Zero-index metamaterials for Dirac fermion in graphene

Ren, Yinghui; Wan, Pengcheng; Zhou, Ling; Zhao, Ruihuang; Wang, Qianjing; Huang, Di; Guo, Haiqin; Du, Junjie

doi:10.1103/physrevb.103.085431

Cited by 8 publications

(4 citation statements)

References 67 publications

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“…Thus, the circuit-based ZIMs introduced here may be extended to high-frequency regimes. In addition, due to the similarity of waves, ZIMs and their novel physical properties have been successfully applied to acoustic [169][170][171][172], electronic [173] and thermal [174,175] systems. For conventional cavities, the resonant frequency strongly depends on the shape and size of the cavity.…”

Section: Circuit-based Zimsmentioning

confidence: 99%

Zero-index and hyperbolic metacavities: fundamentals and applications

Guo

Jiang

Chen

2021

J. Phys. D: Appl. Phys.

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As a basic building block, optical resonant cavities (ORCs) are widely used in light manipulation. They can confine electromagnetic waves and improve the interaction between light and matter, which also plays an important role in cavity quantum electrodynamics, nonlinear optics and quantum optics. In recent years, the rise of metamaterials, artificial materials composed of subwavelength unit cells, has greatly enriched the design and functionality of ORCs. Here, we review zero-index hyperbolic metamaterials for constructing novel ORCs. First, this paper introduces the classification and implementation of zero-index hyperbolic metamaterials. Second, the distinctive properties of zero-index and hyperbolic cavities are summarized, including geometric invariance, homogeneous/inhomogeneous field distribution, topological protection (anomalous scaling law, size independence, continuum of higher-order modes, and dispersionless modes) for zero-index (hyperbolic) metacavities. Finally, the paper introduces some typical applications of zero-index and hyperbolic metacavities, and advances the research of metacavities.

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Section: Circuit-based Zimsmentioning

confidence: 99%

Zero-index and hyperbolic metacavities: fundamentals and applications

Guo

Jiang

Chen

2021

J. Phys. D: Appl. Phys.

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“…Electron optics in semiconductor structures are naturally extended to graphene. Both naturally-occurring and nonnaturally-occurring optical phenomena such as Goos-Hanchen shift [2], self collimation [3], whispering-gallery modes [4][5][6][7][8], negative-index [9][10][11][12] and zero-index [13] behaviors of electrons, can be reproduced by graphene electrons. Accordingly, various optics-inspired functional units, such as two-dimensional electron microscopies [14,15], quantum switches [16][17][18], Fabry-Pérot cavities [19], electron waveguides [20][21][22], splitters [23,24] and Vesolago lens [10][11][12], have been demonstrated.…”

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confidence: 99%

Metasurface electron optics in graphene

Zhao¹,

Wan²,

Zhou³

et al. 2022

Preprint

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The propagation effect is so far the only available implementation mechanism when electronic components in graphene are developed based on Dirac fermion optics. The resulting optics-inspired components are large in size and operate normally only in the lowest possible temperature environment so that the ballistic limits are not violated. Here electron metasurfaces based on the generalized Snell's law, a linear array of gate-bias-controlled circular quantum dots in form, are proposed to manipulate graphene electrons within the distance of the quantum-dot diameter, far less than the ballistic limits at room temperature. This provides opportunities to create untracompact optics-inspired components which are comparable in size to components arising from other principles and hence can operate at any temperature below room temperature. Moreover, unlike their optical counterparts, electron metasurfaces have near-perfect operation efficiencies and their high tunability allows for free and fast switching among functionalities. The conceptually new metasurfaces open up a promising avenue to pull optics-inspired components to a desired level of performance and flexibility.

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“…In this regard, we investigate the photonic-like devices based on graphene in which electrons exhibit optical-like transport behavior. − Optic-like transport in graphene means that electrons in graphene are similar to light in the transmission process. This enables the studies of the transport behavior of light in electronic devices, such as negative refraction, , Goos-Hanchen Effect, transformation optics, Klein tunneling, , zero-index metamaterials, Veselago lensing, directed emission in photonic-like cavities, electronic metamaterial, and the Hartman effect. , The coherence length can be over more than 28 μm in graphene grown by chemical vapor deposition . The difference is that carriers in graphene are described by the Dirac equation, and the wavelength of carriers is 300 times smaller than that of photons at the same energy.…”

mentioning

confidence: 99%

“…19−21 Optic-like transport in graphene means that electrons in graphene are similar to light in the transmission process. This enables the studies of the transport behavior of light in electronic devices, such as negative refraction, 19,20 Goos-Hanchen Effect, 22 transformation optics, 23 Klein tunneling, 24,25 zero-index metamaterials, 26 Veselago lensing, 27 directed emission in photonic-like cavities, 28 electronic metamaterial, 29 and the Hartman effect. 30,31 The coherence length can be over more than 28 μm in graphene grown by chemical vapor deposition.…”

mentioning

confidence: 99%