%0 Journal Article
%T Local electric field screening in bi-layer graphene devices
%A Vishal Panchal
%A Cristina E. Giusca
%A Arseniy Lartsev
%A Rositza Yakimova
%A Olga Kazakova
%J Frontiers in Physics
%D 2014
%I Frontiers Media
%R 10.3389/fphy.2014.00003
%X We present experimental studies of both local and macroscopic electrical effects in uniform single- (1LG) and bi-layer graphene (2LG) devices as well as in devices with non-uniform graphene coverage, under ambient conditions. DC transport measurements on sub-micron scale Hall bar devices were used to show a linear rise in carrier density with increasing 2LG coverage. Electrical scanning gate microscopy was used to locally top gate uniform and non-uniform devices in order to observe the effect of local electrical gating. We experimentally show a significant level of electric field screening by 2LG. We demonstrate that SGM technique is an extremely useful research tool for studies of local screening effects, which provides a complementary view on phenomena that are usually considered only within a macroscopic experimental scheme.
%K epitaxial graphene
%K scanning gate microscopy
%K single-layer graphene
%K double-layer graphene
%K electrical gating
%U http://www.frontiersin.org/Journal/10.3389/fphy.2014.00003/abstract