Article
Chemistry, Multidisciplinary
Chaolumen Wu, Qingsong Fan, Wanling Wu, Tian Liang, Yun Liu, Huakang Yu, Yadong Yin
Summary: Integrating plasmonic resonance into photonic bandgap nanostructures allows for additional control over their optical properties. One-dimensional plasmonic photonic crystals with angular dependent structural colors are fabricated by assembling magnetoplasmonic colloidal nanoparticles under a magnetic field. The assembled structures exhibit angular dependent colors based on the activation of optical diffraction and plasmonic scattering.
Article
Physics, Multidisciplinary
Kohei Shiota, Akito Inui, Yuta Hosaka, Ryoga Amano, Yoshichika Onuki, Masato Hedo, Takao Nakama, Daichi Hirobe, Jun-ichiro Ohe, Jun-ichiro Kishine, Hiroshi M. Yamamoto, Hiroaki Shishido, Yoshihiko Togawa
Summary: A spin-polarized state was studied in chiral disilicide crystals NbSi2 and TaSi2 at room temperature without magnetic fields, where long-range spin transport occurred over ten micrometers. The conversion coefficient in the current-voltage characteristics adhered to a sum rule, while a diamagnetic nature suggested itinerant electron spins rather than localized ones were responsible for the spin polarization. In addition, a robust protection of spin polarization was observed in chiral crystals over long distances.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Liangliang Gu, Rong Shu, Xiangfeng Liu, Haifeng Hu, Qiwen Zhan
Summary: In this work, a diffractive circular dichroism enhancement technique using stereoscopic plasmonic molecule structures is proposed. The dominant chiral scattering mechanism is identified as the z-component of the electric dipole during the interaction between an individual plasmonic molecule and a grazing plane wave. Through the design of periodic plasmonic molecule structures, large diffractive circular dichroism can be achieved, which is validated by numerical simulations and experimental results. The proposed approach has potential application in enhanced spectroscopy techniques for measuring chiral information, crucial for fundamental physical and chemical research as well as bio-sensing applications.
Article
Nanoscience & Nanotechnology
Jefferson Dixon, Feng Pan, Parivash Moradifar, Priyanuj Bordoloi, Sahil Dagli, Jennifer Dionne
Summary: When light interacts with matter, it produces color through scattering and absorption. The symmetry of matter can be examined through the polarization of light, especially circularly-polarized light. Recent advances in controlling circularly-polarized light have shown that judicious control of longitudinal symmetry is a key factor. This can be applied in various fields such as optical communication, quantum emitters control, and detection of small molecule asymmetry.
Article
Computer Science, Artificial Intelligence
Marcella Astrid, Muhammad Zaigham Zaheer, Seung-Ik Lee
Summary: Due to the rarity of anomalous events, video anomaly detection is typically approached as a one-class classification problem. Previous studies have shown that autoencoders trained with only normal data can still reconstruct anomalous data, resulting in decreased performance. To address this, we propose incorporating pseudo anomalies during the training of autoencoders to limit their anomaly reconstruction capability. Extensive experiments using different types of pseudo anomalies demonstrate the robustness of our training mechanism. Additionally, our proposed approach outperforms existing state-of-the-art methods on three benchmark video anomaly datasets, showing the second best performance in one dataset and the best performance in two datasets.
Article
Physics, Applied
Yanan Dai, Zhikang Zhou, Atreyie Ghosh, Karan Kapoor, Maciej Dabrowski, Atsushi Kubo, Chen-Bin Huang, Hrvoje Petek
Summary: We report a study on transient plasmonic spin skyrmion topological quasiparticle using ultrafast interferometric time-resolved photoemission electron microscopy. By modeling and experimental measurements, we obtain the spin texture, boundary, and topological charges of the skyrmion, and discover its ability to drive magnetoelectric responses.
APPLIED PHYSICS REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
Lei Jin, Ying Liu, Wei-Wang Yu, Xiaoming Zhang, Guodong Liu, Xuefang Dai
Summary: The fundamental symmetry in condensed matter physics, crystallographic symmetry, has been studied extensively. The search for unconventional excitations beyond Dirac and Weyl fermions has focused on nonmagnetic materials, while magnetic sextuple excitations have received less attention. In this study, a systematic search is performed for ferromagnetic sextuple points without spin-orbit coupling. The stability of the sextuple excitation is found to depend on the little point group Td. Through first-principles calculations, 67 ferromagnetic material candidates are identified, providing a platform for investigating spin-polarized sextuple excitations and spintronics.
