Approaching the intrinsic band gap in suspended high-mobility graphene nanoribbons

Ming-Wei Lin,1 Cheng Ling,1 Luis A. Agapito,2 Nicholas Kioussis,2 Yiyang Zhang,1,3 Mark Ming-Cheng Cheng,3 Wei L. Wang,4 Efthimios Kaxiras,4 and Zhixian Zhou1,* 1Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA 2Department of Physics, California State University, Northridge, California 91330, USA 3Department of Electrical and Computer Engineering, Wayne State University, Detroit, Michigan 48202, USA 4Department of Physics and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA (Received 26 May 2011; revised manuscript received 31 July 2011; published 6 September 2011)