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288 results on '"Hashimoto, Teruo"'

6. Interfacial ferroelectricity in marginally twisted 2D semiconductors

Author

Weston, Astrid, Castanon, Eli G, Enaldiev, Vladimir, Ferreira, Fabio, Bhattacharjee, Shubhadeep, Xu, Shuigang, Corte-Leon, Hector, Wu, Zefei, Clark, Nickolas, Summerfield, Alex, Hashimoto, Teruo, Gao, Yunze, Wang, Wendong, Hamer, Matthew, Read, Harriet, Fumagalli, Laura, Kretinin, Andrey V, Haigh, Sarah J., Kazakova, Olga, Geim, A. K., Fal'ko, Vladimir I., and Gorbachev, Roman

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

Twisted heterostructures of two-dimensional crystals offer almost unlimited scope for the design of novel metamaterials. Here we demonstrate a room-temperature ferroelectric semiconductor that is assembled using mono- or few- layer MoS2. These van der Waals heterostructures feature broken inversion symmetry, which, together with the asymmetry of atomic arrangement at the interface of two 2D crystals, enables ferroelectric domains with alternating out-of-plane polarisation arranged into a twist-controlled network. The latter can be moved by applying out-of-plane electrical fields, as visualized in situ using channelling contrast electron microscopy. The interfacial charge transfer for the observed ferroelectric domains is quantified using Kelvin probe force microscopy and agrees well with theoretical calculations. The movement of domain walls and their bending rigidity also agrees well with our modelling results. Furthermore, we demonstrate proof-of-principle field-effect transistors, where the channel resistance exhibits a pronounced hysteresis governed by pinning of ferroelectric domain walls. Our results show a potential venue towards room temperature electronic and optoelectronic semiconductor devices with built-in ferroelectric memory functions., Comment: 15 pages, 3 figures

Published
2021
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8. Intrinsic Hippocampal Functional Connectivity Underlying Rigid Memory in Children and Adolescents with Autism Spectrum Disorder: A Case-Control Study

Author

Hashimoto, Teruo, Yokota, Susumu, Matsuzaki, Yutaka, and Kawashima, Ryuta

Abstract

Atypical learning and memory in early life can promote atypical behaviors in later life. Less relational learning and inflexible retrieval in childhood may enhance restricted and repeated behaviors in patients with autism spectrum disorder. The purpose of this study was to elucidate the mechanisms of atypical memory in children with autism spectrum disorder. We conducted picture-name pair learning and delayed-recognition tests with two groups: one group with high-functioning autism spectrum disorder children (aged 7-16, n = 41) and one group with typically developing children (n = 82) that matched the first group's age, sex, and IQ. We assessed correlations between successful recognition scores and seed-to-whole-brain resting-state functional connectivity. Although both learning and retrieval performances were comparable between the two groups, we observed slightly lower category learning and significantly fewer memory gains in the autism spectrum disorder group than in the typically developing group. The right canonical anterior hippocampal network was involved in successful memory in youths with typically developing, while other memory systems may be involved in successful memory in youths with autism spectrum disorder. Context-independent and less relational memory processing may be associated with fewer memory gains in autism spectrum disorder. These atypical memory characteristics in autism spectrum disorder may accentuate their inflexible behaviors in some situations.

Published
2021
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11. Interfacial ferroelectricity in marginally twisted 2D semiconductors

Author

Weston, Astrid, Castanon, Eli G., Enaldiev, Vladimir, Ferreira, Fábio, Bhattacharjee, Shubhadeep, Xu, Shuigang, Corte-León, Héctor, Wu, Zefei, Clark, Nicholas, Summerfield, Alex, Hashimoto, Teruo, Gao, Yunze, Wang, Wendong, Hamer, Matthew, Read, Harriet, Fumagalli, Laura, Kretinin, Andrey V., Haigh, Sarah J., Kazakova, Olga, Geim, A. K., Fal’ko, Vladimir I., and Gorbachev, Roman

