Article
Optics
Ricardo A. Fiallo, Mark W. Horn, Akhlesh Lakhtakia
Summary: By utilizing the circular Bragg phenomenon exhibited by chiral sculptured thin films (CSTFs), thin-film structures with polarization-universal bandgaps have been fabricated. These bandgaps have center wavelengths close to those of the circular Bragg phenomenon in CSTFs, but are considerably narrower.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ying Li, Cheng Xiang, Francesco M. Chiabrera, Shinhee Yun, Haiwu Zhang, Daniel J. Kelly, Rasmus T. Dahm, Charline K. R. Kirchert, Thomas E. Le Cozannet, Felix Trier, Dennis Christensen, Timothy J. Booth, Soren B. Simonsen, Shima Kadkhodazadeh, Thomas S. Jespersen, Nini Pryds
Summary: Oxide stacking structures can be customized by controlling the stacking sequence and twist angle between layers to form different moire patterns with atomic sharp interfaces. This approach opens up new avenues for fabricating artificial 3D oxide stacking heterostructures.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Jundong Song, Yusuke Iguchi, Kazuki Okamoto, Osami Sakata, Masahito Yoshino, Takanori Nagasaki, Tomoaki Yamada
Summary: This study fabricated artificial superlattice thin films with alternative PST and SrTiO3 layers using pulsed laser deposition. The measurement of electrical response with time-resolved synchrotron x-ray diffraction revealed that the reorientation of dipole moments in the vortex domains is susceptible to the applied electric field and can be reversed.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Mohammad Moein Seyfouri, Dawei Zhang, Cesar Menendez, Daniel Sando, Qi Zhang, Claudio Cazorla, Jan Seidel, Danyang Wang
Summary: This study investigates the thickness-dependent structural phase transitions in epitaxial BFCO films and reveals the influence of crystallographic distortions on their photoresponse. The results show a shift in bandgap and absorption onset due to the changes in crystal symmetry. First-principles calculations further elucidate the impact of crystallographic symmetry on the electronic structure. This work provides a practical strategy for engineering optoelectronic properties of multiferroic oxide films through thickness-induced phase transitions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Yuji Noguchi, Hiroki Matsuo
Summary: The superlattice consisting of Mn(5%)-doped BiFeO3 and BaTiO3 layers grown on SrTiO3 substrates shows different behaviors based on the number of unit cells in the layers. Superlattices with fewer than 5 unit cells behave as a unified ferroelectric, while those with more than 25 unit cells behave as a simple series connection of individual capacitors. Density functional theory calculations explain the spontaneous polarization behavior in these thin superlattices and suggest the potential for novel ferroelectrics with different crystal symmetries.
Article
Nanoscience & Nanotechnology
Ricardo A. Fiallo, Akhlesh Lakhtakia, Mark W. Horn
Summary: Equichiral sculptured thin films (ECSTFs) with polarization-universal Bragg phenomenon were fabricated using asymmetric serial bideposition. The polarization-universal bandgaps of the ECSTFs can be tuned by adjusting the angle of incidence.
JOURNAL OF NANOPHOTONICS
(2022)
Article
Chemistry, Multidisciplinary
Mao Ye, Songbai Hu, Yuanmin Zhu, Yubo Zhang, Shanming Ke, Lin Xie, Yuan Zhang, Sixia Hu, Dongwen Zhang, Zhenlin Luo, Meng Gu, Jiaqing He, Peihong Zhang, Wenqing Zhang, Lang Chen
Summary: The study discusses the fabrication of superlattices with reversible polarization switching in an atomically thin metallic layer, showcasing a novel 2D ferroelectric-like metal. Through various analyses, the coexistence of 2D metallicity and electric polarization phenomena in the SrRuO3 layer is unveiled, providing insights into the unique coexisting properties manipulated by external fields.
Article
Materials Science, Multidisciplinary
Chaolumen Wu, Yadong Yin
Summary: Inorganic nanowires and semiconductor quantum dots are assembled into chiral photonic crystals, which can generate circularly polarized luminescence with significant dissymmetry factor and adjustable peak position, intensity, and sign by controlling the photonic crystals' properties.
Article
Materials Science, Multidisciplinary
Rui Tang, Rui He, Sangmo Kim, Chung Wung Bark
Summary: By controlling the doping, the bandgap of ferroelectric complex oxide films can be effectively reduced, improving their absorption of visible light and increasing the photocurrent density. This simple doping technique can be applied in photovoltaic energy conversion or optoelectronic devices.
Article
Materials Science, Multidisciplinary
Rui Tang, Rui He, Sangmo Kim, Chung Wung Bark
Summary: Driven by the demand for renewable and clean energy, this study investigated the photovoltaic effect of various solar cells and materials. By modifying the BLT and Co-BLT composites with FeCo-BLT films, the bandgap was narrowed and visible light absorption was increased, resulting in improved photovoltaic power generation performance. The modified double-ferroelectric, thin-film composites showed superior optoelectronic properties and enhanced current density, indicating improved efficiency of ferroelectric thin-film photovoltaic reactions.
Article
Physics, Applied
Hiroaki Shishido, Akira Okumura, Tatsuya Saimyoji, Shota Nakamura, Shigeo Ohara, Yoshihiko Togawa
Summary: Thin films of a heavy fermion chiral magnet YbNi3Al9 were grown using molecular beam epitaxy, exhibiting similar characteristics to bulk samples, including typical Kondo system features and chiral helimagnetic ordering features. The shift in the magnetoresistance curve associated with field-induced phase transition and the magnetic phase diagram reproduce those observed in bulk crystals.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Haoyi Qiu, Catarina Schmidt, Jurgen Carstensen, Soren Kaps, Rainer Adelung
Summary: A simple and environmentally friendly approach is demonstrated to enhance the adhesion between nonstick polymers through mechanical interlocking using nanoscale-sculptured Al microparticles. This method significantly increases peeling strength and creates tight and strong hierarchical mechanical interlocking between the polymers.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Zihan Liang, Xin Zhou, Le Zhang, Xiang-Long Yu, Yan Lv, Xuefen Song, Yongheng Zhou, Han Wang, Shuo Wang, Taihong Wang, Perry Ping Shum, Qian He, Yanjun Liu, Chao Zhu, Lin Wang, Xiaolong Chen
Summary: The authors demonstrate the bulk photovoltaic effect (BPVE) at the edges of 2D semiconductors embedded in various van der Waals heterostructures, which offer a promising approach for improving the efficiency of energy harvesting. The observed BPVE-induced photocurrents strongly depend on the orientation of the edge-embedded structures and the polarization of incident light. This study not only visualizes the unique optoelectronic effect in van der Waals nano edges, but also provides an effective strategy for achieving BPVE in engineered structures.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
A. K. Sahoo, Manas R. Panigrahi
Summary: Bismuth magnesium oxide (BMO) thin films prepared using an unconventional sol-gel method exhibited single-phase structure and excellent optical properties after annealing. Comparison with existing literature showed superior optical parameters of the films.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Xuanhao Wang, An Pan, Tingan Li, Cheng Zeng, Jinsong Xia
Summary: Thin-film lithium niobate coherent modulators have shown promise for the next generation coherent communication system, with high-performance polarization splitter-rotators (PSRs) being crucial for achieving dual polarization coherent modulators. A PSR demonstrated on the lithium niobate on insulator (LNOI) platform has shown excellent performance and fabrication tolerance, making it a potential candidate for use in polarization-division multiplexing optical transmitters.
