Disorder-Induced Enhancement of Transport through GrapheneJunctions
- 16 October 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 101 (16), 166806
- https://doi.org/10.1103/physrevlett.101.166806
Abstract
We investigate the electron transport through a graphene junction under a perpendicular magnetic field. By using the Landauer-Büttiker formalism combined with the nonequilibrium Green function method, the conductance is studied for clean and disordered samples. For the clean junction, the conductance is quite small. In the presence of disorders, it is strongly enhanced and exhibits a plateau structure at a suitable range of disorders. Our numerical results show that the lowest plateau can survive for a very broad range of disorder strength, but the existence of high plateaus depends on system parameters and sometimes cannot be formed at all. When the disorder is slightly outside of this disorder range, some conductance plateaus can still emerge with its value lower than the ideal value. These results are in excellent agreement with a recent experiment.
Keywords
This publication has 18 references indexed in Scilit:
- Quantum Hall Effect in a Gate-Controlled p-n Junction of GrapheneScience, 2007
- Valley-isospin dependence of the quantum Hall effect in a graphenejunctionPhysical Review B, 2007
- The Focusing of Electron Flow and a Veselago Lens in Graphene p-n JunctionsScience, 2007
- Quantum Dots in GraphenePhysical Review Letters, 2007
- Chiral tunnelling and the Klein paradox in grapheneNature Physics, 2006
- Selective transmission of Dirac electrons and ballistic magnetoresistance ofjunctions in graphenePhysical Review B, 2006
- Unconventional quantum Hall effect and Berry’s phase of 2π in bilayer grapheneNature Physics, 2006
- Two-dimensional gas of massless Dirac fermions in grapheneNature, 2005
- Experimental observation of the quantum Hall effect and Berry's phase in grapheneNature, 2005
- Electric Field Effect in Atomically Thin Carbon FilmsScience, 2004