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  Population inversion in monolayer and bilayer graphene

Gierz, I., Mitrano, M., Petersen, J. C., Cacho, C., Turcu, I. C. E., Springate, E., et al. (2015). Population inversion in monolayer and bilayer graphene. Journal of Physics: Condensed Matter, 27(16): 164204. doi:10.1088/0953-8984/27/16/164204.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-B0D5-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0BD8-0
Genre: Journal Article

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1409.0211v1.pdf (Preprint), 3MB
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2014
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© I. Gierz et al.

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http://arxiv.org/abs/1409.0211 (Preprint)
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 Creators:
Gierz, Isabella1, Author              
Mitrano, Matteo2, Author              
Petersen, Jesse C.3, Author
Cacho, Cephise4, Author
Turcu, I. C. Edmond4, Author
Springate, Emma4, Author
Stöhr, Alexander5, Author
Köhler, Axel5, Author
Starke, Ulrich5, Author
Cavalleri, Andrea2, 3, Author              
Affiliations:
1Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938295              
2Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
3Department of Physics, Clarendon Laboratory, University of Oxford, Wellington Square, Oxford OX1 2JD, UK , ou_persistent22              
4Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell, UK , ou_persistent22              
5Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany , ou_persistent22              

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Free keywords: Condensed matter: electrical, magnetic and optical; Surfaces, interfaces and thin films; PACS numbers: 78.66.Tr Fullerenes and related materials; 79.60.Bm Clean metal, semiconductor, and insulator surfaces; 71.20.Tx Fullerenes and related materials; intercalation compounds; 78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
 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 the Dirac 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.

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Language(s): eng - English
 Dates: 2014-10-042014-08-312014-10-062015-04-022015-04-29
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: BibTex Citekey: 0953-8984-27-16-164204
DOI: 10.1088/0953-8984/27/16/164204
arXiv: 1409.0211
 Degree: -

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Title: Journal of Physics: Condensed Matter
  Abbreviation : J. Phys.: Condens. Matter
Source Genre: Journal
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Publ. Info: Bristol, UK : IOP Publishing
Pages: - Volume / Issue: 27 (16) Sequence Number: 164204 Start / End Page: - Identifier: ISSN: 0953-8984
CoNE: /journals/resource/954928562478