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Title: Semiconductor-to-Metal Transition and Quasiparticle Renormalization in Doped Graphene Nanoribbons

Journal Article · · Advanced Electronic Materials
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [8];  [8];  [9];  [10];  [1];  [11];  [1];  [3];  [1];  [3];  [1]
  1. Univ. of Cologne (Germany). Inst. of Physics
  2. Univ. of Cologne (Germany). Inst. of Physics; Saint Petersburg State Univ. (Russian Federation); Leibniz Inst. for Solid State and Materials Research (IFW Dresden), Dresden (Germany)
  3. Univ. of California, Berkeley, CA (United States)
  4. Inst. for Research in Fundamental Sciences (IPM), Tehran (Iran). School of Nano Science
  5. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy; Lund Univ. (Sweden). MAX IV Lab.
  6. Lund Univ. (Sweden). MAX IV Lab.
  7. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy
  8. Forschungszentrum Julich (Germany). Peter Grünberg Inst. Inst. for Advanced Simulation
  9. Univ. of Cologne (Germany). Inst. for Theoretical Physics
  10. Univ. of Cologne (Germany). Inst. of Physics; Univ. of Vienna (Austria). Faculty of Physics; Moscow State Univ., Moscow (Russian Federation). Dept. of Materials Science
  11. Helmholtz Center for Materials and Energy, Berlin (Germany). Electron Storage Ring BESSY II

A semiconductor-to-metal transition in N = 7 armchair graphene nanoribbons causes drastic changes in its electron and phonon system. In this paper, 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. Finally, 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); European Research Council (ERC); German Research Foundation (DFG); Russian Science Foundation; Swedish Research Council (SRC)
Grant/Contract Number:
SC0010409; 0939514; 648589; 321319; CRC1238; GR 3708/2-1; 14-13-00747
OSTI ID:
1461116
Journal Information:
Advanced Electronic Materials, Vol. 3, Issue 4; ISSN 2199-160X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (12)

Ion Impact Induced Ultrafast Electron Dynamics in Finite Graphene‐Type Hubbard Clusters journal February 2019
Femtosecond Electron Dynamics in Graphene Nanoribbons – A Nonequilibrium Green Functions Approach Within an Extended Hubbard Model journal January 2019
Exciton and phonon dynamics in highly aligned 7-atom wide armchair graphene nanoribbons as seen by time-resolved spontaneous Raman scattering journal January 2018
Effect of lithium doping on the optical properties of monolayer MoS 2 journal March 2018
Finding the hidden valence band of N  =  7 armchair graphene nanoribbons with angle-resolved photoemission spectroscopy journal April 2018
Narrow photoluminescence and Raman peaks of epitaxial MoS 2 on graphene/Ir(1 1 1) journal November 2018
Reversible crystalline-to-amorphous phase transformation in monolayer MoS 2 under grazing ion irradiation journal January 2020
Superconducting nanoribbon with a constriction: A quantum-confined Josephson junction journal April 2018
Superconducting nanoribbon with a constriction: A quantum-confined Josephson junction text January 2018
Controlling a Chemical Coupling Reaction on a Surface: Tools and Strategies for On-Surface Synthesis journal March 2019
Field-Effect Transistors Based on Networks of Highly Aligned, Chemically Synthesized N = 7 Armchair Graphene Nanoribbons journal March 2018
Ion Impact Induced Ultrafast Electron Dynamics in Correlated Materials and Finite Graphene Clusters text January 2018

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