Journal Article

FZJ-2017-06003

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Semiconductor-to-Metal Transition and Quasiparticle Renormalization in Doped Graphene Nanoribbons2

Senkovskiy, B. V. (Corresponding author) ; Fedorov, A. V. ; Haberer, D. ; Farjam, M. ; Simonov, K. A. ; Preobrajenski, A. B. ; Mårtensson, N. ; Atodiresei, N.FZJ* ; Caciuc, V.FZJ* ; Blügel, S.FZJ* ; Rosch, A. ; Verbitskiy, N. I. ; Hell, M. ; Evtushinsky, D. V. ; German, R. ; Marangoni, T. ; van Loosdrecht, P. H. M. ; Fischer, F. R. (Corresponding author) ; Grüneis, A. (Corresponding author)

2017
Wiley Chichester

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Please use a persistent id in citations: http://hdl.handle.net/2128/22958  doi:10.1002/aelm.201600490

Abstract: 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.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)

Appears in the scientific report 2017

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

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