Article
Nanoscience & Nanotechnology
Natalia Kowalska, Filip Bandalewicz, Jakub Kowalski, Sergio Gomez-Grana, Maciej Bagiriski, Isabel Pastoriza-Santos, Marek Grzelczak, Joanna Matraszek, Jorge Perez-Juste, Wiktor Lewandowski
Summary: This study proposes an efficient method to synthesize hydrophobic nanoparticles with intrinsic chirality using liquid crystal-like ligands, and confirms the chiral geometry of these nanoparticles. The method has the potential to produce chiral plasmonic inorganic/organic nanocomposites with specific structures, expanding their applications in soft-matter based systems.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Lin-Ding Yuan, Xiuwen Zhang, Carlos Mera Acosta, Alex Zunger
Summary: This article discusses the hidden spin polarization effect in collinear antiferromagnets without spin-orbit coupling and validates these symmetry enabling predictions with first-principles density functional calculations. This will boost the theoretical and experimental efforts in finding new spin-polarized materials.
NATURE COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Hammam Al-Bustami, Shylee Belsey, Tzuriel Metzger, Daniel Voignac, Shira Yochelis, Oded Shoseyov, Yossi Paltiel
Summary: This study demonstrates that electron spin is a fundamental driving force for the organization of cellulose nanocrystals (CNCs) and can be utilized to modulate the fabrication process. The researchers utilize the chiral-induced spin selectivity (CISS) effect in sugars to control the CNC organization and show that different magnetization directions can influence the CNC arrangement. The introduction of a cross-linker enhances the packing density and the chiral state of the CNC helical structure.
Article
Chemistry, Multidisciplinary
Zhiyu Tan, Fei Fan, Shengnan Guan, Hao Wang, Dan Zhao, Yunyun Ji, Shengjiang Chang
Summary: This work introduces the gyrotropic semiconductor InSb into a twisted bilayer metasurface to form a magneto-optical moire metasurface. Through theoretical analysis, it is found that a specific moire angle can simultaneously break time-reversal symmetry and spatial mirror symmetry, resulting in nonreciprocity and chirality with spin-conjugate asymmetric transmission. The experiments confirm the active manipulation of chirality through the rotation of the twisted angle and external magnetic field, achieving spin-conjugate asymmetric transmission.
Article
Materials Science, Multidisciplinary
Aimo Winkelmann, Grzegorz Cios, Tomasz Tokarski, Piotr Bala, Yuri Grin, Ulrich Burkhardt
Summary: This paper investigates the effects of crystal structures of manganese, tellurium, and selenium elements on chirality, and resolves the presence of two physically different variants in crystallographic analyses. The study demonstrates the sensitivity of dynamical Kikuchi diffraction in scanning electron microscope to the local sense of chirality in crystals of single chemical elements.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Satoru Hayami
Summary: This study theoretically investigates the nature of an electric ferroaxial moment under magnetic orderings. The results show that a vortex spin texture leads to the emergence of the ferroaxial moment, depending on the helicity. Moreover, the study reveals that the atomic spin-orbit coupling and hybridization between orbitals with different parity are key factors in inducing the ferroaxial moment.
Article
Physics, Condensed Matter
Vladimir A. Gavrichkov, Semyon I. Polukeev
Summary: This article focuses on the structural features of 2D perovskite cuprates and investigates the sources of charge and spin inhomogeneity. The impurity Anderson model was used to demonstrate the presence of charge inhomogeneity at low doping concentrations, which disappears when the doping level exceeds a certain threshold.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Materials Science, Multidisciplinary
Satoru Hayami, Megumi Yatsushiro
Summary: We propose a theoretical method to achieve nonlinear nonreciprocal transport in antiferromagnets without relying on spin-orbit coupling. Through symmetry and microscopic model analyses, we demonstrate two different mechanisms for nonlinear transport and provide example validations.
