Scientific Reports 5: Article number: 8697; published online: 03 March 2015; updated: 18 December 2015

This Article contains a typographical error in the Introduction section.

although the existence of a such a transition below the upper critical dimension is still under debate16,17.

should read:

although the existence of such a transition below the upper critical dimension is still under debate16,17.

In addition, there are errors in the following equations.

In Equation (14)

should read:

In Equation (15)

should read:

In Equation (16)

should read: