Femtosecond Photoemission Electron Microscopy of Indium Arsenide Nanowires

Sammanfattning: PhotoEmission Electron Microscopy (PEEM) has proven to be a successful method for examining the electronic characteristics of nanostructures. The experiments relevant for the following report were conducted using a combination of PEEM and a femtosecond pulsed laser to determine the electrical characteristics of Indium Arsenide nanowire of crystal structure varying between wurtzite and zinc blend. Particular emphasis was put on analyzing the difference between electrical characteristics of the two crystal structures. Several experiments were conducted on these nanowires to investigate different properties. The photoemission of the different segments were examined using light of different polarization, which showed that the different atomic structures acted quite differently under different polarizations. A set of time-resolved pump probe experiments were conducted, which further indicated the same results as the polarization scans. That the wurtzite and zinc blende segments acted quite differently for different polarizations. The time-resolved experiments also provided knowledge about the electron relaxation times of the different crystal structure segments of the nanowires.