Article
Physics, Applied
Xiao-Lei Tang, Tian-Xue Ma, Yue-Sheng Wang
Summary: In this work, the topological rainbow trapping and energy amplification of acoustic waves in a gradient phononic crystal structure is investigated numerically and experimentally. Topological interface states (TISs) are generated along the interface between two phononic crystals with different topological phases due to the acoustic valley Hall effect. Rainbow trapping is achieved by introducing gradient into a 3D-printed phononic crystal structure by varying the geometrical parameter of scatterers along the interface. Incident acoustic waves at different frequencies split, stop, and are significantly amplified at different positions. Importantly, the rainbow trapping of TISs is immune to random structural disorders. The topological rainbow trapping shows promise for the design of broadband energy harvesters with excellent robustness.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Mechanical
Guanliang Yu, Weihao Wang, Liyan Lai, Tongrui Peng, Chun Jiang, Yigui Li
Summary: Tunable topological insulators with active tunability of frequency or path have attracted significant interest recently. This study focuses on tunable spatial paths in addition to frequency domain research. The researchers have developed a topological protection system using a thermally tunable elastic film composed of VO2 on a patterned substrate. By breaking the symmetry of the unit cell on the substrate and pre-defining topological protection paths, they achieve conduction or blocking of elastic waves using VO2's metal-insulator phase transition, enabling reconfigurable propagation paths and interfaces. Numerical simulations demonstrate the reconfigurable topological path and thermal modulation potential.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Physics, Multidisciplinary
Yating Yang, Jiuyang Lu, Mou Yan, Xueqin Huang, Weiyin Deng, Zhengyou Liu
Summary: The study introduces a new type of topological insulator in a bilayer phononic crystal, which combines first-order and second-order topological features, with one-dimensional edge states and zero-dimensional corner states existing simultaneously in the same system.
PHYSICAL REVIEW LETTERS
(2021)
Article
Acoustics
Lingyun Yao, Denghao Zhang, Ke Xu, Liqiang Dong, Xingzheng Chen
Summary: This paper investigates the topological properties of subwavelength bands in elastic phononic crystal (PC) plate hybridized with extra local resonances, and analyzes the band-structure evolution of a topological PC plate with local resonator using finite element method (FEM). The structure is capable of producing two bandgaps in the subwavelength region, and experimental tests validate the theoretical and numerical approach to the design of topological waveguides.
Article
Physics, Applied
Jianghua Li, Minquan Kuang, Jingbo Bai, Guangqian Ding, Hongkuan Yuan, Chengwu Xie, Wenhong Wang, Xiaotian Wang
Summary: In this Letter, we propose that the NiZrCl6 monolayer is a 2D ferromagnetic material with rich second-order topological phases (SOTPs). The SOTP nature in the NiZrCl6 monolayer is resistant to the spin-orbit coupling effect. This finding is important for exploring higher-order topological phases in 2D magnetic and phononic systems.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoying Zhuang, Chuong Nguyen, S. S. Nanthakumar, Ludovic Chamoin, Yabin Jin, Timon Rabczuk
Summary: This paper presents a methodology for inverse design of reconfigurable topological insulators in plate-like structures. By utilizing topology optimization and piezoelectric patches, the space inversion symmetry is broken, leading to the real-time reconfigurability of topological interfaces for waveguide applications.
MATERIALS & DESIGN
(2022)
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
Engineering, Mechanical
Zhihui Wen, Yabin Jin, Penglin Gao, Xiaoying Zhuang, Timon Rabczuk, Bahram Djafari-Rouhani
Summary: The study proposes using phononic thin plate systems for robust energy harvesting application relying on zero-dimensional cavities confined by the Kekule's distorted topological vortices. The harvesting power induced by topological cavities is about 30 times that of the bare plate. Further studies show that the proposed energy harvesting system is highly robust against symmetry-preserving defects and is less influenced even for symmetry-breaking defects at moderate perturbation level.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Jinfeng Zhao, Qi Wang, Xubo Wang, Weitao Yuan, Yao Huang, Shuhan Chen, Antoine Riaud, Jia Zhou
Summary: Researchers constructed on-chip valley phononic crystal plates by building triangular silicon pillars on a silicon plate, and introduced graded interface sliding by modulating the horizontal lattice constant in a selected region. They presented the frequency range evolution of topological edge states using simulation and laser ultrasonic technique, and observed the displacement distribution of these states in the graded interfaces as well as abnormal refraction patterns.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Physics, Multidisciplinary
Yafei Ren, Cong Xiao, Daniyar Saparov, Qian Niu
Summary: The study investigates the adiabatic evolution of electronic states induced by the lattice vibration of a chiral phonon, obtaining electronic orbital magnetization in the form of a topological second Chern form. The traditional theory needs refinement by introducing a k-resolved Born effective charge and accounting for the phonon-modified electronic energy and momentum-space Berry curvature contribution. The second Chern form may diverge when a Yang's monopole is near the parameter space of interest, as demonstrated in a gapped graphene model at the Brillouin zone corner.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Mechanical
Zhenyu Chen, Weijian Zhou
Summary: This paper investigates thermally tunable elastic wave transport with controllable topological properties in a thin plate. By using ferroelectric ceramics and temperature variation, topologically protected elastic waveguide devices can be designed to manipulate band properties and working frequencies. The results show that the topological phononic crystal plate with A-shaped prisms realizes broadband interface modes with high quality factors.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Yafeng Chen, Jie Zhu, Zhongqing Su
Summary: This study designs four new types of second-order phononic topological insulators (SPTIs) with customized dual-bandgap, allowing for dual-band corner states and potential applications in multiband communications and manipulation of elastic waves with enhanced robustness.
