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Phys. Rev. Lett. 87, 235501 (2001) [4 pages]

Thermal Double Donors and Quantum Dots

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J. Coutinho and R. Jones
School of Physics, University of Exeter, Exeter EX4 4QL, United Kingdom

L. I. Murin
Institute of Solid Sate and Semiconductor Physics, Minsk 220072, Belarus

V. P. Markevich
Centre for Electronic Materials, UMIST, Sackville Street, Manchester M601QD, United Kingdom

J. L. Lindström
Department of Physics, University of Lund, S-221 00 Lund, Sweden

S. Öberg
Department of Mathematics, Luleå University of Technology, Luleå S-97187, Sweden

P. R. Briddon
Department of Physics, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU, United Kingdom

Received 14 August 2001; published 14 November 2001

Combined local mode spectroscopy and ab initio modeling are used to demonstrate for the first time that oxygen atoms in thermal double donors (TDD) in Si are in close proximity. The observed vibrational modes in 16O, 18O, and mixed isotopic samples are consistent with a model involving [110] aligned oxygen chains made up of an insulating core lying between electrically active ends. The model also explains the minute spin density observed on oxygen in TDD+ as well as the piezospectroscopic tensors of the donors. The analogy between the thermal donors and quantum dots is emphasized.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.235501
DOI:
10.1103/PhysRevLett.87.235501
PACS:
61.72.Bb, 63.20.Pw, 81.05.Cy, 81.40.Tv
 
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