Graphene Transport at High Carrier Densities using a Polymer Electrolyte Gate
| Autor: | Pachoud, Alexandre, Jaiswal, Manu, Ang, Priscilla Kailian, Loh, Kian Ping, Oezyilmaz, Barbaros |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | EPL (Europhysics Letters), 92, 27001, (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/92/27001 |
| Popis: | We report the study of graphene devices in Hall-bar geometry, gated with a polymer electrolyte. High densities of 6 $\times 10^{13}/cm^{2}$ are consistently reached, significantly higher than with conventional back-gating. The mobility follows an inverse dependence on density, which can be correlated to a dominant scattering from weak scatterers. Furthermore, our measurements show a Bloch-Gr\"uneisen regime until 100 K (at 6.2 $\times10^{13}/cm^{2}$), consistent with an increase of the density. Ubiquitous in our experiments is a small upturn in resistivity around 3 $\times10^{13}/cm^{2}$, whose origin is discussed. We identify two potential causes for the upturn: the renormalization of Fermi velocity and an electrochemically-enhanced scattering rate. Comment: 13 pages, 4 figures, Published Version |
| Databáze: | arXiv |
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