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Photonic topological insulator in synthetic dimensions

机译：综合尺寸的光子拓扑绝缘体

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Topological phases enable protected transport along the edges of materials, offering immunity against scattering from disorder and imperfections. These phases have been demonstrated for electronic systems, electromagnetic waves(1-5), cold atoms(6,7), acoustics(8) and even mechanics(9), and their potential applications include spintronics, quantum computing and highly efficient lasers(10-12). Typically, the model describing topological insulators is a spatial lattice in two or three dimensions. However, topological edge states have also been observed in a lattice with one spatial dimension and one synthetic dimension (corresponding to the spin modes of an ultracold atom(13-15)), and atomic modes have been used as synthetic dimensions to demonstrate lattice models and physical phenomena that are not accessible to experiments in spatial lattices(13,16,17). In photonics, topological lattices with synthetic dimensions have been proposed for the study of physical phenomena in high dimensions and interacting photons(18-22), but so far photonic topological insulators in synthetic dimensions have not been observed. Here we demonstrate experimentally a photonic topological insulator in synthetic dimensions. We fabricate a photonic lattice in which photons are subjected to an effective magnetic field in a space with one spatial dimension and one synthetic modal dimension. Our scheme supports topological edge states in this spatial-modal lattice, resulting in a robust topological state that extends over the bulk of a two-dimensional real-space lattice. Our system can be used to increase the dimensionality of a photonic lattice and induce long-range coupling by design, leading to lattice models that can be used to study unexplored physical phenomena.
机译：拓扑阶段可以沿着材料的边缘进行受保护的运输，从而可以抵抗无序和不完美的散射。这些阶段已在电子系统，电磁波（1-5），冷原子（6,7），声学（8）甚至力学（9）中得到证明，其潜在应用包括自旋电子学，量子计算和高效激光器（ 10-12）。通常，描述拓扑绝缘体的模型是二维或三维的空间格。但是，在具有一个空间维和一个合成维（对应于超冷原子（13-15）的自旋模）的晶格中也观察到了拓扑边缘状态，并且原子模已被用作合成维来证明晶格模型以及空间格实验无法获得的物理现象（13,16,17）。在光子学中，已经提出了具有合成尺寸的拓扑晶格用于研究高尺寸和相互作用的光子的物理现象（18-22），但到目前为止，还没有观察到合成尺寸的光子拓扑绝缘体。在这里，我们以合成尺寸实验证明了光子拓扑绝缘体。我们制造了一个光子晶格，其中光子在具有一个空间维和一个合成模态维的空间中受到有效磁场的作用。我们的方案支持该空间模态格子中的拓扑边缘状态，从而导致在二维实空间格子的大部分上扩展的鲁棒拓扑状态。我们的系统可用于增加光子晶格的维数，并通过设计诱导长距离耦合，从而形成可用于研究未探索的物理现象的晶格模型。

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  • 来源
    《Nature》 |2019年第7748期|356-360|共5页
  • 作者

    Lustig Eran; Weimann Steffen; Plotnik Yonatan; Lumer Yaakov; Bandres Miguel A.; Szameit Alexander; Segev Mordechai;

  • 作者单位

    Technion Israel Inst Technol, Phys Dept, Haifa, Israel|Technion Israel Inst Technol, Solid State Inst, Haifa, Israel;

    Univ Rostock, Inst Phys, Rostock, Germany;

    Technion Israel Inst Technol, Phys Dept, Haifa, Israel|Technion Israel Inst Technol, Solid State Inst, Haifa, Israel;

    Univ Penn, Dept Elect & Syst Engn, Philadelphia, PA 19104 USA;

    Technion Israel Inst Technol, Phys Dept, Haifa, Israel|Technion Israel Inst Technol, Solid State Inst, Haifa, Israel;

    Univ Rostock, Inst Phys, Rostock, Germany;

    Technion Israel Inst Technol, Phys Dept, Haifa, Israel|Technion Israel Inst Technol, Solid State Inst, Haifa, Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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