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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Boundary configured chiral edge states in valley topological photonic crystal.
TL;DR: In this article , parallel and antiparallel chiral edge states (CESs) are demonstrated at the external boundary of a valley photonic crystal (VPC), with flexibly tunable group velocity and frequency range by adjusting the boundary structure.
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Out-of-plane wave propagation in two-dimensional micro-lattices
Journal ArticleDOI
Topological Metamaterials.
TL;DR: Topological properties of an object, associated with an integer called the topological invariant, are global features that cannot change continuously but only through abrupt variations, hence granting them intrinsic robustness as discussed by the authors .
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Perspective: Acoustic metamaterials in future engineering
TL;DR: In this article , the authors review recent developments in AMMs with a focus on their future engineering, especially in the most promising fields of sound absorption/isolation, acoustic imaging, cloaking, and so on, furthermore, they outline the opportunities and challenges they are encountering.
Journal ArticleDOI
Observing movement of Dirac cones from single-photon dynamics
Yong-Heng Lu,Yong-Heng Lu,Yao Wang,Yao Wang,Yi-Jun Chang,Yi-Jun Chang,Zhan-Ming Li,Zhan-Ming Li,Wen-Hao Cui,Wen-Hao Cui,Jun Gao,Jun Gao,Wen-Hao Zhou,Wen-Hao Zhou,Hang Zheng,Xian-Min Jin,Xian-Min Jin +16 more
TL;DR: In this paper, the authors demonstrate a direct observation of the movement of Dirac cones from single-photon dynamics in photonic graphene under different biaxial strains, by dynamically detecting the edge modes and extracting the diffusing distance of the packets with accumulation and statistics on individual single particle registrations.
References
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Journal ArticleDOI
Two-dimensional gas of massless Dirac fermions in graphene
Kostya S. Novoselov,A. K. Geim,Sergey V. Morozov,Da Jiang,Mikhail I. Katsnelson,Irina V. Grigorieva,S. V. Dubonos,A. A. Firsov +7 more
TL;DR: This study reports an experimental study of a condensed-matter system (graphene, a single atomic layer of carbon) in which electron transport is essentially governed by Dirac's (relativistic) equation and reveals a variety of unusual phenomena that are characteristic of two-dimensional Dirac fermions.
Journal ArticleDOI
A roadmap for graphene
Kostya S. Novoselov,Vladimir I. Fal'ko,Luigi Colombo,Paul Gellert,M. G. Schwab,Kyoung-Soo Kim +5 more
TL;DR: This work reviews recent progress in graphene research and in the development of production methods, and critically analyse the feasibility of various graphene applications.
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Chiral tunnelling and the Klein paradox in graphene
TL;DR: In this paper, it was shown that the Klein paradox can be tested in a conceptually simple condensed-matter experiment using electrostatic barriers in single and bi-layer graphene, showing that quantum tunnelling in these materials becomes highly anisotropic, qualitatively different from the case of normal, non-relativistic electrons.
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Anomalous diffusion in disordered media: Statistical mechanisms, models and physical applications
TL;DR: In this article, the authors consider the specific effects of a bias on anomalous diffusion, and discuss the generalizations of Einstein's relation in the presence of disorder, and illustrate the theoretical models by describing many physical situations where anomalous (non-Brownian) diffusion laws have been observed or could be observed.
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Approaching ballistic transport in suspended graphene.
TL;DR: This work shows that the fluctuations are significantly reduced in suspended graphene samples and reports low-temperature mobility approaching 200,000 cm2 V-1 s-1 for carrier densities below 5 x 109 cm-2, which cannot be attained in semiconductors or non-suspended graphene.