Complex Spatiotemporal Modulations and Non-Hermitian Degeneracies in PT-Symmetric Phononic Materials

Article Physics, Applied

Design and experimental demonstration of effective acoustic gain medium for PT-symmetric refractive index

Wen-Jie Yang et al.

Summary: In this paper, we propose a S-shaped waveguide model with a wave modulator to achieve an effective acoustic gain medium. We also present a practical approach to construct the on-demand PT-symmetric refractive index period.

APPLIED PHYSICS LETTERS (2022)

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Article Acoustics

Closed-form existence conditions for bandgap resonances in a finite periodic chain under general boundary conditions

Mary V. Bastawrous et al.

Summary: This paper presents the existence conditions for bandgap resonances in discrete diatomic chains and investigates the transition phenomena under different boundary conditions and parity. The proposed analysis method is applicable to linear periodic chains and continuous granular media models.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2022)

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Article Materials Science, Multidisciplinary

Harnessing PT-symmetry in non-Hermitian stiffness-modulated waveguides

Emanuele Riva

Summary: This paper investigates a non-Hermitian and PT-symmetric elastic waveguide with complex stiffness-modulation, which exhibits a transition from unbroken to broken PT-symmetric phases by controlling the strength of balanced gain/loss. In the unbroken PT-symmetric regime, the waveguide acts as a phononic filter, while in the broken regime it operates as a waveguide with asymmetric scattering capabilities.

PHYSICAL REVIEW B (2022)

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Article Materials Science, Multidisciplinary

Exceptional points and enhanced sensitivity in PT-symmetric continuous elastic media

Matheus INc Rosa et al.

Summary: The study focuses on exceptional points in continuous elastic media and their potential application in detecting mass and stiffness perturbations. By introducing balanced gain and loss to induce degenerate states, the sensitivity of the system is enhanced, making it promising for applications involving sensing of disturbances such as point masses and surface cracks.

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS (2021)

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Article Optics

Spatiotemporal plane wave expansion method for arbitrary space-time periodic photonic media

Jagang Park et al.

Summary: The study presents a systematic method for calculating the photonic band structures and mode field profiles of arbitrary space-time periodic media, applied to a photonic crystal to predict phenomena such as opening of frequency and momentum gaps. This method enables systematic investigation of various optical phenomena in space-time periodic media.

OPTICS LETTERS (2021)

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Article Multidisciplinary Sciences

Chiral mode transfer of symmetry-broken states in anti-parity-time-symmetric mechanical system

Linlin Geng et al.

Summary: This article investigates the implementation of APT symmetry in a mechanical system and finds that dynamically encircling an exceptional point in an APT-symmetric system can lead to chiral mode switching. These findings offer new opportunities for wave manipulation in mechanical systems.

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2021)

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Review Physics, Multidisciplinary

A review on the transmission of COVID-19 based on cough/sneeze/breath flows

Mouhammad El Hassan et al.

Summary: The COVID-19 pandemic has significantly impacted society, emphasizing the importance of understanding disease transmission dynamics in limiting spread. Studies on human airflow dynamics play a crucial role in predicting virus transmission through air. Experimental and numerical research have shown that factors such as particle sizes and flow turbulence influence the spread of the virus. Additionally, investigating the effectiveness of facemasks in preventing COVID-19 transmission is of great interest.

EUROPEAN PHYSICAL JOURNAL PLUS (2021)

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Review Physics, Applied

Controlling Sound in Non-Hermitian Acoustic Systems

Zhongming Gu et al.

Summary: This article reviews the recent developments of non-Hermitian physics in acoustics, including basic concepts, mathematical tools, wave manipulation abilities, and the study of topological systems, while also looking ahead to potential future directions and applications.

PHYSICAL REVIEW APPLIED (2021)

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Article Physics, Applied

Non-Hermitian elastic waveguides with piezoelectric feedback actuation: non-reciprocal bands and skin modes

Danilo Braghini et al.

Summary: This work investigates non-Hermitian elastic waveguides with periodically applied proportional feedback efforts, showing non-reciprocal frequency components in dispersion diagrams and the effects of feedback sign and locality on wave propagation. The results contribute to designing metamaterials with novel properties and potential technological applications.

JOURNAL OF PHYSICS D-APPLIED PHYSICS (2021)

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Article Physics, Applied

Nonreciprocal Elastic Wave Beaming in Dynamic Phased Arrays

M. Moghaddaszadeh et al.

Summary: Beam forming using phased arrays is fundamental to various sonar communication and biomedical imaging techniques. However, current arrays are limited by wave reciprocity and operational frequencies, hindering advancements in the field. The study presents nonreciprocal phased arrays that operate independently in different directions and frequency channels, offering enhanced capabilities in guided wave engineering. This system utilizes transceiving piezoelectric wafer discs bonded to an elastic medium with dynamic modulation, allowing concurrent phononic transitions in energy and momentum spaces to overcome Lorentz reciprocity constraints. The experimental demonstration validates the theoretical analysis of the array and its capabilities.

PHYSICAL REVIEW APPLIED (2021)

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Article Physics, Applied

Experimental Observation of Nonreciprocal Waves in a Resonant Metamaterial Beam

M. A. Attarzadeh et al.

PHYSICAL REVIEW APPLIED (2020)

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Non-Reciprocal Metamaterials With Simultaneously Time-Varying Stiffness and Mass

Jiahui Huang et al.

JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME (2020)

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Review Optics

Review of exceptional point-based sensors

Jan Wiersig

PHOTONICS RESEARCH (2020)

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Nonreciprocity in acoustic and elastic materials

Hussein Nassar et al.

NATURE REVIEWS MATERIALS (2020)

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Parity-time Symmetry Based on Time Modulation

Huanan Li et al.

