Journal Article black phosphorus 2D ferromagnetic materials 2D layered materials Research Support, Non-U.S. Gov't Te-doping bistability density functional theory field-effect transistors first-principle methods first-principles method machine learning material descriptors microabsorption spectra molecular dynamics simulations molecular ferroelectricity photocurrent piezoelectricity piezoresponse force microscopy imaging second-harmonic generation self-assembly surface functionalization van der Waals epitaxy