Journal Article

PUBDB-2016-03058

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Population Inversion in Monolayer and Bilayer Graphene

Gierz, I. (Corresponding author)CFEL*MPG* ; Mitrano, M.Extern* ; Petersen, J. C. ; Cacho, C. ; Edmond Turcu, I. C. ; Springate, E. ; Stöhr, A. ; Köhler, A. ; Starke, U. ; Cavalleri, A.CFEL*MPG*

2015
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0953-8984/27/16/164204

Abstract: The recent demonstration of saturable absorption and negative optical conductivity in the Terahertz range in graphene has opened up new opportunities for optoelectronic applications based on this and other low dimensional materials. Recently, population inversion across theDirac point has been observed directly by time- and angle-resolved photoemission spectroscopy (tr-ARPES), revealing a relaxation time of only ∼130 femtoseconds. This severely limits the applicability of single layer graphene to, for example, Terahertz light amplification. Here we use tr-ARPES to demonstrate long-lived population inversion in bilayer graphene. The effect is attributed to the small band gap found in this compound. We propose a microscopic model for these observations and speculate that an enhancement of both the pump photon energy and the pump fluence may further increase this lifetime.

Note: (c) IOP Publishing Ltd. Post referee full text in progress.

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Contributing Institute(s):

1. Forschungsgruppe für strukturelle Dynamik (MPSD)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)
2. LASERLAB-EUROPE - The Integrated Initiative of European Laser Research Infrastructures III (284464) (284464)

Experiment(s):

1. No specific instrument

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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