Gain/Loss-free Non-Hermitian Metamaterials
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910914685435904 |
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| author | Maopeng, Wu Mingze, Weng Zhonghai, Chi Siyong, Zheng Fubei, Liu Weijia, Luo Qian, Zhao Yonggang, Meng Ji, Zhou |
| author_facet | Maopeng, Wu Mingze, Weng Zhonghai, Chi Siyong, Zheng Fubei, Liu Weijia, Luo Qian, Zhao Yonggang, Meng Ji, Zhou |
| contents | The ease of using optical gain/loss provides a fertile ground for experimental explorations of non-Hermitian (NH) physics. Without gain/loss, can we realize the NH effect in a Hermitian system? The interface between the coupled Hermitian subsystems is a natural object for NH physics due to the nonconservative process on it. However, it is still far from enduing the interface with rich NH physics. Here, a junction between the topological insulator and the conductor is considered, where the interface can be effectively described by a NH Hamiltonian--such NH character is ascribed to the conductor self-energy of a reservoir. As a consequence of that, we show the wave propagation along the interface exhibits dissipative non-reciprocity (dubbed non-Bloch transport), which was believed to be unique in NH systems. Moreover, the meta-materialization of tight-binding models is also studied by identifying their equivalent connectivity, enabling us to demonstrate the above exotic NH behavior of the interface experimentally. Our work provides a conceptually rich avenue to construct NH systems for both optics and electronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_16290 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gain/Loss-free Non-Hermitian Metamaterials Maopeng, Wu Mingze, Weng Zhonghai, Chi Siyong, Zheng Fubei, Liu Weijia, Luo Qian, Zhao Yonggang, Meng Ji, Zhou Optics The ease of using optical gain/loss provides a fertile ground for experimental explorations of non-Hermitian (NH) physics. Without gain/loss, can we realize the NH effect in a Hermitian system? The interface between the coupled Hermitian subsystems is a natural object for NH physics due to the nonconservative process on it. However, it is still far from enduing the interface with rich NH physics. Here, a junction between the topological insulator and the conductor is considered, where the interface can be effectively described by a NH Hamiltonian--such NH character is ascribed to the conductor self-energy of a reservoir. As a consequence of that, we show the wave propagation along the interface exhibits dissipative non-reciprocity (dubbed non-Bloch transport), which was believed to be unique in NH systems. Moreover, the meta-materialization of tight-binding models is also studied by identifying their equivalent connectivity, enabling us to demonstrate the above exotic NH behavior of the interface experimentally. Our work provides a conceptually rich avenue to construct NH systems for both optics and electronics. |
| title | Gain/Loss-free Non-Hermitian Metamaterials |
| topic | Optics |
| url | https://arxiv.org/abs/2408.16290 |