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Article
Materials Science, Composites
Qian Wu et al.
Summary: In this study, a non-Hermitian micropolar metabeam with piezoelectric elements and electronic nonlocal feed-forward control is investigated. The metabeam supports nonreciprocal flexural wave propagation and exhibits non-Hermitian skin effect. The nonlocal effect is considered in the modeling to engineer anomalous wave dispersion. This nonlocal micropolar metabeam could pave the way for designing non-Hermitian topological mechanical metamaterials.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mohamed Shaat et al.
Summary: There is significant interest in studying the functionality of odd elastic solids, which are a specific class of active matter that cannot be described by a free energy function. This paper proposes the coupling of non-symmetric elasticity with chiral, nonreciprocal elasticity as a means to achieve isotropic elastic solids exhibiting non-symmetric elasticity.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Qian Wu et al.
Summary: A class of active metamaterial with odd mass density tensor is presented, where the asymmetric part of the density arises from active and nonconservative forces. The odd mass density is realized using metamaterials with inner resonators connected by asymmetric and programmable control. Experimental validation shows that the odd mass in active solids leads to wave anisotropy and directional wave energy gain.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Review
Physics, Condensed Matter
Michel Fruchart et al.
Summary: Elasticity refers to a material's ability to store energy, while viscosity refers to its tendency to dissipate energy. However, there are fluids and solids that display additional linear response coefficients known as odd viscosity and odd elasticity. This review discusses the continuum perspective of odd viscosity and odd elasticity, their rich phenomenology, and various systems that exhibit them. Additionally, it comments on the microscopic mechanisms underlying their emergence.
ANNUAL REVIEW OF CONDENSED MATTER PHYSICS
(2023)
Article
Engineering, Mechanical
Abhishek Gupta et al.
Summary: Boosting signals with amplification mechanisms is common, but attenuating mechanisms are less desired due to their negative impacts on efficiency. However, a new viewpoint suggests that attenuation can be used as a design element to enhance actuation force while maintaining signal quality. This study demonstrates the concept by designing a non-Hermitian metamaterial and provides a proof-of-principle for the design of reconfigurable nano-indenters and robotic actuators.
EXTREME MECHANICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Zhongming Gu et al.
Summary: The observation of non-Hermitian skin effect (NHSE) often requires gain medium, but we demonstrate a method using a passive system to observe the complete evolution picture. By creating virtual gain effect, we successfully achieve NHSE in a passive system and observe transient NHSE in a short time window.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Wei Wang et al.
Summary: The non-Hermitian skin effect (NHSE) is utilized to reshape the wavefunctions of topological modes (TMs) by delocalizing them from the boundary. The in-gap TMs become completely extended and form robust extended modes, protected by bulk-band topology, even against local disorders. Experimental realization in different topological lattices demonstrates the deformation of TMs into various shapes.
Article
Multidisciplinary Sciences
Tzer Han Tan et al.
Summary: Researchers have discovered that swimming starfish embryos can spontaneously assemble into chiral crystals that persist for hours. The formation, dynamics, and dissolution of these living crystals are controlled by the hydrodynamic properties and natural development of the embryos. The living chiral crystals exhibit self-sustained chiral oscillations and unconventional deformation response behaviors, providing direct experimental evidence for the role of non-reciprocal interactions between multicellular organisms in non-equilibrium phases of chiral active matter.
Article
Physics, Multidisciplinary
Qian Wu et al.
Summary: This paper introduces a linear active metalayer that can convert the wave frequency of a flexural incidence into arbitrary frequencies of transmitted waves. The active element, involving piezoelectric components and time-modulated transfer function, breaks energy conservation and allows for linear and independent frequency conversion. Phase-gradient and frequency-gradient metalayers are proposed for wave steering and dynamic beam steering, respectively, using time-modulated units.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Penglin Gao et al.
Summary: This research has identified stable unidirectional Rayleigh surface waves in active materials, which exhibit non-reciprocal and non-Hermitian characteristics, unlike waves in passive solids. These findings may open up new possibilities for manipulating elastic waves in unconventional ways.
COMMUNICATIONS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jianlin Yi et al.
Summary: This study investigates the effect of structural periodicity on wave propagation in elastic metamaterials and reveals the connection between finite and infinite periodic PT symmetric systems. Particularly, the formation of coherent perfect absorbers and lasers in elastic metamaterials is studied, providing simple equations to estimate periodicity and minimum cell number.
Article
Physics, Multidisciplinary
Wen Cheng et al.
Summary: This study found that smart materials with designed feedback mechanisms can achieve odd elasticity, providing a practical platform for analyzing phenomena related to this novel elasticity theory. Additionally, a method for designing a non-reciprocal Rayleigh wave using odd elasticity was demonstrated, along with an examination of the electric energy scenario.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Multidisciplinary Sciences
Yangyang Chen et al.
Summary: Mechanical metamaterials exhibit unique properties not found in ordinary materials, such as active metamaterials with self-sensing characteristics demonstrated by the authors. These active metamaterials can convert electrical energy into mechanical work, and their odd modulus allows for localized vibrational modes at sample boundaries.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Colin Scheibner et al.
Article
Physics, Multidisciplinary
H. Nassar et al.
PHYSICAL REVIEW LETTERS
(2020)
Article
Materials Science, Multidisciplinary
G. Carta et al.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2020)
Article
Physics, Multidisciplinary
Matheus I. N. Rosa et al.
NEW JOURNAL OF PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
Massimo Moccia et al.
Article
Physics, Multidisciplinary
Colin Scheibner et al.
PHYSICAL REVIEW LETTERS
(2020)
Article
Acoustics
Qian Wu et al.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2019)
Article
Materials Science, Multidisciplinary
H. Nassar et al.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2019)
Article
Multidisciplinary Sciences
Martin Brandenbourger et al.
NATURE COMMUNICATIONS
(2019)
Article
Mechanics
Hassan Bahaloo et al.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2019)
Article
Materials Science, Multidisciplinary
H. Chen et al.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2018)
Review
Physics, Multidisciplinary
Ramy El-Ganainy et al.
Article
Materials Science, Multidisciplinary
Graeme Walter Milton
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2013)
Article
Materials Science, Multidisciplinary
X. N. Liu et al.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2012)
Article
Multidisciplinary Sciences
Graeme W. Milton et al.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2007)
