Many-body effects in the mesoscopic x-ray edge problem
Abstract
Many-body phenomena, a key interest in the investigation of bulk solid state systems, are studied here in the context of the x-ray edge problem for mesoscopic systems. We investigate the many-body effects associated with the sudden perturbation following the x-ray excitation of a core electron into the conduction band. For small systems with dimensions at the nanoscale we find considerable deviations from the well-understood metallic case where Anderson orthogonality catastrophe and the Mahan-Nozieres-DeDominicis response cause characteristic deviations of the photoabsorption cross section from the naive expectation. Whereas the K-edge is typically rounded in metallic systems, we find a slightly peaked K-edge in generic mesoscopic systems with chaotic-coherent electron dynamics. Thus the behavior of the photoabsorption cross section at threshold depends on the system size and is different for the metallic and the mesoscopic case.
Keywords
Cite
@article{arxiv.0705.4447,
title = {Many-body effects in the mesoscopic x-ray edge problem},
author = {Martina Hentschel and Georg Roeder and Denis Ullmo},
journal= {arXiv preprint arXiv:0705.4447},
year = {2009}
}