Article
Optics
Xiaoxiao Wang, Ruizhe Gu, Yandong Li, Huixin Qi, Xiaoyong Hu, Qihuang Gong
Summary: This study proposes a method to construct effective Hamiltonians for higher-order topological insulators, enabling the generation of topological hinge states at gain-loss domain walls, and demonstrates the potential for dynamic control of these states.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Xiaomeng Zhang, Yuyu Zhou, Xiaochen Sun, Xiujuan Zhang, Ming-Hui Lu, Yan-Feng Chen
Summary: This study reports reconfigurable light imaging based on a two-dimensional photonic higher-order topological insulator (HOTI). By adjusting material and structural parameters, different topological states can be achieved, enabling various types of light imaging. This reconfigurable light imaging has high potential for future intelligent devices.
Article
Chemistry, Multidisciplinary
Anton Vakulenko, Svetlana Kiriushechkina, Mingsong Wang, Mengyao Li, Dmitry Zhirihin, Xiang Ni, Sriram Guddala, Dmitry Korobkin, Andrea Alu, Alexander B. Khanikaev
Summary: This study introduces a new mechanism for establishing all-dielectric infrared HOTI metasurfaces, showing two types of HOTI states and observing the topological transition and emergence of HOTI states through experiments. The proposed all-dielectric HOTI metasurface offers a new approach to confine the optical field in micro- and nano-scale topological cavities.
ADVANCED MATERIALS
(2021)
Review
Optics
Guo-Jing Tang, Xin-Tao He, Fu-Long Shi, Jian-Wei Liu, Xiao-Dong Chen, Jian-Wen Dong
Summary: Recent research in topological photonics has made significant progress in proposing and realizing novel topological phenomena, designing and fabricating high-performance photonic devices. Photonic crystals, as a powerful platform for controlling the flow of light, have been widely used to reveal different topological phases of light and demonstrate topological photonic functionalities. Furthermore, topological photonic crystals have found applications in both passive and active photonics.
LASER & PHOTONICS REVIEWS
(2022)
Article
Physics, Applied
Jiale Qian, Qing Wang, Zebin Zhu, Jing Yuan, Liyong Jiang
Summary: In this paper, reconfigurable Wannier-type higher-order PTIs based on a photonic crystal are reported. The refractive index of BaTiO3 can be adjusted to achieve active switching between different topological edge and corner states at the interface.
APPLIED PHYSICS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Xun-Jiang Luo, Xiao-Hong Pan, Xin Liu
Summary: The study demonstrates that the interplay between superconductors and magnetic fields based on the surface states of a weak topological insulator can lead to various helical or chiral Majorana hinge modes and even corner modes. The obtained higher-order topological superconductors can naturally behave as a TSC in DIII or D symmetry class due to their certain boundaries, surfaces, or hinges. These higher-order TSCs can be characterized by boundary topological invariants, such as surface Chern numbers or surface Z(2) topological invariants for surface TSCs.
Article
Optics
Yuexin Zhang, Xiaoyu Dai, Yuanjiang Xiang
Summary: This paper proposes a photonic higher-order topological insulator with a simple multilayer structure. By inserting a metallic pillar, the three-dimensional bandgap is extended, allowing for distinguishable topological modes. The lattice is reconfigurable, and introducing geometrical defects supports vertical disclination states.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Yan-Bin Yang, Kai Li, L-M Duan, Yong Xu
Summary: Disorder effects in a two-dimensional system with chiral symmetry can induce a quadrupole topological insulating phase, with topological properties defined by effective boundary Hamiltonians, the quadrupole moment, and zero-energy corner modes. The study also reveals gapped and gapless topological phases, as well as a Griffiths regime, where states at zero energy become multifractal. The self-consistent Born approximation is applied to show that the induced topological phase arises from disorder-renormalized masses.
Review
Nanoscience & Nanotechnology
Yafeng Chen, Zhihao Lan, Zhongqing Su, Jie Zhu
Summary: This article discusses the recent advances and achievements in the development of photonic and phononic topological insulators using inverse design methodologies. It covers one-dimensional TIs, TIs based on the quantum spin Hall effect and quantum valley Hall effect, as well as high-order TIs in lattices with diverse symmetries. Several inversely designed photonic and phononic TIs with superior performance are showcased, and the future of this emerging research field is also discussed.
