Edge-state transport in graphenep−njunctions in the quantum Hall regime
| Autor: | Son T. Le, Ji Ung Lee, Nikolai N. Klimov, Everett Comfort, Jun Yan, Curt A. Richter, David B. Newell, Pratik Agnihotri |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Physical Review B. 92 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.92.241301 |
| Popis: | We experimentally investigate charge carrier transport in a graphene $p\ensuremath{-}n$ junction device by using independent $p$-type and $n$-type electrostatic gating which allow full characterization of the junction interface in the quantum Hall regime covering a wide range of filling factors $[\ensuremath{-}10\ensuremath{\le}({\ensuremath{\nu}}_{1},\phantom{\rule{0.16em}{0ex}}{\ensuremath{\nu}}_{2})\ensuremath{\le}10]$. Recent charge transport measurements across a graphene $p\ensuremath{-}n$ junction in this quantized regime presume that equilibration of all of the Landauer-B\"uttiker edge states occurs across the $p\ensuremath{-}n$ junction interface. Here we show that, in our devices, only the edge state associated with the lowest Landau level fully equilibrate across the $p\ensuremath{-}n$ junction, while none of the other edge states equilibrate to transmit current across the junction. |
| Databáze: | OpenAIRE |
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