Many-body effects in the mesoscopic x-ray edge problem

Details Many-body effects in the mesoscopic x-ray edge problem Many-body effects in the mesoscopic x-ray edge problem

2007-05-30

arxiv.org/abs/0705.4447v1

Prog. Theor. Phys. Suppl. 166 (2007), 143-151

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 3 figures, Proceedings ``Quantum Mechanics and Chaos'' (Osaka 2006)

Scientific paper

10.1143/PTPS.166.143

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.

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