PHYSICAL REVIEW APPLIED (2020)

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Scattering singularities of optical waveguides under complex modulation

Qingjie Liu et al.

PHYSICAL REVIEW A (2020)

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Time-Periodic Stiffness Modulation in Elastic Metamaterials for Selective Wave Filtering: Theory and Experiment

Giuseppe Trainiti et al.

PHYSICAL REVIEW LETTERS (2019)

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Review Chemistry, Physical

Parity-time symmetry and exceptional points in photonics

S. K. Ozdemir et al.

NATURE MATERIALS (2019)

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Asymmetric scattering of flexural waves in a parity-time symmetric metamaterial beam

Qian Wu et al.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2019)

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Article Acoustics

Non-reciprocal wave phenomena in energy self-reliant gyric metamaterials

M. A. Attarzadeh et al.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2019)

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Article Multidisciplinary Sciences

Dispersion and topological characteristics of permutative polyatomic phononic crystals

H. Al Ba'ba'a et al.

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2019)

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Broadband Nonreciprocal Amplification in Luminal Metamaterials

E. Galiffi et al.

PHYSICAL REVIEW LETTERS (2019)

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A time-varying mass metamaterial for non-reciprocal wave propagation

Jiahui Huang et al.

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES (2019)

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Direction-dependent parity-time phase transition and nonreciprocal amplification with dynamic gain-loss modulation

Alex Y. Song et al.

PHYSICAL REVIEW A (2019)

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Article Instruments & Instrumentation

Application of magnetoelastic materials in spatiotemporally modulated phononic crystals for nonreciprocal wave propagation

M. H. Ansari et al.

SMART MATERIALS AND STRUCTURES (2018)

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Article Acoustics

On the wave dispersion and non-reciprocal power flow in space-time traveling acoustic metamaterials

M. A. Attarzadeh et al.

APPLIED ACOUSTICS (2018)

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Non-reciprocal elastic wave propagation in 2D phononic membranes with spatiotemporally varying material properties

M. A. Attarzadeh et al.

JOURNAL OF SOUND AND VIBRATION (2018)

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Photonic Floquet media with a complex time-periodic permittivity

Neng Wang et al.

PHYSICAL REVIEW B (2018)

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Parametric amplification and bidirectional invisibility in PT-symmetric time-Floquet systems

Theodoros T. Koutserimpas et al.

PHYSICAL REVIEW A (2018)

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A Bloch-based procedure for dispersion analysis of lattices with periodic time-varying properties

Javier Vila et al.

JOURNAL OF SOUND AND VIBRATION (2017)

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Pole distribution in finite phononic crystals: Understanding Bragg-effects through closed-form system dynamics

H. Al Ba'ba'a et al.

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA (2017)

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Article Materials Science, Multidisciplinary

Modulated phononic crystals: Non-reciprocal wave propagation and Willis materials

H. Nassar et al.

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS (2017)

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Article Multidisciplinary Sciences

Non-reciprocal wave propagation in modulated elastic metamaterials

H. Nassar et al.

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2017)

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An Investigation of Vibrational Power Flow in One-Dimensional Dissipative Phononic Structures

H. Al Ba'ba'a et al.

JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME (2017)

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Non-reciprocal elastic wave propagation in spatiotemporal periodic structures

G. Trainiti et al.

NEW JOURNAL OF PHYSICS (2016)

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Parity-Time Synthetic Phononic Media

J. Christensen et al.

PHYSICAL REVIEW LETTERS (2016)

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An invisible acoustic sensor based on parity-time symmetry

Romain Fleury et al.

Nature Communications (2015)

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Parity-time symmetry and variable optical isolation in active-passive-coupled microresonators

Long Chang et al.

NATURE PHOTONICS (2014)

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Parity-time-symmetric microring lasers

Hossein Hodaei et al.

SCIENCE (2014)

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PT-Symmetric Acoustics

Xuefeng Zhu et al.

PHYSICAL REVIEW X (2014)

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Experimental demonstration of a unidirectional reflectionless parity-time metamaterial at optical frequencies

Liang Feng et al.

NATURE MATERIALS (2013)

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The influence of material properties on the elastic band structures of one-dimensional functionally graded phononic crystals

Xing-liang Su et al.

JOURNAL OF APPLIED PHYSICS (2012)

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Bragg solitons in nonlinear PT-symmetric periodic potentials

Mohammad-Ali Miri et al.

PHYSICAL REVIEW A (2012)

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Unconventional modes in lasers with spatially varying gain and loss

Li Ge et al.

PHYSICAL REVIEW A (2011)

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Nonlinearly PT-symmetric systems: Spontaneous symmetry breaking and transmission resonances

Andrey E. Miroshnichenko et al.

PHYSICAL REVIEW A (2011)

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Observation of parity-time symmetry in optics

Christian E. Rueter et al.

NATURE PHYSICS (2010)

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PT-symmetric optical lattices

Konstantinos G. Makris et al.

PHYSICAL REVIEW A (2010)

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Evanescent Bloch waves and the complex band structure of phononic crystals

Vincent Laude et al.

PHYSICAL REVIEW B (2009)

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Complete band gaps in two-dimensional phononic crystal slabs

A. Khelif et al.

PHYSICAL REVIEW E (2006)

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Efficient formulation for band-structure calculations of two-dimensional phononic-crystal plates

Jin-Chen Hsu et al.

PHYSICAL REVIEW B (2006)

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Review Mathematics, Applied

The quadratic eigenvalue problem

F Tisseur et al.

SIAM REVIEW (2001)

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Complex Spatiotemporal Modulations and Non-Hermitian Degeneracies in PT-Symmetric Phononic Materials

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