Stacking two-dimensional (2D) van der Waals materials with different interlayer atomic registry in a heterobilayer causes the formation of a long-range periodic superlattice that may bestow the heterostructure with properties such as new quantum fractal states or superconductivity. Recent optical measurements of transition metal dichalcogenide (TMD) heterobilayers have revealed the presence of hybridized interlayer electron-hole pair excitations at energies defined by the superlattice potential. The corresponding quasiparticle band structures, so-called minibands, have remained elusive, and no such features have been reported for heterobilayers composed of a TMD and another type of 2D material. We introduce a new x-ray capillary technology for performing microfocused angle-resolved photoemission spectroscopy with a spatial resolution of ~1 μm, and directly observe minibands at certain twist angles in mini Brillouin zones (mBZs). We discuss their origin in terms of initial and final state effects by analyzing their dispersion in distinct mBZs.

将具有不同层间原子配准的二维（2D）范德华材料堆叠在异质双层中会导致形成长周期周期性超晶格，该超晶格可能赋予异质结构以诸如新的量子分形态或超导性等性质。过渡金属二硫化氢（TMD）异质双分子层的最新光学测量结果表明，在超晶格势所定义的能量下，存在混合的层间电子-空穴对激发。相应的准粒子带结构（所谓的微带）仍然难以捉摸，对于由TMD和另一种2D材料组成的异质双分子层，尚无此类特征的报道。我们引入了一种新的X射线毛细管技术，用于执行空间分辨率约为1μm的微聚焦角分辨光发射光谱学，并直接在微型布里渊区（mBZs）中以一定的扭转角观察微型频带。通过分析它们在不同mBZ中的分散性，我们根据初始状态和最终状态的影响来讨论它们的起源。