Experimental realization of chiral Landau levels in two-dimensional Dirac cone systems with inhomogeneous effective mass

Abstract

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.

References in corpus (9)

• Analogs of quantum Hall effect edge states in photonic crystals
• Planar chiral metasurfaces with maximal tunable chiroptical response driven by bound states in the continuum
• Topologically Robust Transport of Photons in a Synthetic Gauge Field
• Topological one-way large-area waveguide states in magnetic photonic crystals
• Review of experiments on the chiral anomaly in Dirac-Weyl semimetals
• Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices
• Two-dimensional Dirac Semimetals without Inversion Symmetry
• Synthetic non-Abelian gauge fields and gravitomagnetic effects in tilted Dirac cone systems
• Chiral transport of pseudo-spinors induced by synthetic gravitational field in photonic Weyl metamaterials