Volume 96, Number 6, December 2011
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 December 2011|
Voltage-driven quantum oscillations of conductance in graphene
Advanced Science Institute, The Institute of Physical and Chemical Research (RIKEN) Wako-shi, Saitama, 351-0198, Japan
2 A. Ya. Usikov Institute for Radiophysics and Electronics Ukrainian Academy of Sciences 61085 Kharkov, Ukraine
3 Department of Physics and Astronomy, Michigan State University - East Lansing, MI 48824, USA
4 Department of Physics, Center for Theoretical Physics, Applied Physics Program, Center for the Study of Complex Systems, University of Michigan - Ann Arbor, MI 48109, USA
Accepted: 11 November 2011
Locally-gated single-layer graphene sheets have unusual discrete energy states inside the potential barrier induced by a finite-width gate. These states are localized outside the Dirac cone of continuum states and are responsible for novel quantum transport phenomena. Specifically, the longitudinal (along the barrier) conductance exhibits oscillations as a function of barrier height and/or width, which are both controlled by a nearby gate. The origin of these oscillations can be traced back to singularities in the density of localized states. These graphene conductance-oscillations resemble the Shubnikov-de Haas (SdH) magneto-oscillations, however, here these are driven by an electric field instead of a magnetic field.
PACS: 73.63.-b – Electronic transport in nanoscale materials and structures / 72.80.Vp – Electronic transport in graphene / 73.20.-r – Electron states at surfaces and interfaces
© EPLA, 2011
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