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Semiconductor-to-Metal Transition and Quasiparticle Renormalization in Doped Graphene Nanoribbons
Univ Cologne, Phys Inst 2, Zulpicher Str 77, D-50937 Cologne, Germany..
Univ Cologne, Phys Inst 2, Zulpicher Str 77, D-50937 Cologne, Germany.;St Petersburg State Univ, Ulyanovskaya Ul 1, St Petersburg 198504, Russia.;IFW Dresden, Helmholtzstr 20, D-01069 Dresden, Germany..
Univ Calif Berkeley, 699 Tan Hall, Berkeley, CA 94720 USA..
Inst Res Fundamental Sci IPM, Sch Nano Sci, POB 19395-5531, Tehran, Iran..
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2017 (English)In: ADVANCED ELECTRONIC MATERIALS, ISSN 2199-160X, Vol. 3, no 4, 1600490Article in journal (Refereed) Published
Abstract [en]

A semiconductor-to-metal transition in N = 7 armchair graphene nanoribbons causes drastic changes in its electron and phonon system. By using angle-resolved photoemission spectroscopy of lithium-doped graphene nanoribbons, a quasiparticle band gap renormalization from 2.4 to 2.1 eV is observed. Reaching high doping levels (0.05 electrons per atom), it is found that the effective mass of the conduction band carriers increases to a value equal to the free electron mass. This giant increase in the effective mass by doping is a means to enhance the density of states at the Fermi level which can have palpable impact on the transport and optical properties. Electron doping also reduces the Raman intensity by one order of magnitude, and results in relatively small (4 cm(-1)) hardening of the G phonon and softening of the D phonon. This suggests the importance of both lattice expansion and dynamic effects. The present work highlights that doping of a semiconducting 1D system is strikingly different from its 2D or 3D counterparts and introduces doped graphene nanoribbons as a new tunable quantum material with high potential for basic research and applications.

Place, publisher, year, edition, pages
WILEY , 2017. Vol. 3, no 4, 1600490
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-322215DOI: 10.1002/aelm.201600490ISI: 000399448600005OAI: oai:DiVA.org:uu-322215DiVA: diva2:1096405
Funder
EU, European Research Council, 648589 321319German Research Foundation (DFG), CRC1238 A1 GR 3708/2-1Swedish Research Council
Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-22Bibliographically approved

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Simonov, Konstantin A.Mårtensson, Niels

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