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We report detailed results on ionization in metallic quantum--dot (QD)nanorings described by the extended Hubbard model at half filling obtained byexact numerical diagonalization. In spite of very strong electron correlations,the ionization spectra are astonishingly scarce. We attribute this scarcity toa hidden quasi--symmetry, generalizing thereby similar results on opticalabsorption recently reported [I. Baldea and L. S. Cederbaum, \prb {\bf 75},125323 (2007); {\bf 77}, 165339 (2008)]. Numerical results indicate that thishidden quasi--symmetry of the extended Hubbard model does not evolve into atrue (hidden) symmetry but remains a quasi--symmetry in the case of therestricted Hubbard model as well. Based on the observation on the number ofsignificant ionization signals per each spatial symmetry, we claim theexistence of a one--to--one map between the relevant ionization signals of thecorrelated half-filled nanorings and the one-hole and two-hole--one-particleprocesses possible in the noninteracting case. Similar to the case of opticalabsorption, numerous avoided crossings (anticrossings) are present in theionization spectra, which often involve more than two states. The presentresults demonstrate that ionization could be a useful tool to study electroncorrelations in metallic QD--nanoarrays, providing information that iscomplementary to optical absorption.

Intriguing electron correlation effects in the photoionization of metallic quantum--dot nanorings