Article
Chemistry, Multidisciplinary
Dharmendra Pant, Sandip Aryal, Subhasish Mandal, Ranjit Pati
Summary: Researchers have revealed ferromagnetism in twisted bilayer graphene nanoflex using first-principles approach, finding that the ferromagnetic phase appears irregularly between 0 and 30 degrees, rather than only at specific “magic angles”. The origin of electronic instability is attributed to aperiodic modulation of interlayer interaction in the nanoflex, resulting in the breaking of several higher-symmetry phases to lower the energy.
Article
Chemistry, Multidisciplinary
Harshvardhan Jog, Luminita Harnagea, Dibyata Rout, Takashi Taniguchi, Kenji Watanabe, Eugene J. Mele, Ritesh Agarwal
Summary: We investigate the symmetries of 1T-TiSe2 and observe that the ground state of the CDW phase is achiral, but it can be transformed into a non-equilibrium chiral phase under high-intensity laser excitation, altering the electronic correlations in the material. The photogalvanic technique demonstrates the sensitivity to structural symmetries and provides evidence of different optically driven phases in 1T-TiSe2.
Article
Mechanics
V. Chandran Suja, A. Hadidi, A. Kannan, G. G. Fuller
Summary: The experimental study investigates the spatial and temporal dynamics of film thickness profiles over bubbles in binary liquid mixtures across a wide range of volatile species concentrations. It shows a peak in fluctuation stochasticity and breakdown in spatial symmetry of film thickness fluctuations at an intermediate species concentration of 50%.
Article
Nanoscience & Nanotechnology
Muhammad Ashar Naveed, Muhammad Afnan Ansari, Inki Kim, Trevon Badloe, Joohoon Kim, Dong Kyo Oh, Kashif Riaz, Tauseef Tauqeer, Usman Younis, Murtaza Saleem, Muhammad Sabieh Anwar, Muhammad Zubair, Muhammad Qasim Mehmood, Junsuk Rho
Summary: The team successfully designed a metasurface based on asymmetrical spin-orbit interactions that operates in the visible light domain using low-loss dielectric materials. This cost-effective design offers potential applications in asymmetric data inscription and smartphone displays, among others.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Ye Du, Wei-Qiang Liao, Yibao Li, Chao-Ran Huang, Tian Gan, Xiao-Gang Chen, Hui-Peng Lv, Xian-Jiang Song, Ren-Gen Xiong, Zhong-Xia Wang
Summary: A homochiral organic ferroelectric crystal that exhibits reversible photoinduced molecular orbital breaking and enables reversible switching of ferroelectric domains by optical manipulation was synthesized for the first time. This finding sheds light on the exploration of molecular orbital breaking in ferroelectrics for optical manipulation of ferroelectricity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Bowen Yang, Yin Min Goh, Suk Hyun Sung, Gaihua Ye, Sananda Biswas, David A. S. Kaib, Ramesh Dhakal, Shaohua Yan, Chenghe Li, Shengwei Jiang, Fangchu Chen, Hechang Lei, Rui He, Roser Valenti, Stephen M. Winter, Robert Hovden, Adam W. Tsen
Summary: The authors investigate the magnetic anisotropy in monolayer RuCl3 and observe a transition from easy-plane to easy-axis due to in-plane distortions of Cl atoms. This finding is important for realizing a quantum spin liquid. The study provides insights into the possibility of exploring Kitaev physics in a true two-dimensional limit.
Article
Optics
Xinning Yu, Yaxin Li, Bijun Xu, Xiaogang Wang, Lei Zhang, Jun Chen, Zhifang Lin, Che Ting Chan
Summary: By using the Cartesian multipole expansion theory, a general relationship between lateral optical force (LOF) and spin and momentum is established, demonstrating that the LOF exerted on an isotropic achiral particle is proportional to the optical transverse spin in the incident evanescent wave. This anomalous LOF suggests the direct detectability of the transverse spin of light and mimics the transverse shift of light in the spin Hall effect of photons, manifesting itself as a mechanical consequence of the Berry phase effect.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Y. M. P. Gomes, Rudnei O. Ramos
Summary: This study analyzes chiral symmetry breaking in a planar four-fermion model with non-null chemical potential, temperature, and the tilt of the Dirac cone. It utilizes a (2 + 1) dimensional Gross-Neveu-like interaction model in the context of the generalized Weyl Hamiltonian, studying the system's phase structure in mean-field and large-N approximations. Possible applications of the results in areas like graphene are discussed, as well as the effect of an external magnetic field on the system, which can lead to the anomalous Hall effect.