Article
Optics
Juan Kang, Tao Liu, Mou Yan, Dandan Yang, Xiongjian Huang, Ruishan Wei, Jianrong Qiu, Guoping Dong, Zhongmin Yang, Franco Nori
Summary: Recently, higher-order topological insulators (HOTIs) with topologically nontrivial boundary states have been extensively studied. A novel type of HOTIs called square-root HOTIs, where the topological nature comes from the square of the Hamiltonian, has been experimentally demonstrated in 2D photonic waveguide arrays written in glass using femtosecond laser direct-write techniques. The presence of edge and corner states at visible light spectra has been confirmed experimentally, and the dynamical evolutions of topological boundary states have been observed, suggesting potential applications in information processing and lasing.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Yafeng Chen, Zhihao Lan, Jie Zhu, Zhongqing Su
Summary: Photonic topological insulators offer efficient and robust manipulation of light. This study focuses on anisotropic topological edge states in two-dimensional photonic systems, considering both transverse magnetic (TM) and transverse electric (TE) modes. By using topology optimization, maximized odd-order band gaps are achieved in photonic crystals (PCs). An anisotropic topological phase transition is then induced, resulting in tightly localized anisotropic topological edge states at the interface of primitive and translated unit cells. Numerical simulations confirm the transmission properties of these anisotropic topological edge states. Our findings have implications for the development of reliable topological photonic devices.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Shiyin Jia, Renwen Huang, Junzheng Hu, Yao Jiang, Hui Huang, Biye Xie, Minghui Lu, Peng Zhan, Yanfeng Chen, Zhenlin Wang
Summary: A facile approach to achieve flexible control of light-steering based on symmetrized wave profiles of topological corner states is introduced, which allows for controllable excitation and coding technique via controllable excitation of topological corner states. Additionally, an effective way to achieve direction-selective excitation of topological edge states without circularly polarized sources is proposed. This offers a reliable technique to modulate higher-order topological boundary states while maintaining the photonic structure, providing a practical alternative for flexible manipulation of light in integrated topological photonic devices with fixed configuration.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Tanay Nag, Vladimir Juricic, Bitan Roy
Summary: In this study, a hierarchy of higher-order Floquet topological phases in three dimensions is constructed by periodically driving static first-order topological phases with suitable discrete symmetry breaking Wilson-Dirac masses. Realizations of second-order and third-order Floquet topological states, supporting dynamic hinge and corner modes, respectively, are demonstrated by introducing one and two discrete symmetry breaking Wilson-Dirac mass(es). The resulting dynamic hinge and corner modes, protected by antiunitary spectral or particle-hole symmetries, live on boundaries with different codimensions.
Article
Physics, Condensed Matter
Jose A. Medina-Vazquez, Evelyn Y. Gonzalez-Ramirez, Jose G. Murillo-Ramirez
Summary: Recent studies have shown that higher-order topologies in photonic systems enhance light-matter interactions. This work proposes a method to generate two different higher-order topological phases with corner states that allow a double resonant effect. By designing a photonic structure to generate a higher-order topological insulator phase and a higher-order Dirac half-metal phase, double resonance effect with high efficiency is achieved. This has potential applications in producing second-harmonic generation and studying nonlinear Dirac-light-matter interactions.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Qiang Wei, Xuewei Zhang, Weiyin Deng, Jiuyang Lu, Xueqin Huang, Mou Yan, Gang Chen, Zhengyou Liu, Suotang Jia
Summary: The concept of higher-order topological materials goes beyond first-order topological states, featuring 1D hinge states and 0D corner states. A second-order topological Weyl semimetal has been experimentally demonstrated in a 3D-printed acoustic crystal, showcasing Weyl points, Fermi arc surface states, and hinge states.
Article
Rheumatology
Xiaoxiao Cheng, Meichen Zhou, Jianhua Jiang, Sijia Zhu, Qi Fang, Meirong Liu
Summary: This study aimed to explore the difference in thigh MRI findings between DM patients with and without cancer. It found that honeycomb pattern edema signals in quadriceps but not adductors were more frequently found in cancer-associated DM patients.
