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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Hermitian and Non-Hermitian Dirac-Like Cones in Photonic and Phononic Structures
TL;DR: In this paper , an overview of the accidental degeneracy-induced Dirac-like cones at the center of the Brillouin zone in both photonic and phononic structures, including the fundamental physics, effective medium description and experimental demonstration, as well as current challenges and future directions.
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Observation of Dirac Hierarchy in Three-Dimensional Acoustic Topological Insulators
TL;DR: In this paper , the first experimental observation of the Dirac hierarchy in 3D acoustic topological insulators was reported, which not only expands the fundamental research scope of Dirac physics, but also opens up a new route for multidimensional robust wave manipulation.
Journal ArticleDOI
Broadband topological valley-projected edge-states transport in composite structure phononic crystal
TL;DR: In this article, a composite structure composed of the atoms with different shapes forming a hexagonal lattice is presented, which can achieve larger bandwidth than a single structure, and the results demonstrate that the topological protected edge states are also observed in the structure.
Journal ArticleDOI
Observing flat wavefront formation with diffusive transport in microwave graphene with topological insulator protected edges
TL;DR: In this article, the authors show that by adopting valley-constrained photonic topological insulator (PTI) protected borders and PTI waveguide, the proper modes are preserved, and they are able to experimentally observe the uniform wavefront generated in an all-dielectric microwave graphene bulk within a few wavelengths.
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Acoustic twisted bilayer graphene
TL;DR: In this paper, the authors presented a simple platform to mimic the behavior of twisted van der Waals (vdW) heterostructures using acoustic metamaterials comprising of interconnected air cavities in a steel plate.
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.
Journal ArticleDOI
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.