Observation of the magic angle and flat band physics in dipolar photonic lattices
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910673042145280 |
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| author | Román-Cortés, Diego Mazanov, Maxim Vicencio, Rodrigo A. Gorlach, Maxim A. |
| author_facet | Román-Cortés, Diego Mazanov, Maxim Vicencio, Rodrigo A. Gorlach, Maxim A. |
| contents | Evanescently coupled waveguide arrays provide a tabletop platform to realize a variety of Hamiltonians, where physical waveguides correspond to the individual sites of a tight-binding lattice. Nontrivial spatial structure of the waveguide modes enriches this picture and uncovers further possibilities. Here, we demonstrate that the effective coupling between $p$-like modes of adjacent photonic waveguides changes its sign depending on their relative orientation vanishing for a proper alignment at a so-called magic angle. Using femtosecond laser-written waveguides, we demonstrate this experimentally for $p$-mode dimers and graphene-like photonic lattices exhibiting quasi-flat bands at this angle. We observe diffraction-free propagation of corner and bulk states providing a robust experimental evidence of a two-dimensional Aharonov-Bohm-like caging in an optically switchable system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_20914 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of the magic angle and flat band physics in dipolar photonic lattices Román-Cortés, Diego Mazanov, Maxim Vicencio, Rodrigo A. Gorlach, Maxim A. Optics Mesoscale and Nanoscale Physics Evanescently coupled waveguide arrays provide a tabletop platform to realize a variety of Hamiltonians, where physical waveguides correspond to the individual sites of a tight-binding lattice. Nontrivial spatial structure of the waveguide modes enriches this picture and uncovers further possibilities. Here, we demonstrate that the effective coupling between $p$-like modes of adjacent photonic waveguides changes its sign depending on their relative orientation vanishing for a proper alignment at a so-called magic angle. Using femtosecond laser-written waveguides, we demonstrate this experimentally for $p$-mode dimers and graphene-like photonic lattices exhibiting quasi-flat bands at this angle. We observe diffraction-free propagation of corner and bulk states providing a robust experimental evidence of a two-dimensional Aharonov-Bohm-like caging in an optically switchable system. |
| title | Observation of the magic angle and flat band physics in dipolar photonic lattices |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.20914 |