CLINICAL RHEUMATOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jiayu Yin, Wenli Liao, Yuyan Zhang, Jianhua Jiang, Chengying Chen
Summary: In this paper, an improved 8T2R nonvolatile SRAM (nvSRAM) memory cell was proposed, which combines the advantages of low-power consumption of static random access memory (SRAM) with high stability and nonvolatile of resistive memory (RRAM). RRAM technology was introduced into SRAM to solve the problem of data storage when SRAM is powered off. Differential mode and pre-decoding technology were adopted to improve the data restoration speed and address decoding speed, while a voltage-mode sensitive amplifier was used to achieve fast amplification of two bit lines, thereby improving the reading speed of the memory. An 8kb nvSRAM was implemented with a CMOS 28 nm 1P9M process. Simulation results showed that the memory achieved good performance.
APPLIED SCIENCES-BASEL
(2023)
Review
Optics
Jian Wei You, Zhihao Lan, Qian Ma, Zhen Gao, Yihao Yang, Fei Gao, Meng Xiao, Tie Jun Cui
Summary: Metasurfaces are thin films with subwavelength structures that can control the polarization, phase, and amplitude of light. Recent developments in topological photonics have greatly expanded the design possibilities for metasurfaces in novel applications. This review summarizes recent progress in the field of topological metasurfaces, covering both passive and active systems in the classical and quantum regimes. It discusses passive topological phenomena and cutting-edge studies of active topological metasurfaces, as well as their potential applications in quantum information and many-body physics.
PHOTONICS RESEARCH
(2023)
Article
Physics, Multidisciplinary
Peng Tian, Wenxuan Ge, Songsong Li, Lei Gao, Jianhua Jiang, Yadong Xu
Summary: Research on near-field radiative heat transfer (NFRHT) is an important project in nanotechnology following a major breakthrough. By studying the effects of multilayer structures, we discovered that changing the filling ratio can lead to the decoupling of hyperbolic modes (HMs) and the suppression of heat flow. We also found that introducing disorder in the layer thickness can affect heat transfer, although the reduction in heat transfer is not significant even with large disorder. This work provides valuable insights for understanding the impact of disorder on NFRHT and guiding the fabrication of NFRHT devices.
CHINESE PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Jincheng Lu, Rongqian Wang, Chen Wang, Jian-Hua Jiang
Summary: Thermoelectric rectification and amplification were investigated in an interacting quantum-dot circuit-quantum-electrodynamics system. The elastic and inelastic transport through a cavity-coupled quantum dot under voltage biases was studied using the Keldysh nonequilibrium Green's function approach. Significant charge and Peltier rectification effects were found for strong light-matter interactions, and the dependence on electron-electron interaction could be nonmonotonic and dramatic. Electron-electron interaction-enhanced transport was observed under certain resonance conditions in both linear and nonlinear transport regimes, leading to charge and thermal currents, rectification effects, and the linear thermal transistor effect.
Article
Physics, Applied
Jiaqi Quan, Lei Gao, Jian-Hua Jiang, Yadong Xu
Summary: Passive parity-time (PT) symmetric metamaterials have attracted significant interest as a fundamental carrier to investigate non-Hermitian systems. However, previous studies have rarely focused on the diffraction properties of the PT system, especially the diffraction effect in metasurfaces with phase gradient modulation. In this study, we design and study a non-Hermitian acoustic gradient metasurface by merging the concepts of phase gradient and PT symmetry. Our work shows that the PT symmetry breaks the spatial symmetry of reflected wave diffraction in the acoustic metasurface, making it an asymmetric mirror. We also demonstrate the occurrence of high-efficiency retroreflection governed by generalized Snell's law in the metasurface at the PT-ensured exceptional point.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Cong Wang, Qingjia Zhou, Jian-Hua Jiang, Lei Gao, Yadong Xu
Summary: In this study, we introduce the concept of optical parity-time symmetry to investigate the transport of electromagnetic waves in zero-index metamaterials. We found that balanced gain and loss can induce a perfect transmission resonance in a perfect reflection background, and the resonant linewidth is controllable by the gain/loss. The introduced PT symmetry breaks the spatial symmetry of the structure, leading to the excitation of quasi-bound states in the continuum.
Article
Physics, Multidisciplinary
Shi-Qiao Wu, Yadong Xu, Jian-Hua Jiang
Summary: The development of non-Hermitian topology has led to advancements in the understanding of skin effect in non-Hermitian systems, where bulk states transition from extended to localized towards boundaries. Previous works have often required intricate parameter designs to explore skin effects. In this study, we propose a simple approach to realize tunable non-Hermitian skin effects in one and two-dimensional Su-Schrieffer-Heeger (SSH)-like tight-binding models. These skin modes can be predicted irrespective of the topological nature of the non-Hermitian systems and are dependent on the scaling factors of non-reciprocal hopping terms. The engineering of hopping configurations allows for the prediction of skin modes at desired edges or corners, exhibiting hierarchical skin effects. These tunable non-Hermitian skin effects can guide waves into specific regions and have potential applications in metamaterials.
