Recent progress on integrating two-dimensional materials with ferroelectrics for memory devices and photodetectors<xref rid="cpb_26_3

Recent progress on integrating two-dimensional materials with ferroelectrics for memory devices and photodetectors*

Wang Jianlu^†, Hu Weida^‡

(color online) (a) Schematic atomic structure of graphene. (b) Graphene band structure. Enlargement of the band structure close to the K and K′, points showing the Dirac cones.^[20] (c) Schematic atomic three-dimensional (3D) structure of . (d) Simplified band structure of bulk , showing the lowest conduction band c1 and the highest split valence bands v1 and v2. A and B are the direct-gap transitions, and I is the indirect-gap transition. is the indirect gap for the bulk, and is the direct gap for the monolayer.^[24]