Article
Chemistry, Multidisciplinary
Wei-Qiang Liao, Yu-Ling Zeng, Yuan-Yuan Tang, Yu-Qiu Xu, Xiao-Yun Huang, Hang Yu, Hui-Peng Lv, Xiao-Gang Chen, Ren-Gen Xiong
Summary: This article proposes a new mechanism of ferroelectrics, i.e. the dual breaking of molecular orbitals and spatial symmetry in a photochromic organic crystal with light-induced polarization switching. By controlling the ultraviolet/visible light irradiation, a reversible switch between shoulder-to-shoulder form and head-to-head form is achieved. This mechanism can be used to manipulate ferroelectric polarization and has significant application prospects.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Md Gius Uddin, Susobhan Das, Abde Mayeen Shafi, Vladislav Khayrudinov, Faisal Ahmed, Henry Fernandez, Luojun Du, Harri Lipsanen, Zhipei Sun
Summary: Engineering the dipole orientation and symmetry of materials by integrating 1D nanowires with 2D layered materials is reported. This mixed-dimensional heterostructure enhances optical responses and breaks the symmetry of materials, leading to strong optical anisotropy.
Article
Chemistry, Physical
Feixue Gao, Ming Fang, Shuo Zhang, Meiyan Ni, Yawen Cai, Yifeng Zhang, Xiaoli Tan, Mingguang Kong, Wei Xu, Xiangke Wang
Summary: In this study, the centrosymmetry of Bi2S3 nanorods is broken by introducing Si defects into the crystal lattice, enabling them to efficiently reduce Cr(VI) through piezocatalysis. Moreover, the application of an alternating magnetic field (AMF) greatly enhances the piezocatalytic reduction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Mechanics
Yaobing Zhao, Panpan Zheng, Henghui Lin, Lincong Chen
Summary: This study deals with the nonlinear dynamics of suspended cables considering temperature changes and damage situations. The thermal-induced crossover shifting and damage-induced symmetry-breaking are investigated. A condensed mathematical model with thermal and damage effects is used for transverse displacements, and a weighted residual technique based on the Galerkin method is adopted for model reduction. Both polar and Cartesian forms of modulation equations are achieved, and natural frequencies and mode shapes with thermal and damage effects are presented. Resonant behaviors of suspended cables after crossover points shifting and symmetry-breaking are revealed, and quantitative and qualitative differences induced by temperature and damage factors are illustrated through parametric studies. Direct numerical integration solutions confirm the perturbation ones.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Physics, Multidisciplinary
Zhen-Ye Huang, Xin-Yi Fan, Jianwen Zhou, Hai-Jun Zhou
Summary: Predictive coding is a significant theoretical framework in neuroscience that utilizes internal models and prediction errors to perceive and understand the external world. This study focuses on the effects of lateral interactions in predictive coding, and through experiments and simulations, interesting phenomena are discovered, such as learning breaking the symmetry between neurons and high input correlation not necessarily leading to strong direct interactions.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
Article
Computer Science, Information Systems
Qianqian Lu, Jonna Tiainen, Mehran Kiani-Oshtorjani, Yangfang Wu
Summary: This paper investigates the effects of radial flow force and static pressure on the lateral force of a hydraulic sliding-spool valve. It is found that static pressure is the predominant factor in determining the lateral force, and that the radial force is lower in the inlet control mode compared to the outlet control mode. The lateral force on the spool increases with pressure, reaching a maximum of 300N, emphasizing the importance of considering this force in selecting an actuator, especially in high pressure applications.
Article
Optics
Hongda Yu, Zhe Shen, Kaiwen Jiang
Summary: This Letter reports the intrinsic relationship among surface plasmon polaritons, lateral optical force, and surface plasmon-coupled emission. The unidirectional excitation of surface plasmon polaritons through spin-orbit coupling generates asymmetric scattering and counter-intuitive lateral optical force. The influence of lateral optical force can be observed in surface plasmon-coupled emission patterns.
Article
Optics
Yusen Zhang, Ziheng Xiu, Xiangsuo Fan, Ruxue Li, Huajin Chen, Hongxia Zheng, Wanli Lu, Zhifang Lin
Summary: Based on full wave simulation and the Maxwell stress tensor theory, this study demonstrates an enhanced transverse optical gradient force acting on Rayleigh particles immersed in a simple optical field formed by two linearly polarized plane waves. The force can be enhanced by two orders of magnitude via coating an extremely thin silver shell on the conventional dielectric particle. The enhanced force mainly comes from the interaction between the incident field and the electric quadrupole excited in the core-shell particle. In addition, the optical potential energy and the optical trapping stiffness for the core-shell particle are greatly enhanced, making stable optical trapping possible.
Article
Optics
Pengbo Liu, Zhenghe Zhang, Man Lang, Wanli Lu, Ping Bai, Zefeng Chen, Shaojun Wang, Xiaofeng Li
Summary: This study presents a new technique to integrate atomic layers into silicon nanoparticle arrays, aiming to enhance the performance of photonic devices. By adjusting the parameters of the arrays, the emission from monolayer semiconductors can be controlled and manipulated.
