Thermally Driven Crossover from Indirect toward Direct Bandgap in 2D Semiconductors: MoSe2 versus MoS2 Tongay, Sefaattin ; Zhou, Jian ; Ataca, Can ; Lo, Kelvin ; Matthews, Tyler S. ; Li, Jingbo ; Grossman, Jeffrey C. ; Wu, Junqiao Abstract Publication: Nano Letters Pub Date: November 2012 DOI: 10.1021/nl302584w Bibcode: 2012NanoL..12.5576T