dc.contributor.author | Howard, CA | |
dc.contributor.author | Dean, MPM | |
dc.contributor.author | Withers, F | |
dc.date.accessioned | 2016-10-24T11:14:20Z | |
dc.date.issued | 2011-12-19 | |
dc.description.abstract | Graphene phonons are measured as a function of electron doping via the addition of potassium adatoms. In the low doping regime, the in-plane carbon G-peak hardens and narrows with increasing doping, analogous to the trend seen in graphene doped via the field-effect. At high dopings, beyond those accessible by the field-effect, the G-peak strongly softens and broadens. This is interpreted as a dynamic, non-adiabatic renormalization of the phonon self-energy. At dopings between the light and heavily doped regimes, we find a robust inhomogeneous phase where the potassium coverage is segregated into regions of high and low density. The phonon energies, linewidths and tunability are remarkably similar for 1-4 layer graphene, but significantly different to doped bulk graphite. | en_GB |
dc.description.sponsorship | We thank the EPSRC for funding, Felix Fernandez-Alonso,
Andrew Walters, and Mark Ellerby for fruitful discussions, and
Steve Firth for technical assistance. The work at Brookhaven
is supported by the US DOE under Contract No. DEAC02-
98CH10886 and by the Center for Emergent Superconductivity,
an Energy Frontier Research Center funded by the US
DOE, Office of Basic Energy Sciences. | en_GB |
dc.identifier.citation | Vol. 84, 241404(R) | en_GB |
dc.identifier.doi | 10.1103/PhysRevB.84.241404 | |
dc.identifier.uri | http://hdl.handle.net/10871/24051 | |
dc.language.iso | en | en_GB |
dc.publisher | American Physical Society | en_GB |
dc.title | Phonons in potassium doped graphene: the effects of electron-phonon interactions, dimensionality and ad-atom ordering | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2016-10-24T11:14:20Z | |
dc.identifier.issn | 2469-9950 | |
pubs.declined | 2016-10-21T10:26:16.881+0100 | |
dc.description | This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record. | en_GB |
dc.identifier.journal | Physical Review B | en_GB |