JOURNAL OF SOUND AND VIBRATION
(2023)
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
Engineering, Mechanical
Seongmin Park, Wonju Jeon
Summary: We propose deep-subwavelength phononic beams that support topological interface states (TISs) at ultra-low frequencies. The beams are designed using unit cells with acoustic black hole (ABH) configurations to obtain the first band gap at low frequencies, where the unit cell size is much smaller than the wavelength of the wave. By modifying the ABH configuration and breaking the inversion symmetry of the unit cell, we control the topological phases of the phononic beams and connect two topologically distinct beams to produce the TIS in their low band gaps.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Baizhan Xia, Zihan Jiang, Liang Tong, Shengjie Zheng, Xianfeng Man
Summary: This paper investigates the role of disclinations in elastic phononic plates with topological nontrivial structures. It is found that the lattice deformation caused by disclinations creates a pentagonal core with local five-fold symmetry, which can produce localized topological bound states. These topological bound states exhibit good immunity to the size and imperfections of the plates.
ACTA MECHANICA SINICA
(2022)
Article
Chemistry, Multidisciplinary
Thinh T. Le, Eli J. Curry, Tra Vinikoor, Ritopa Das, Yang Liu, Donal Sheets, Khanh T. M. Tran, Christopher J. Hawxhurst, James F. Stevens, Jason N. Hancock, Osama R. Bilal, Leslie M. Shor, Thanh D. Nguyen
Summary: A reusable, highly effective, and humidity-resistant air filtration membrane has been developed using piezoelectric electrospun poly (l-lactic acid) nanofibers. The membrane achieves high particle removal efficiency with low breathing resistance. It also demonstrates good humidity resistance and stable filtration performance. In addition, a biodegradable nanofiber-based facemask prototype decomposes within 5 weeks in an accelerated degradation environment.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Semih Taniker, Vincenzo Costanza, Paolo Celli, Chiara Daraio
Summary: We propose the realization of capacitive temperature sensors based on the concept of displacement amplification. Our design utilizes high CTE metallic layers and a low CTE dielectric layer to achieve large out-of-plane displacements and capacitive changes as the temperature increases.
IEEE SENSORS JOURNAL
(2022)
Article
Acoustics
A. Palermo, B. Yousefzadeh, C. Daraio, A. Marzani
Summary: This study investigates the propagation of Rayleigh waves in a half-space coupled to a nonlinear metasurface, analyzing the effects of nonlinear interaction force and energy loss on wave dispersion. The research presents closed-form expressions to predict the dispersive characteristics of nonlinear Rayleigh waves, demonstrating how different types of nonlinearity affect spectral gaps in the metasurface and revealing spatial gaps induced by softening nonlinearity in dispersion curves.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Materials Science, Multidisciplinary
Connor McMahan, Andrew Akerson, Paolo Celli, Basile Audoly, Chiara Daraio
Summary: In this work, an effective continuum model is constructed to describe architected sheets composed of bulky tiles connected by slender elastic joints. The model successfully captures the low-energy local kinematic modes favored by the sheets' mesostructure and reproduces the out-of-plane buckling observed in non-uniform specimens. This modeling approach has potential applications to other shape-morphing systems of interest to the mechanics community.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Multidisciplinary Sciences
Liwei Wang, Jagannadh Boddapati, Ke Liu, Ping Zhu, Chiara Daraio, Wei Chen
Summary: This study presents a systematic, data-driven design approach to create mechanical cloaks using a large precomputed unit cell database. The method allows for the design of cloaks with different boundary conditions, loadings, shapes, and numbers of voids, resulting in better cloaking performance and versatility compared to conventional fixed-shape solutions. Experimental measurements on additively manufactured structures confirm the validity of the proposed approach. The research demonstrates the benefits of data-driven approaches in quickly responding to new design scenarios and resolving computational challenges associated with multiscale designs of functional structures.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Review
Nanoscience & Nanotechnology
Anastasiia O. Krushynska, Daniel Torrent, Alejandro M. Aragon, Raffaele Ardito, Osama R. Bilal, Bernard Bonello, Federico Bosia, Yi Chen, Johan Christensen, Andrea Colombi, Steven A. Cummer, Bahram Djafari-Rouhani, Fernando Fraternali, Pavel I. Galich, Pedro David Garcia, Jean-Philippe Groby, Sebastien Guenneau, Michael R. Haberman, Mahmoud I. Hussein, Shahram Janbaz, Noe Jimenez, Abdelkrim Khelif, Vincent Laude, Mohammad J. Mirzaali, Pawel Packo, Antonio Palermo, Yan Pennec, Ruben Pico, Maria Rosendo Lopez, Stephan Rudykh, Marc Serra-Garcia, Clivia M. Sotomayor Torres, Timothy A. Starkey, Vincent Tournat, Oliver B. Wright
Summary: This review article provides a summary of recent advances and hot research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on the authors' presentations at the EUROMECH 610 Colloquium. Unlike a conventional review, it focuses on the state-of-the-art and emerging research directions in these fields rather than historical viewpoints. The article covers basic definitions, design strategies, analysis techniques, and discussions of challenges and applications in each topic, offering valuable insights for early-career researchers and others interested in these areas.
