Fig. 4: Ga K-edge XANES in the p and n-type segment.

a Edge region of the X-ray absorption near-edge spectroscopy (XANES) spectra measured around the Ga K-edge at the p-doped (blue) and the n-doped (orange) part of the GaAs nanowire at 0 V (light colors) and −5 V (dark colors), respectively. References for GaAs and Ga in octahedral coordination (Ga(AcAc)₃ are added as dashed and dotted lines^31,32. A clear shift in the absorption edge can be observed in the n-doped region for the measurement at −5 V. b Ga K-edge XANES spectra measured after all high-resolution XBIC/XRF maps in the p and the n-type segment (black hollow circles and squares) displayed together with the edge region spectra for −5 V and reference data^31,32. The dashed, vertical lines indicate the Ga K-edge energies from the p- and n-type segment, respectively.