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Growth of ultrahigh-density quantum-confined germanium dots on thin films
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24.To make proper measurements and to extract reliable values of energy gap one should stay in a density of state regime and one should select a suitable distance and therefore a proper balance between voltage and current. This can be done quite easily by inspecting the curve that should not resemble that of a Schottky junction because in this case the flowing of the current masks the genuine density of states. For more details see, e.g., Scanning Tunneling Microscopy, Methods of Experimental Physics, Vol. 27, edited by J. A. Stroscio and W. J. Kaiser (Academic, San Diego, 1993).
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See EPAPS Document No. for the top panel of Fig. SM1. It shows a STM image
clean surface obtained after a rapid thermal annealing at 950 °C; the lower panel exhibits a typical line profile of the STM image shown in the top panel. This document can be reached via a direct link in the online article’s HTML reference section or via the EPAPS homepage (http://www.aip.org/pubservs/epaps.html
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