摘要:Scientific Reports 3 , Article number: 1876 10.1038/srep01876 ( 2013 ); Published: 23 May 2013 ; Updated: 20 December 2013 This Article contains a typographical error in the Introduction section. “1 × 10 14 carriers/cm 2 ” was incorrectly given as “11014 carriers/cm 2 ” and “1 × 1014 carriers/cm 2 ” in the HTML and PDF versions of this Article respectively.