Towards superlattices: Lateral bipolar multibarriers in graphene

Martin Drienovsky, Franz Xaver Schrettenbrunner, Andreas Sandner, Dieter Weiss, Jonathan Eroms, Ming Hao Liu, Fedor Tkatschenko, Klaus Richter

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We report on transport properties of monolayer graphene with a laterally modulated potential profile, employing striped top gate electrodes with spacings of 100 to 200 nm. Tuning of top and back gate voltages gives rise to local charge carrier density disparities, enabling the investigation of transport properties either in the unipolar (nn′) or the bipolar (np′) regime. In the latter, pronounced single- and multibarrier Fabry-Pérot (FP) resonances occur. We present measurements of different devices with different numbers of top gate stripes and spacings. The data are highly consistent with a phase coherent ballistic tight-binding calculation and quantum capacitance model, whereas a superlattice effect and modification of band structure can be excluded.

Original languageEnglish
Article number115421
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number11
DOIs
Publication statusPublished - 2014 Mar 17

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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