Published
2022
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19. Development of high resolution 2D and 3D electron-based imaging techniques for materials study

Author

Hashimoto, Teruo

Subjects
620.1
Abstract

Since the establishment of electron microscopy in natural science, the two dimensional (2D) visualized information has been seen as critical evidence of phenomena to contribute in many research fields. However, specifically, in the study of corrosion of metallic materials, corrosion develops via unpredicted pathways into the materials. Thus, capturing the overall phenomena only by 2D visualization renders it difficult to disclose in detail the determination factors of the corrosion path and the relationship between the corrosion and the surrounding microstructure. Therefore, development of three dimensional (3D) visualization methods is desired in this field. The combined techniques associating ultramicrotomy and low voltage scanning electron microscopy (SEM) with selective detection of backscattered electrons have been successfully developed, which is capable of generating sequential images yielding a stack of information generated equidistantly through the volume of interest, which allows construction of 3D images. This provides structural information that is previously unobtainable with conventional 2D techniques and other 3D techniques. This innovative approach can routinely achieve significantly improved depth and lateral resolutions and atomic number contrast (Z-contrast) sensitivity. However, during the slicing and image capturing process artefacts are often introduced since the microstructure on the block face is distorted due to applying of mechanical force by the diamond knife onto the block face. This might cause misleading results or misinterpretation of the microstructure of the material. Thus, the correction of the artefact introduced by the slicing process is critically important in image processing. Further, by the optimisation of the knife angle, oscillation and cutting speed, minimum damage block faces are able to be generated. The optimized 3D imaging technique with sub-nanometre spatial resolution developed by the Author, in combination with transmission electron microscopy has been successfully employed for the study of metallic materials degradation mechanisms. The understanding of the corrosion mechanism of copper-containing aluminium alloy AA2024 has been advanced. The initiation of corrosion is found to be associated with the S phase (Al2CuMg), which changes to copper-enriched sponge like structure through selective dissolution of electrochemically more active elements magnesium and aluminium. The 3D imaging technique combined with high resolution TEM has revealed the progress of dealloying of S phase particles in details, including morphological, compositional and structural changes at all length scales. The 3D imaging technique has also been successfully employed to study the copper enrichment phenomenon during corrosion and oxidation of copper-containing aluminium alloys. It is found that the preferential oxidation of aluminium atoms takes place at the corrosion front and, consequently, copper enriched layers are formed immediately beneath the corrosion products. Further, a copper-containing binary aluminium alloy after anodizing in ammonium pentaborate is used for identifying the crystal structure of the copper-enriched layer.

Published
2017

40. The degradation mechanism of a marine coating under service conditions of water ballast tank

Author

Iannarelli, Paul, primary, Beaumont, Douglas, additional, Liu, Yanwen, additional, Zhou, Xiaorong, additional, Burnett, Timothy L., additional, Curioni, Michele, additional, Lyon, Stuart B, additional, Gibbon, Simon R, additional, Morsh, Suzanne, additional, Emad, Seyedgholamreza, additional, Hashimoto, Teruo, additional, and Hijnen, Niek, additional

Published
2022
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44. Interfacial ferroelectricity in marginally twisted 2D semiconductors

Author

Weston, Astrid, primary, Castanon, Eli, additional, Enaldiev, Vladimir, additional, Ferreira, Fabio, additional, Bhattacharjee, Shubhadeep, additional, Xu, Shuigang, additional, Corte-León, Héctor, additional, Wu, Zefei, additional, Clark, Nicholas, additional, Summerfield, Alex, additional, Hashimoto, Teruo, additional, Gao, Yunze, additional, Wang, Wendong, additional, Hamer, Matthew, additional, Read, Harriet, additional, Fumagalli, Laura, additional, Kretinin, Andrey, additional, Haigh, Sarah, additional, Kazakova, Olga, additional, Geim, Andre, additional, Fal'ko, Vladimir, additional, and Gorbachev, Roman, additional

Published
2021
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