Flatbands from Bound States in the Continuum for Orbital Angular Momentum Localization Article Swipe

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Weiwei Zhu , Hong-yu Zou , Yong Ge , Yin Wang , Zheyu Cheng , Bingbing Wang , Shou-qi Yuan , Hong-xiang Sun , Haoran Xue , Baile Zhang ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2410.04040

A flatband material is a system characterized by energy bands with zero dispersion, allowing for the compact localization of wavefunctions in real space. This compact localization significantly enhances inter-particle correlations and light-matter interactions, leading to notable advancements such as fractional Chern insulators in condensed matter systems and flat-band lasers in photonics. Previous flatband platforms, including twisted bilayer graphene and artificial kagome/Lieb lattices, typically focused on nondegenerate flatbands, lacking access to the high degeneracy that can facilitate the localization of orbital angular momentum (OAM). Here, we propose a general framework to construct highly degenerate flatbands from bound states in the continuum (BICs)--a concept originating from quantum theory but significantly developed in photonics and acoustics in recent years. The degeneracy of flatbands is determined by the number of BICs within each unit cell in a lattice. We experimentally validate this approach in two-dimensional (2D) and three-dimensional (3D) acoustic crystals, demonstrating flatbands with 4-fold and 12-fold degeneracies, respectively. The high degeneracy provides sufficient internal degrees of freedom, enabling the selective excitation of localized OAM at any position in any direction. Our results pave the way for exploring BIC-constructed flatbands and their localization properties.

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Angular momentum Physics Bound state Classical mechanics Quantum mechanics

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2410.04040
PDF: https://arxiv.org/pdf/2410.04040
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Cited By: 1
Related Works: 10
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DOI: https://doi.org/10.48550/arxiv.2410.04040

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Title: Flatbands from Bound States in the Continuum for Orbital Angular Momentum Localization

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Type: preprint

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Language: en

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Publication year: 2024

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Publication date: 2024-10-05

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Authors: Weiwei Zhu, Hong-yu Zou, Yong Ge, Yin Wang, Zheyu Cheng, Bingbing Wang, Shou-qi Yuan, Hong-xiang Sun, Haoran Xue, Baile Zhang

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Landing page: https://arxiv.org/abs/2410.04040

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PDF URL: https://arxiv.org/pdf/2410.04040

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Concepts: Angular momentum, Physics, Bound state, Classical mechanics, Quantum mechanics

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Cited by: 1

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