Spatiotemporal Imaging of Thickness-Induced Band-Bending Junctions.

van der Waals materials exhibit naturally passivated surfaces and an ability to form versatile heterostructures to enable an examination of carrier transport mechanisms not seen in traditional materials. Here, we report a new type of homojunction termed a "band-bending junction" whose potential landscape depends solely on the difference in thickness between the two sides of the junction. Using MoS on Au as a prototypical example, we find that surface potential differences can arise from the degree of vertical band bending in thin and thick regions.

Synthesis, Magnetic Properties, and Electronic Structure of Magnetic Topological Insulator MnBiSe.

The intrinsic magnetic topological insulators MnBiTe and MnBiSe support novel topological states related to symmetry breaking by magnetic order. Unlike MnBiTe, the study of MnBiSe has been inhibited by the lack of bulk crystals, as the van der Waals (vdW) crystal is not the thermodynamic equilibrium phase. Here, we report the layer-by-layer synthesis of vdW MnBiSe crystals using nonequilibrium molecular beam epitaxy.