空微腔中的倾斜平带
Tilting flat bands in an empty microcavity
摘要：
最近，各向异性材料的微腔被证明能够产生具有非零局部Berry曲率的新带。腔层的各向异性折射率被认为是在倾斜狄拉克点处打开能隙的关键。在这项工作中，我们表明，一个腔模式和布拉格模式之间的反交叉也可以在一个空的微腔内形成没有任何双折射材料。由于样品的折射率分布特殊，在能隙内观察到平坦带。本征TE-TM分裂和XY分裂导致动量空间中腔模的压缩，从而使平带发生与自旋相关的倾斜。我们的结果为研究光子在没有各向异性腔层的简单微腔中的自旋轨道耦合铺平了道路。
英文摘要：
Recently microcavities with anisotropic materials are shown to be able to create novel bands with non-zero local Berry curvature. The anisotropic refractive index of the cavity layer is believed to be critical in opening an energy gap at the tilted Dirac points. In this work, we show that an anticrossing between a cavity mode and a Bragg mode can also form within an empty microcavity without any birefringent materials. Flat bands are observed within the energy gap due to the particular refractive index distribution of the sample. The intrinsic TE-TM splitting and XY splitting induce the squeezing of the cavity modes in momentum space, so that the flat bands are spin-dependently tilted. Our results pave the way to investigate the spin orbit coupling of photons in a simple microcavity without anisotropic cavity layers.
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