“Intrinsic” Acceptor Ground State Splitting in Silicon: An Isotopic Effect

D. Karaiskaj, M. L. W. Thewalt, T. Ruf, M. Cardona, and M. Konuma
Phys. Rev. Lett. 89, 016401 – Published 12 June 2002
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Abstract

One of the oldest open questions in semiconductor physics is the origin of the small splittings of the neutral acceptor ground state in silicon which lead to a distribution of doublet splittings rather than the fourfold-degenerate state of Γ8 symmetry expected in the absence of perturbations. Here we show that these acceptor ground state splittings are absent in the photoluminescence spectra of acceptor bound excitons in isotopically purified 28Si, demonstrating conclusively the surprising result that the splittings previously observed in natural Si result from the randomness of the Si isotopic composition.

  • Received 13 March 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.016401

©2002 American Physical Society

Authors & Affiliations

D. Karaiskaj and M. L. W. Thewalt

  • Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6

T. Ruf, M. Cardona, and M. Konuma

  • Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany

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Vol. 89, Iss. 1 — 1 July 2002

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