Výsledky vyhledávání - "Pi-Gang Luan"

Akademický článek

Autor: Yanan Wang, Hai-Xiao Wang, Li Liang, Weiwei Zhu, Longzhen Fan, Zhi-Kang Lin, Feifei Li, Xiao Zhang, Pi-Gang Luan, Yin Poo, Jian-Hua Jiang, Guang-Yu Guo

Publikováno v: Nature Communications, Vol 14, Iss 1, Pp 1-9 (2023)

Abstract Topologically protected photonic edge states offer unprecedented robust propagation of photons that are promising for waveguiding, lasing, and quantum information processing. Here, we report on the discovery of a class of hybrid topological

Externí odkaz: https://doaj.org/article/89ac52d52f9c4b8fbbd1c55603b2c80a

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Akademický článek

Electromagnetic energy density in hyperbolic metamaterials

Autor: Afshin Moradi, Pi-Gang Luan

Publikováno v: Scientific Reports, Vol 12, Iss 1, Pp 1-11 (2022)

Abstract We present the theory of electromagnetic energy propagation through a dispersive and absorbing hyperbolic metamaterial (HMM). In this way, the permittivity tensor components of HMM (especially, nanowire HMM) may appear to be hopeless, but as

Externí odkaz: https://doaj.org/article/ec250325094f44b5a4a0a8be232a2563

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Akademický článek

Effective Electrodynamics Theory for the Hyperbolic Metamaterial Consisting of Metal–Dielectric Layers

Autor: Pi-Gang Luan

Publikováno v: Crystals, Vol 10, Iss 10, p 863 (2020)

In this work, we study the dynamical behaviors of the electromagnetic fields and material responses in the hyperbolic metamaterial consisting of periodically arranged metallic and dielectric layers. The thickness of each unit cell is assumed to be mu

Externí odkaz: https://doaj.org/article/b1ce8cc063264ceabe641e449f0341e1

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Akademický článek

On the possibility of superluminal energy propagation in a hyperbolic metamaterial of metal-dielectric layers

Autor: Pi-Gang Luan, Jie-Luen Wu

Publikováno v: AIP Advances, Vol 8, Iss 1, Pp 015106-015106-12 (2018)

The energy propagation of electromagnetic fields in the effective medium of a one-dimensional photonic crystal consisting of dielectric and metallic layers is investigated. We show that the medium behaves like Drude and Lorentz medium, respectively,

Externí odkaz: https://doaj.org/article/c4a52ee2bcb64d309a208c877453cd08

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Akademický článek

Bubbly Water as a Natural Metamaterial of Negative Bulk-Modulus

Autor: Pi-Gang Luan

Publikováno v: Crystals, Vol 9, Iss 9, p 457 (2019)

In this study, an oscillator model of bubble-in-water is proposed to analyze the effective modulus of low-concentration bubbly water. We show that in a wide range of wave frequency the bubbly water acquires a negative effective modulus, while the eff

Externí odkaz: https://doaj.org/article/3561ae3232cb436a97e684ae497e94c3

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Akademický článek

Topological Phase Transition in a One-Dimensional Elastic String System

Autor: Ya-Wen Tsai, Yao-Ting Wang, Pi-Gang Luan, Ta-Jen Yen

Publikováno v: Crystals, Vol 9, Iss 6, p 313 (2019)

We show that topological interface mode can emerge in a one-dimensional elastic string system which consists of two periodic strings with different band topologies. To verify their topological features, Zak-phase of each band is calculated and reveal

Externí odkaz: https://doaj.org/article/8114d0b837384020869bc970df647ad2

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Akademický článek

Coriolis force induced topological order for classical mechanical vibrations

Autor: Yao-Ting Wang, Pi-Gang Luan, Shuang Zhang

Publikováno v: New Journal of Physics, Vol 17, Iss 7, p 073031 (2015)

We show that topological order and vibrational edge modes can exist in a classical mechanical system consisting of a two-dimensional honeycomb lattice of masses and springs. The band structure shows the existence of Dirac cones and unconventional edg

Externí odkaz: https://doaj.org/article/525bf90633d84d5c81d2c54db9645e51

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