Electronic Transport and Quantum Hall Effect in Bipolar Graphene<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>n</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>p</mml:mi></mml:math>Junctions

Barbaros Özyilmaz; Pablo Jarillo‐Herrero; Dmitri K. Efetov; Dmitry A. Abanin; Leonid Levitov; Philip Kim

doi:10.1103/physrevlett.99.166804

Abstract

We have developed a device fabrication process to pattern graphene into nanostructures of arbitrary shape and control their electronic properties using local electrostatic gates. Electronic transport measurements have been used to characterize locally gated bipolar graphene $p$-$n$-$p$ junctions. We observe a series of fractional quantum Hall conductance plateaus at high magnetic fields as the local charge density is varied in the $p$ and $n$ regions. These fractional plateaus, originating from chiral edge states equilibration at the $p$-$n$ interfaces, exhibit sensitivity to inter-edge backscattering which is found to be strong for some of the plateuas and much weaker for other plateaus. We use this effect to explore the role of backscattering and estimate disorder strength in our graphene devices.

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PhysicsComputer science

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Publication Info

Year: 2007
Type: article
Volume: 99
Issue: 16
Citations: 462
Access: Closed

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Electronic Transport and Quantum Hall Effect in Bipolar Graphene<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>n</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>p</mml:mi></mml:math>Junctions

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APA Style

                            
                                
                                    Barbaros Özyilmaz, 
                                
                                    Pablo Jarillo‐Herrero, 
                                
                                    Dmitri K. Efetov
                                
                                et al.
                            
                            (2007). 
                            Electronic Transport and Quantum Hall Effect in Bipolar Graphene<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>n</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>p</mml:mi></mml:math>Junctions. 
                            Physical Review Letters
                            , 99
                            (16)
                            .
                            https://doi.org/10.1103/physrevlett.99.166804
                        

Identifiers

DOI: 10.1103/physrevlett.99.166804
PMID: 17995279
arXiv: 0705.3044

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