High-harmonic generation by quantum-dot nanorings

Ioan Bâldea, Ashish K. Gupta, Lorenz S. Cederbaum, and Nimrod Moiseyev
Phys. Rev. B 69, 245311 – Published 18 June 2004

Abstract

Exact numerical results are obtained within the extended Hubbard Hamiltonian for nanorings consisting of Ag quantum dots (QD’s) with C6v symmetry which interact with a circularly polarized light. The results show that the high-harmonic generation (HHG) spectra obtained from such artificial “molecules” are more pronounced than the HHG spectra obtained from a real molecule such as benzene. Our studies show that the HHG spectra obtained from the QD nanorings consist of two plateaus while only one plateau appears for benzene. The role of electron correlations in the generation of the high-order harmonics is studied, and it is shown that it can increase the intensity of the high-order harmonics. Mainly affected are the harmonics which are located in the second plateau. Selection rules for the produced high harmonics and a new “synergetic” selection rule for the symmetry of the states contributing to the HHG spectrum, a combined effect of spatial and charge conjugation symmetries, are discussed.

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  • Received 30 January 2004

DOI:https://doi.org/10.1103/PhysRevB.69.245311

©2004 American Physical Society

Authors & Affiliations

Ioan Bâldea1,*, Ashish K. Gupta2,†, Lorenz S. Cederbaum1, and Nimrod Moiseyev2

  • 1Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
  • 2Department of Chemistry and Minerva Center of Nonlinear Physics in Complex Systems Technion-Israel Institute of Technology, Haifa 32000, Israel

  • *Electronic address: ioan@pci.uni-heidelberg.de; Permanent address: National Institute for Lasers, Plasmas, and Radiation Physics, ISS, RO-76900 Bucharest-Măgurele, Romania.
  • Electronic address: akg_1973@yahoo.com; Permanent address: Chemistry Group, Birla Institute of Technology and Science, Pilani-333031, Rajasthan, India.

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Vol. 69, Iss. 24 — 15 June 2004

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