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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Imaging an Acoustic Topological Edge Mode on a Patterned Substrate with Microwave Impedance Microscopy
Yoichi Nii,Yoshinori Onose +1 more
TL;DR: In this paper , the authors used innovative microscopy to visualize topological acoustic edge states at frequencies as high as 2.4 GHz on a patterned substrate, which bodes well for the feasibility of topological surface-acoustic-wave devices.
Journal ArticleDOI
Tunable Topological Surface States of Three-Dimensional Acoustic Crystals
TL;DR: In this paper, a three-dimensional topological acoustic crystal with a large complete band gap was constructed based on the band folding and breaking mechanism by building blocks with acoustic atoms, which can tune the original gapped symmetry and anti-symmetry surface states in a gapless fashion at the boundaries of surface Brillouin zone, acting as omnidirectional acoustic quantum spin Hall effect.
Journal ArticleDOI
One-step polymeric phononic crystal manufacture.
TL;DR: One of the signature characteristics of phononic crystal, the slow wave effect, was expressed by this polymer and this work provides a methodology for rapid accessing a new type of adaptable phononic crystals based on flexible polymers.
Observing Zitterbewegung with Ultracold Atoms
J. Y. Vaishnav,Charles W. Clark +1 more
TL;DR: In this paper, an optical lattice scheme was proposed for the experimental observation of Zitterbewegung (ZB) with ultracold, neutral atoms, and it was shown that the ZB should occur at experimentally accessible frequencies and amplitudes.
Journal ArticleDOI
Size-dependent wave propagation in two-dimensional functionally graded lattice materials
TL;DR: In this paper , a modified strain gradient theory was used to model two-dimensional planar lattices of hexagonal and triangular architectures made of functionally graded materials, and the effect of the functionally graded distribution of materials on the wave-propagation and wave-filtering performances of such structures was studied.
References
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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
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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.