Article
Engineering, Mechanical
M. Mazzotti, A. Foehr, O. R. Bilal, A. Bergamini, F. Bosia, C. Daraio, N. M. Pugno, M. Miniaci
Summary: Hierarchy provides unique opportunities for advanced material design with superior properties. However, its role in vibration mitigation and wave manipulation remains unclear. In this study, we demonstrate that designing non self-similar hierarchical geometries enables the creation of periodic structures supporting multiple highly attenuative and broadband bandgaps at different frequencies. The type of band gap mechanism is identified by examining the vibrational mode shapes and dispersion diagram of the unit cell.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Tae Hyun Kim, Zhun Zhou, Yeong Suk Choi, Vincenzo Costanza, Linghui Wang, Joong Hwan Bahng, Nicholas J. Higdon, Youngjun Yun, Hyunbum Kang, Sunghan Kim, Chiara Daraio
Summary: This study presents a flexible biomimetic thermal sensing polymer that mimics the ion transport dynamics of a plant cell wall component, pectin. By incorporating elastic fragments into a block copolymer architecture, the physicochemical properties of the polymer are engineered to make it flexible and stretchable. The thermal response of this flexible polymer outperforms current state-of-the-art temperature sensing materials.
Article
Engineering, Mechanical
Mohamed Roshdy, Tian Chen, Serge Nakhmanson, Osama R. Bilal
Summary: In this paper, the authors investigate the static and dynamic behavior of three-dimensional, dynamically tunable metamaterials. They explore the dynamic characteristics of metamaterials with variable Poisson's ratios and analyze their effectiveness in controlling elastic waves in all directions. The authors demonstrate the utility of these metamaterials in tunable multiplexing and guiding of waves at different frequencies.
EXTREME MECHANICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Tommaso Magrini, Chelsea Fox, Adeline Wihardja, Athena Kolli, Chiara Daraio
Summary: This article investigates the fracture behavior of irregular reinforcement phases in composite materials and designs a polymeric reinforcing network using a stochastic algorithm to control the microstructure. The study shows that by controlling the local architecture of materials, the fracture properties and energy dissipation can be adjusted. Additionally, by designing different reinforcing networks, the propagation and initiation of cracks can be controlled.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Linghui Wang, Tae Hyun Kim, Vincenzo Costanza, Nicholas J. Higdon, Chiara Daraio
Summary: The study reveals the remarkable temperature response of CaCl2-crosslinked pectin in terms of ionic conductivity, indicating its potential applications in wearable devices and infrared sensors. Through controlled experiments, it is found that calcium ions are the dominant current carriers and the temperature response is attributed to changes in ion mobility, rather than variations in ion number density. Comparison of different multivalent ions suggests a positive correlation between their temperature responses and their binding energy to pectin. These fundamental findings provide relevant guidance for the future design of temperature-sensitive polymers and other materials for organic electronics.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Jagannadh Boddapati, Moritz Flaschel, Siddhant Kumar, Laura De Lorenzis, Chiara Daraio
Summary: When the elastic properties of structured materials become direction-dependent, the number of descriptors required to describe their behavior increases. This presents challenges in experimental evaluation. In this paper, a methodology based on the virtual fields method is proposed to determine the six separate stiffness tensor parameters of two-dimensional anisotropic structured materials using just one tension test, eliminating the need for multiple experiments.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Berthy T. Feng, Alexander C. Ogren, Chiara Daraio, Katherine L. Bouman
Summary: This paper presents an approach to estimate the heterogeneous material properties of an object using monocular video, which can identify image-space modes and infer spatially-varying Young's modulus and density values.
2022 IEEE/CVF CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION (CVPR 2022)
(2022)
Article
Physics, Multidisciplinary
Agnes Valenti, Eliska Greplova, Netanel H. Lindner, Sebastian D. Huber
Summary: Variational methods are effective tools for approximating the ground states of complex many-body Hamiltonians. A neural-network-based variational ansatz is introduced to provide flexibility and tunability with respect to the relevant correlations governing the physics of the system. Compatible variational optimization methods are also introduced for exploring low-lying excited states without symmetries while preserving the interpretability of the ansatz.
PHYSICAL REVIEW RESEARCH
(2022)