Editorial Material
Nanoscience & Nanotechnology
Xiao Li, Jack Ng
Summary: Nano-antennas can generate optical recoil forces to independently control the direction and rotation of small objects.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Xiao-Long Lu, Jia-En Yang, Huajin Chen
Summary: Antichiral edge state (AES), a theoretical concept proposed by Colomes and Franz, has been recently realized in experiments. By increasing the intensity of circularly polarized light, anisotropic AES can be induced, and the spin-polarized AES can also be induced by antiferromagnetic exchange field and electric field. These propagating channels are robust against weak normal dephasing effect, providing diverse platforms for designing topological devices in the future.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Lv Feng, Jiangnan Ma, Wanli Lu, Huajin Chen, Hongxia Zheng
Summary: Based on the multipole expansion theory, it is shown that a transverse optical torque acting on a dipolar plasmonic spherical nanoparticle can be anomalously enhanced in two plane waves with linear polarization. Compared to a homogeneous Au nanoparticle, the transverse optical torque acting on an Au-Ag core-shell nanoparticle with an ultra-thin shell thickness can be dramatically enhanced by more than two orders of magnitude. This enhanced transverse optical torque is dominated by the interaction between the incident optical field and the electric quadrupole excited in the dipolar core-shell nanoparticle. It is noted that the torque expression based on the dipole approximation usually used for dipolar particles is not available even in our dipolar case. These findings deepen the understanding of the optical torque and may have applications in optically driven rotation of plasmonic microparticles.
Article
Chemistry, Analytical
Enyong Xu, Anqing Wu, Juliu Li, Huajin Chen, Xiangsuo Fan, Qibai Huang
Summary: This paper proposes a robust principal component decomposition model with joint spatial and temporal filtering and L1 norm regularization to effectively suppress the complex backgrounds in infrared target detection. The model achieved a better background suppression effect and higher detection rate compared to other algorithms under the same false alarm rate.
Article
Physics, Multidisciplinary
Xiao-Long Lu, Hang Xie, Jia-En Yang, Ru-Xue Li, Long Du, Hua-Jin Chen, Hui-sheng Zhang
Summary: We investigate the formation and transport properties of inner edge states in hybrid nanoribbons. New types of inner edge states, including spin-polarized, spin-valley-polarized, and valley-polarized antichiral inner edge states, are obtained. We also discover interesting transport phenomena of intravalley and intervalley scatterings, dependent on propagating direction, propagating path, spin mode, and wave-vector mismatches between inner edge states. These findings have potential applications in designing topological spin, spin-valley, and valley filters in graphene and related materials.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Fan Nan, Xiao Li, Shuailong Zhang, Jack Ng, Zijie Yan
Summary: This study reports the stable optical trapping and switchable optical rotation of nanoparticle-assembled micromotors with programmed phase of light. By imprinting customized phase gradients into a circularly polarized flat-top laser beam, the researchers were able to trap and assemble metal nanoparticles into reconfigurable clusters, allowing for direction-switchable and magnitude-tunable optical torque.
Article
Nanoscience & Nanotechnology
Xiaoshu Zhao, Haoze Lin, Huajin Chen, Hongxia Zheng, Jack Ng
Summary: Designing a monochromatic spatially-structured light field that recovers the pre-specified profile of optical force (OF) exerted on a particle is an inverse problem. Despite decades of research on OF, it is little studied due to the need for high dimensional optimization and lengthy calculations. In this work, we present the first attempt to attack this inverse design problem using the back-propagation algorithm and a machine learning framework. We provide efficient expressions of OF, which depend on polynomial and trigonometric functions, for the engineered parameters governing the structured light field. Two illustrative examples are presented, showcasing the reproduction of a predefined spatial pattern of OF and a negative longitudinal OF in a transversely trapping area.
Article
Multidisciplinary Sciences
Fan Nan, Francisco J. Rodriguez-Fortuno, Shaohui Yan, Jack J. Kingsley-Smith, Jack Ng, Baoli Yao, Zijie Yan, Xiaohao Xu
Summary: This study reports a general and controllable lateral optical force in a nonchiral elongated nanoparticle illuminated by an obliquely incident plane wave. The magnitude and direction of the force can be tuned by multiple parameters of the particle and light. Experimental evidence of switchable lateral optical force is provided. This work has significant implications in optomechanical applications.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Wanli Lu, Huajin Chen, Shiyang Liu, Zhifang Lin
Summary: An arbitrary conical angle is introduced to study the propagation properties of circular Airy beams beyond the paraxial approximation. It is found that the nonparaxiality becomes obvious for large conical angles, and the field intensity at the focal point can be enhanced by adjusting the conical angle. Moreover, the longitudinal component of the field is enhanced and the longitudinal gradient of the field intensity is enlarged for large conical angles, suggesting the possibility of stable optical trapping for microparticles.
