Coexistence of classical snake states and Aharonov-Bohm oscillations along graphene p-n junctions

Péter Makk, Clevin Handschin, Endre Tóvári, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Ming Hao Liu, Christian Schönenberger

研究成果: Article同行評審

19 引文 斯高帕斯(Scopus)

摘要

Here we present measurements on p-n junctions in encapsulated graphene revealing several sets of magnetoconductance oscillations originating from quasiclassical snake states and edge state Aharonov-Bohm interferences. Even though some of these oscillations have already been observed in suspended and encapsulated devices including different geometries, their identification remained challenging as they were observed in separate measurements, and only a limited amount of data was available. Moreover, these effects have similar experimental signatures, therefore for their proper assignment their simultaneous observation and their detailed characterization is needed. The investigation of the charge carrier density, magnetic field, temperature, and bias dependence of the oscillations enabled us to properly identify their origin. Surprisingly we have found that snake states and Aharonov-Bohm interferences can coexist within a limited parameter range. We explain this using a unified picture of magneto-oscillations and confirm our findings using tight binding simulations. Since p-n junctions are the most important building blocks of graphene based electron-optical elements and edge state interferometers, our findings will be crucial for the design and understanding of future devices.

原文English
文章編號035413
期刊Physical Review B
98
發行號3
DOIs
出版狀態Published - 2018 7月 9

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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