By S. Rips and M. J. Hartmann is published in Phys. Rev. Lett.110, 120503 (2013).
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By S. Rips, M. Kiffner, I. Wilson-Rae and M.J. Hartmann, New J. Phys. 14, 023042 (2012) has been selected for inclusion in the 'Highlights of 2012' collection of New Journal of Physics.