Phys. Rev. B 66, 193105 (2002) [3 pages]Screening in the exchange term of the electron-hole interaction of the Bethe-Salpeter equationReceived 2 July 2002; published 27 November 2002 The Bethe-Salpeter equation (BSE), governing the dynamics of a particle-hole pair in a many-body system, is considered for the case in which the two-particle propagator is constructed from a finite set of particle-hole states. It is shown that in this case, it may be appropriate to screen the exchange kernel of the BSE with a background dielectric function εBG. An application to the computation of optical excitation spectra in quantum dots is discussed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.193105
DOI:
10.1103/PhysRevB.66.193105
PACS:
71.15.Qe, 78.67.Hc, 71.10.-w, 71.35.-y
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