Phys. Rev. Lett. 56, 2882–2882 (1986)Moritz and Lagally respondReceived 30 April 1986; published in the issue dated 30 June 1986 © 1986 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.56.2882
DOI:
10.1103/PhysRevLett.56.2882
PACS:
61.14.Hg, 61.14.Dc, 64.70.-p, 68.35.Rh
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