Physics – Condensed Matter – Materials Science
Scientific paper
2011-02-13
Nature Materials 10, 282--285 (2011)
Physics
Condensed Matter
Materials Science
Nature Materials advance online publication 13/02/2011
Scientific paper
10.1038/nmat2968
Graphene has demonstrated great promise for future electronics technology as well as fundamental physics applications because of its linear energy-momentum dispersion relations which cross at the Dirac point. However, accessing the physics of the low density region at the Dirac point has been difficult because of the presence of disorder which leaves the graphene with local microscopic electron and hole puddles, resulting in a finite density of carriers even at the charge neutrality point. Efforts have been made to reduce the disorder by suspending graphene, leading to fabrication challenges and delicate devices which make local spectroscopic measurements difficult. Recently, it has been shown that placing graphene on hexagonal boron nitride (hBN) yields improved device performance. In this letter, we use scanning tunneling microscopy to show that graphene conforms to hBN, as evidenced by the presence of Moire patterns in the topographic images. However, contrary to recent predictions, this conformation does not lead to a sizable band gap due to the misalignment of the lattices. Moreover, local spectroscopy measurements demonstrate that the electron-hole charge fluctuations are reduced by two orders of magnitude as compared to those on silicon oxide. This leads to charge fluctuations which are as small as in suspended graphene, opening up Dirac point physics to more diverse experiments than are possible on freestanding devices.
Bulmash D.
Deshpande Akshay
Jacquod Philippe
Jarillo-Herrero Pablo
LeRoy Brian J.
No associations
LandOfFree
STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-213591