Nature Communications 6: Article number: 894810.1038/ncomms9948 (2015); Published: November132015; Updated: June062015.
This Article contains an error in the penultimate sentence of the penultimate paragraph. This sentence should read: ‘In other words, if one would analyse the minimum current level Imin using a simple parabolic κ(E) WKB approximation, one would extract a much smaller bandgap since Imin is severely underestimated.'