Article
Physics, Applied
Kun Song, Changlin Ding, Zhaoxian Su, Yahong Liu, Chunrong Luo, Xiaopeng Zhao, Khagendra Bhattarai, Jiangfeng Zhou
JOURNAL OF APPLIED PHYSICS
(2016)
Article
Engineering, Electrical & Electronic
Khagendra Bhattarai, Sinhara R. Silva, Augustine Urbas, Sang Jun Lee, Zahyun Ku, Jiangfeng Zhou
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2017)
Article
Multidisciplinary Sciences
Khagendra Bhattarai, Sinhara Silva, Kun Song, Augustine Urbas, Sang Jun Lee, Zahyun Ku, Jiangfeng Zhou
SCIENTIFIC REPORTS
(2017)
Article
Materials Science, Multidisciplinary
Shuai Lin, Sinhara Silva, Jiangfeng Zhou, Diyar Talbayev
ADVANCED OPTICAL MATERIALS
(2018)
Article
Materials Science, Multidisciplinary
Kun Song, Zhaoxian Su, Sinhara Silva, Clayton Fowler, Changlin Ding, Ruonan Ji, Yahong Liu, Xiaopeng Zhao, Jiangfeng Zhou
OPTICAL MATERIALS EXPRESS
(2018)
Article
Multidisciplinary Sciences
Kun Song, Zhaoxian Su, Min Wang, Sinhara Silva, Khagendra Bhattarai, Changlin Ding, Yahong Liu, Chunrong Luo, Xiaopeng Zhao, Jiangfeng Zhou
SCIENTIFIC REPORTS
(2017)
Article
Multidisciplinary Sciences
Shuai Lin, Khagendra Bhattarai, Jiangfeng Zhou, Diyar Talbayev
SCIENTIFIC REPORTS
(2017)
Article
Multidisciplinary Sciences
Jehwan Hwang, Boram Oh, Yeongho Kim, Sinhara Silva, Jun Oh Kim, David A. Czaplewski, Jong Eun Ryu, Eun Kyu Kim, Augustine Urbas, Jiangfeng Zhou, Zahyun Ku, Sang Jun Lee
SCIENTIFIC REPORTS
(2018)
Article
Chemistry, Physical
Kun Song, Ruonan Ji, Duman Shrestha, Changlin Ding, Yahong Liu, Weiren Zhu, Wentao He, Huidong Liu, Yuhua Guo, Yongkang Tang, Xiaopeng Zhao, Jiangfeng Zhou
Article
Materials Science, Multidisciplinary
Jiyeon Jeon, Jehwan Hwang, Khagendra Bhattarai, Deok-Kee Kim, Jun Oh Kim, Augustine Urbas, Jiangfeng Zhou, Zahyun Ku, Sang Jun Lee
OPTICAL MATERIALS EXPRESS
(2019)
Article
Optics
Elise Keshock, Peisong Peng, Jiangfeng Zhou, Diyar Talbayev
Article
Materials Science, Multidisciplinary
Clayton Fowler, Sinhara Silva, Grija Thapa, Jiangfeng Zhou
Summary: We demonstrated a high-efficiency RF energy harvesting device based on a metamaterial perfect absorber (MPA). The device converts captured RF waves to DC power using embedded Schottky diodes. The use of Fabry-Perot cavity resonance greatly enhances the amount of captured energy.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Peisong Peng, Grija Thapa, Jiangfeng Zhou, Diyar Talbayev
Summary: We report the observation of magneto-optical nonreciprocity in Faraday geometry in a hybrid metamaterial consisting of an Archimedean spiral metasurface and semiconductor InSb that serves as the magneto-optical medium. Our metamaterial can serve as an optical element for polarization control via magnetic field, and four different transmittance states are observed.
Article
Optics
Peisong Peng, Grija Thapa, Jiangfeng Zhou, Diyar Talbayev
Summary: Materials with broken spatial and time reversal symmetries can create emergent phenomena in the interaction between light and matter. By combining the chirality and broken time reversal symmetry in a magnetic field, a terahertz hybrid metamaterial has been constructed, which exhibits a resonant magneto-chiral effect leading to polarization-independent nonreciprocal optical transmittance. Additionally, a magneto-optical Faraday effect controlled by the natural optical activity of the chiral gammadion bilayer has been discovered, offering potential applications in polarization-independent optical isolation and highly efficient polarization control.
Article
Multidisciplinary Sciences
Clayton Fowler, Jun Oh Kim, Sang Jun Lee, Augustine Urbas, Zahyun Ku, Jiangfeng Zhou
ADVANCED THEORY AND SIMULATIONS
(2019)
