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
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Topological Surface Acoustic Waves
Zi-Dong Zhang,Si-Yuan Yu,Hao Ge,Ji-Qian Wang,Hong-Fei Wang,Kangfu Liu,Tao Wu,Cheng He,Ming-Hui Lu,Yan-Feng Chen +9 more
TL;DR: In this article, the authors implemented a topological insulator for surface acoustic wave (SAW) topology based on a monolithically integrated platform using a miniature acoustic resonator array working tens of megahertz on a piezoelectric halfspace.
Journal ArticleDOI
Simulating twistronics in acoustic metamaterials
TL;DR: In this paper, the authors numerically simulate twistronic behavior in acoustic metamaterials composed of interconnected air cavities in two stacked steel plates, and they reach a regime of strong interlayer tunneling where the acoustic magic angle appears as high as 6.01∘.
Journal ArticleDOI
Guiding robust valley-dependent edge states by surface acoustic waves
TL;DR: In this article, a surface acoustic wave (SAW) waveguides which utilize and transport valley pseudospins in two-dimensional SAW phononic crystals is presented, and the backscattering suppression of SAW valley-dependent edge modes transport is observed in sharply curved interfaces.
Journal ArticleDOI
Engineered electronic states in atomically precise artificial lattices and graphene nanoribbons
Linghao Yan,Peter Liljeroth +1 more
TL;DR: In this paper, the authors focus on recent progress in constructing novel, atomically precise artificial materials: artificial lattices built through atom manipulation and graphene nanoribbons (GNRs) realized by on-surface synthesis.
Posted Content
Topological Phononic Logic.
TL;DR: In this article, a topological logic gate for ultrasound was demonstrated by exploiting the large phase space of accidental degeneracies in a honeycomb lattice, and six physical parameters were used to tune these parameters to create a phononic switch between topological waveguide and a trivial insulator that can be triggered by ultrasonic heating.
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.