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research article

Ultrafast Dynamics of Massive Dirac Fermions in Bilayer Graphene

Ulstrup, Soren
•
Johannsen, Jens Christian  
•
Cilento, Federico
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2014
Physical Review Letters

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.

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Type
research article
DOI
10.1103/PhysRevLett.112.257401
Web of Science ID

WOS:000338644200017

Author(s)
Ulstrup, Soren
•
Johannsen, Jens Christian  
•
Cilento, Federico
•
Miwa, Jill A.
•
Crepaldi, Alberto  
•
Zacchigna, Michele
•
Cacho, Cephise
•
Chapman, Richard
•
Springate, Emma
•
Mammadov, Samir
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Date Issued

2014

Publisher

American Physical Society

Published in
Physical Review Letters
Volume

112

Issue

25

Article Number

257401

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSE  
Available on Infoscience
August 29, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/106409
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