FRONTIERS IN PHYSICS
(2023)
Review
Physics, Applied
Zeren Zhang, Liujun Xu, Teng Qu, Min Lei, Zhi-Kang Lin, Xiaoping Ouyang, Jian-Hua Jiang, Jiping Huang
Summary: This review introduces the principles, materials advances, and applications of metamaterials that modulate the diffusion of heat, particles, and plasmas. It discusses the use of the transformation principle and metamaterials to control diffusion, going beyond the conventional scope of metamaterials. Future directions include research into topological diffusion and machine-learning-assisted materials design.
NATURE REVIEWS PHYSICS
(2023)
Article
Meteorology & Atmospheric Sciences
Meng Du, Shengzhi Huang, Guoyong Leng, Qiang Huang, Yi Guo, Jianhua Jiang
Summary: Precipitation is a crucial climatic factor that affects the natural environment and hydrological processes. The excessive concentration of precipitation at different time scales in spatial and temporal distribution could increase the possibility of floods or droughts and their disaster-causing extent. However, the dynamics of precipitation concentration and its specific effects on dry and wet conditions remain unknown.
ATMOSPHERIC RESEARCH
(2023)
Review
Physics, Applied
Zhi-Kang Lin, Qiang Wang, Yang Liu, Haoran Xue, Baile Zhang, Yidong Chong, Jian-Hua Jiang
Summary: There are two prominent applications of topology in the physics of materials: band topology and topological defects. Recent experimental advancements have begun to probe their interactions. Topological lattice defects in materials offer a platform to explore a diverse range of phenomena, such as robust topological-bound states, fractional charges, topological Wannier cycles, chiral and gravitational anomalies, topological lasers, and non-Hermitian skin effects.
NATURE REVIEWS PHYSICS
(2023)
Article
Multidisciplinary Sciences
Xiang Xi, Bei Yan, Linyun Yang, Yan Meng, Zhen-Xiao Zhu, Jing-Ming Chen, Ziyao Wang, Peiheng Zhou, Perry Ping Shum, Yihao Yang, Hongsheng Chen, Subhaskar Mandal, Gui-Geng Liu, Baile Zhang, Zhen Gao
Summary: The authors report the first experimental observation of topological antichiral surface states in a magnetic Weyl photonic crystal by constructing a modified Haldane model. Antichiral surface states, the two-dimensional extension of one-dimensional antichiral edge states, have never been realized in any physical system before. The unique properties of antichiral surface states, including antichiral robust propagation and a single open Fermi arc connecting two projected Weyl points, have been directly observed in this study.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jincheng Lu, Zi Wang, Rongqian Wang, Jiebin Peng, Chen Wang, Jian-Hua Jiang
Summary: Including the phonon-assisted inelastic process can enhance the performance of thermoelectric devices. In this work, we demonstrate that inelastic phonon-thermoelectric devices have a fertile functionality diagram and can perform multiple tasks simultaneously. By studying the efficiencies and coefficients of performance of multitask quantum thermal machines, we emphasize the roles of the inelastic scattering process and multiple biases. Our work provides insights into optimizing phonon-thermoelectric devices.
Article
Materials Science, Multidisciplinary
Li -Wei Wang, Zhi-Kang Lin, Jian-Hua Jiang
Summary: This paper investigates Chern insulator phases emerging from non-Hermitian kagome models with nonreciprocal and pure imaginary next-nearest-neighbor hoppings. Hybrid topological-skin effects are explored through the identification of distinct corner skin modes in different energy regions within two band gaps, revealing the underlying physics associated with the chiral edge states. The simplicity of these kagome models and their rich emergent topological phenomena suggest that they are attractive candidates for studying non-Hermitian topological phases. The possible realizations of these models in non-Hermitian metamaterials are also discussed.
Article
Astronomy & Astrophysics
Jian-Hua Jiang
Summary: This study proposes an approach to apply the polarization degree of freedom in a 2D photonic crystal, which has potential practical applications in photonic devices.
SCIENTIA SINICA-PHYSICA MECHANICA & ASTRONOMICA
(2023)
