Phys. Rev. Lett. 93, 176807 (2004) [4 pages]Fermi-Edge Singularities in the Mesoscopic X-Ray Edge ProblemReceived 31 January 2004; published 22 October 2004 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 Fermi-edge singularities—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; in particular, 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.176807
DOI:
10.1103/PhysRevLett.93.176807
PACS:
73.21.–b, 05.45.Mt, 78.67.–n, 78.70.Dm
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