Journal ArticleDOI
Surface phononic graphene.
Si-Yuan Yu,Xiaochen Sun,Xu Ni,Qing Wang,Xue-Jun Yan,Cheng He,Xiaoping Liu,Liang Feng,Ming-Hui Lu,Yan-Feng Chen +9 more
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TLDR
The demonstrated fully integrated artificial phononic graphene platform here constitutes a step towards on-chip quantum simulators of graphene and unique monolithic electro-acoustic integrated circuits.Abstract:
Strategic manipulation of wave and particle transport in various media is the key driving force for modern information processing and communication. In a strongly scattering medium, waves and particles exhibit versatile transport characteristics such as localization, tunnelling with exponential decay, ballistic, and diffusion behaviours due to dynamical multiple scattering from strong scatters or impurities. Recent investigations of graphene have offered a unique approach, from a quantum point of view, to design the dispersion of electrons on demand, enabling relativistic massless Dirac quasiparticles, and thus inducing low-loss transport either ballistically or diffusively. Here, we report an experimental demonstration of an artificial phononic graphene tailored for surface phonons on a LiNbO3 integrated platform. The system exhibits Dirac quasiparticle-like transport, that is, pseudo-diffusion at the Dirac point, which gives rise to a thickness-independent temporal beating for transmitted pulses, an analogue of Zitterbewegung effects. The demonstrated fully integrated artificial phononic graphene platform here constitutes a step towards on-chip quantum simulators of graphene and unique monolithic electro-acoustic integrated circuits.read more
Citations
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Topological chiral phonons in center-stacked bilayer triangle lattices.
TL;DR: This work finds chiral phonons with nontrivial topology in center-stacked bilayer triangle lattices and finds that the phonon chirality remain robust with changing sublattice mass ratio and interlayer coupling.
Journal ArticleDOI
Elastic Phased Diffraction Gratings for Manipulation of Ultrasonic Guided Waves in Solids
Zhenhua Tian,Lingyu Yu +1 more
TL;DR: In this article, an elastic phased diffraction gratings, passive structures for controlling guided ultrasonic waves in solids, are presented, which adopts an array of interchangeable superstrates to modulate wave dispersion, and thus the diffraction wave field.
Journal ArticleDOI
Emergent Optical Phononic Modes upon Nanoscale Mesogenic Phase Transitions
Dima Bolmatov,Mikhail Zhernenkov,Lewis Sharpnack,Dena Mae Agra-Kooijman,Satyendra Kumar,Satyendra Kumar,Alexey Suvorov,Ron Pindak,Yong Q. Cai,Alessandro Cunsolo +9 more
TL;DR: High contrast IXS measurements on a liquid crystal sample, D7AOB, found that terahertz phononic excitations persist in the crystal, smectic A, and isotropic phases and represents a new opportunity to manipulate optomechanical properties of soft metamaterials.
Journal ArticleDOI
A higher-order topological insulator with wide bandgaps in Lamb-wave systems
TL;DR: In this article, the authors demonstrate that higher-order topological insulators with C4 symmetry can be realized in two-dimensional elastic phononic crystals by tuning the crystalline symmetry in a hierarchical structure.
Journal ArticleDOI
Observation of an unpaired photonic Dirac point
Gui-Geng Liu,Peiheng Zhou,Yihao Yang,Haoran Xue,Xin Ren,Xiao Lin,Hong-xiang Sun,Lei Bi,Yidong Chong,Baile Zhang +9 more
TL;DR: In this paper, the first unpaired Dirac point in a planar two-dimensional photonic crystal was observed, where a parity-breaking parameter was fine-tuned to a topological transition between a photonic Chern insulator and a conventional photonic insulator phase.
References
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