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Ultrafast dynamics of massive Dirac fermions in bilayer graphene

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Date
25/06/2014
Author
Ulstrup, S.
Johannsen, J.C.
Cilento, F.
Miwa, J.A.
Crepaldi, A.
Zacchigna, M.
Cacho, C.
Chapman, R.
Springate, E.
Mammadov, S.
Fromm, F.
Raidel, C.
Seyller, T.
Parmigiani, F.
Grioni, M.
King, P.D.C.
Hofmann, P.
Funder
EPSRC
The Royal Society
Grant ID
EP/I031014/1
UF120096
Keywords
QC Physics
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Abstract
Bilayer graphene is a highly promising material for electronic and optoelectronic applications since it is supporting massive Dirac fermions with a tunable band gap. However, no consistent picture of the gap's effect on the optical and transport behavior has emerged so far, and it has been proposed that the insulating nature of the gap could be compromised by unavoidable structural defects, by topological in-gap states, or that the electronic structure could be altogether changed by many-body effects. Here, we directly follow the excited carriers in bilayer graphene on a femtosecond time scale, using ultrafast time- and angle-resolved photoemission. We find a behavior consistent with a single-particle band gap. Compared to monolayer graphene, the existence of this band gap leads to an increased carrier lifetime in the minimum of the lowest conduction band. This is in sharp contrast to the second substate of the conduction band, in which the excited electrons decay through fast, phonon-assisted interband transitions.
Citation
Ulstrup , S , Johannsen , J C , Cilento , F , Miwa , J A , Crepaldi , A , Zacchigna , M , Cacho , C , Chapman , R , Springate , E , Mammadov , S , Fromm , F , Raidel , C , Seyller , T , Parmigiani , F , Grioni , M , King , P D C & Hofmann , P 2014 , ' Ultrafast dynamics of massive Dirac fermions in bilayer graphene ' , Physical Review Letters , vol. 112 , no. 25 , 257401 . https://doi.org/10.1103/PhysRevLett.112.257401
Publication
Physical Review Letters
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevLett.112.257401
ISSN
0031-9007
Type
Journal article
Rights
© 2014 American Physical Society
Description
The authors acknowledge financial support from the VILLUM foundation, The Danish Council for Independent Research/Technology and Production Sciences, the Lundbeck Foundation, the Swiss National Science Foundation (NSF), EPSRC, The Royal Society, and the Italian Ministry of University and Research (Grants No. FIRBRBAP045JF2 and No. FIRB-RBAP06AWK3).
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  • University of St Andrews Research
URL
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.257401#supplemental
URI
http://hdl.handle.net/10023/5434

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