Near-Isotropic Local Attosecond Charge Transfer within the Anisotropic Puckered Layers of Black Phosphorus

• DOI: 10.1021/acs.jpclett.3c01977
• Publication Date: 2023-09-22T21:29:55Z
• Authors: Robert Haverkamp; Stefan Neppl; Alexander Föhlisch
• Keywords: Zigzag; Phosphorene

Black phosphorus possesses useful two-dimensional (2D) characteristics of van der Waals coupled materials but additionally features an in-plane anisotropic puckered layer structure that deviates from common 2D materials. Three distinct directions exist within the lattice black phosphorus: armchair and zigzag out-of-plane direction, with each 3p partial density states. This structural anisotropy is imprinted onto various collective long-range properties, while extent to which local electronic processes are governed by this directionality unclear. At P L1 edge, directional selectivity core-hole clock method was used probe charge transfer dynamics electrons excited into 3p-derived conduction band on attosecond time scale. Here we show surprisingly small electron times reflects similarly differences in unoccupied states caused underlying bonding angles layers.