Fermi-Edge Singularities in the Mesoscopic X-Ray Edge Problem

Details Fermi-Edge Singularities in the Mesoscopic X-Ray Edge Problem Fermi-Edge Singularities in the Mesoscopic X-Ray Edge Problem

2004-02-06

arxiv.org/abs/cond-mat/0402207v2

Phys. Rev. Lett. 93, 176807 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, final version as published in PRL

Scientific paper

10.1103/PhysRevLett.93.176807

We study the x-ray edge problem for a chaotic quantum dot or nanoparticle displaying mesoscopic fluctuations. In the bulk, x-ray physics is known to produce deviations from the naively expected photoabsorption cross section in the form of a peaked or rounded edge. For a coherent system with chaotic dynamics, we find substantial changes and in particular that a photoabsorption cross section showing a rounded edge in the bulk will change to a slightly peaked edge on average as the system size is reduced to a mesoscopic (coherent) scale.

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