Giant Valley-Isospin Conductance Oscillations in Ballistic Graphene

Handschin, Clevin and Makk, Péter and Rickhaus, Peter and Maurand, Romain and Watanabe, Kenji and Taniguchi, Takashi and Richter, Klaus and Liu, Ming-Hao and Schönenberger, Christian . (2017) Giant Valley-Isospin Conductance Oscillations in Ballistic Graphene. Nano Letters, 17 (9). pp. 5389-5393.

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Official URL: http://edoc.unibas.ch/58122/

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At high magnetic fields the conductance of graphene is governed by the half-integer quantum Hall effect. By local electrostatic gating a p–n junction perpendicular to the graphene edges can be formed, along which quantum Hall channels copropagate. It has been predicted by Tworzidło and co-workers that if only the lowest Landau level is filled on both sides of the junction, the conductance is determined by the valley (isospin) polarization at the edges and by the width of the flake. This effect remained hidden so far due to scattering between the channels copropagating along the p–n interface (equilibration). Here we investigate p–n junctions in encapsulated graphene with a movable p–n interface with which we are able to probe the edge-configuration of graphene flakes. We observe large quantum conductance oscillations on the order of e2/h which solely depend on the p–n junction position providing the first signature of isospin-defined conductance. Our experiments are underlined by quantum transport calculations.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Handschin, Clevin and Makk, Peter and Rickhaus, Peter and Maurand, Romain
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:28 Dec 2017 08:59
Deposited On:28 Dec 2017 08:58

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