We report the realization of a synthetic magnetic field for photons and polaritons in a honeycomb lattice of coupled semiconductor micropillars. A strong synthetic field is induced in both the s and p orbital bands by engineering a uniaxial hopping gradient in the lattice, giving rise to the formation of Landau levels at the Dirac points. We provide direct evidence of the sublattice symmetry breaking of the lowest-order Landau level wavefunction, a distinctive feature of synthetic magnetic fields. Our realization implements helical edge states in the gap between n = 0 and n = ±1 Landau levels, experimentally demonstrating a novel way of engineering propagating edge states in photonic lattices. In light of recent advances in the enhancement of polariton–polariton nonlinearities, the Landau levels reported here are promising for the study of the interplay between pseudomagnetism and interactions in a photonic system.

我们报告了在耦合半导体微柱的蜂窝晶格中实现光子和极化子的合成磁场。通过在晶格中设计单轴跳跃梯度，在s和p轨道带中感应出强合成场，从而在狄拉克点处形成朗道能级。我们提供了最低阶朗道能级波函数亚晶格对称性破缺的直接证据，这是合成磁场的一个显着特征。我们的实现在n  = 0 和n  = ±1 Landau 能级之间的间隙中实现了螺旋边缘态，实验证明了一种在光子晶格中工程传播边缘态的新方法。鉴于最近在增强极化子-极化子非线性方面取得的进展，这里报道的朗道能级对于研究光子系统中的赝磁性和相互作用之间的相互作用很有希望。