The DOI matches its Crossref record; 19 of the 19 references it cites were found in a registry or an index.
Evidence of the role of contacts on the observed electron-hole asymmetry in graphene
Open accessAbstract
We perform electrical transport measurements in graphene with several sample geometries. In particular, we design ``invasive'' probes crossing the whole graphene sheet as well as ``external'' probes connected through graphene side arms. The four-probe conductance measured between external probes varies linearly with charge density and is symmetric between electron and hole types of carriers. In contrast measurements with invasive probes give a strong electron-hole asymmetry and a sublinear conductance as a function of density. By comparing various geometries and types of contact metal, we show that these two observations are due to transport properties of the metal/graphene interface. The asymmetry originates from the pinning of the charge density below the metal, which thereby forms a $p\text{\ensuremath{-}}n$ or $p\text{\ensuremath{-}}p$ junction, depending on the polarity of the carriers in the bulk graphene sheet. Our results also explain part of the sublinearity observed in conductance as a function of density in a large number of experiments on graphene, which has generally been attributed to short-range scattering only.
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Cites
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Koppens, F. H. L., Mueller, T., Avouris, P., Ferrari, A. C., Vitiello, M. S., & Polini, M. (2014) · Nature Nanotechnology · doi:10.1038/nnano.2014.215 · Cited by 3,828
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The origins and limits of metal–graphene junction resistance
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Contact and edge effects in graphene devices
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Sensitive room-temperature terahertz detection via the photothermoelectric effect in graphene
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Metadata
- Authors
- Huard, B., Stander, N., Sulpizio, J. A., & Goldhaber-Gordon, D.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2008-09-04
- Volume
- 78
- Issue
- 12
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W1993323886
- Cited by
- 422
- References
- 19
- FWCI
- 24.42
- Type
- journal article
- Language
- en
- Open access
- green
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