato, Kenta Kimura, Virgile Favre, Jose A. Rodriguez-Rivera, Jacques Ollivier, Stephane Raymond, Tsuyoshi Kimura, Yukitoshi Motome, Bruce Normand, Henrik M. Ronnow
Summary: We report high-resolution single-crystal inelastic neutron scattering measurements on the spin-1/2 antiferromagnet Ba(TiO)Cu-4(PO4)(4). The measurements reveal a complex mode structure with multiple characteristic features, allowing us to model the relevant magnetic interactions. Our findings demonstrate the importance of the intraplaquette DM interaction in enforcing robust magnetic order and opening a large gap at the Brillouin-zone center.
Article
Materials Science, Multidisciplinary
Kazuki Nakazawa, Yasuyuki Kato, Yukitoshi Motome
Summary: This article presents theoretical results on the Majorana band structure and thermal transport properties in the Kitaev honeycomb model under a staggered magnetic field in addition to a uniform one. It is found that the asymmetric deformation of the Majorana band leads to nonreciprocal thermal transport, and the field dependence of the thermal conductivity is correlated with the magnitude of the Majorana gap and the asymmetry of the Majorana excitation spectra. The estimates of thermal currents are shown, and it is discussed that the linear response is experimentally measurable while improvement is needed for observing the nonlinear one.
Article
Astronomy & Astrophysics
Petr A. Mishchenko, Yasuyuki Kato, Yukitoshi Motome
Summary: The study introduces a quantum Monte Carlo method on asymptotic Lefschetz thimbles to alleviate the sign problem in quantum many-body systems simulations by shifting the integration domain for auxiliary fields. The method is extended to quantum spin models with generic two-spin interactions, successfully applied to the Kitaev model to predict a topological quantum spin liquid with non-Abelian anyonic excitations, and obtained unbiased numerical results with high precision in low-temperature region in a magnetic field.
Article
Physics, Multidisciplinary
Mitsuru Akaki, Kenta Kimura, Yasuyuki Kato, Yuya Sawada, Yasuo Narumi, Hitoshi Ohta, Tsuyoshi Kimura, Yukitoshi Motome, Masayuki Hagiwara
Summary: Magnetic excitations in magnetoelectric multiferroics can be induced by the oscillation of electric polarization, causing nonreciprocal optical phenomena. Resonance modes observed in energy diagrams within specific magnetic field and frequency ranges were partially reproduced through numerical analysis. Additionally, it was found that electron spin resonance signals on some modes can be modulated by applying an electric field.
PHYSICAL REVIEW RESEARCH
(2021)
