论文标题
在具有不均匀有效质量的二维Dirac锥系统中手性Landau水平的实验性实现
Experimental realization of chiral Landau levels in two-dimensional Dirac cone systems with inhomogeneous effective mass
论文作者
论文摘要
手性零体兰道水平是拓扑保护的散装状态，引起手性异常。先前关于此类手性Landau水平的讨论基于三维Weyl脱合。以前从未报道过使用二维Dirac Point Systems对未来应用更有希望的实现。在这里，我们提出了一种理论和实验方案，用于实现光子系统中的手性Landau水平。通过打破局部平价反演对称性，通过实验观察到具有单向传播特征的零阶级手性Landau水平，通过打破局部平价反转对称性引入不均匀的有效质量。另外，通过实验测试了手性零模式抵抗系统缺陷的可靠运输。我们的系统为实现二维Dirac系统中手性Landau水平的新途径提供了新的途径，并有可能在使用运输鲁棒性的设备设计中应用。
Chiral zeroth Landau levels are topologically protected bulk states that give rise to chiral anomaly. Previous discussions on such chiral Landau levels are based on three-dimensional Weyl degeneracies. Their realizations using two-dimensional Dirac point systems, being more promising for future applications, were never reported before. Here we propose a theoretical and experimental scheme for realizing chiral Landau levels in a photonic system. By introducing an inhomogeneous effective mass through breaking local parity inversion symmetries, the zeroth-order chiral Landau levels with one-way propagation characteristics are experimentally observed. In addition, the robust transport of the chiral zeroth mode against defects in the system is experimentally tested. Our system provides a new pathway for the realization of chiral Landau levels in two-dimensional Dirac systems, and may potentially be applied in device designs utilizing the transport robustness.
