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Phonon excitation and instabilities in biased graphene nanoconstrictions

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Authors:
  • Gunst, Tue ;
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    Department of Micro- and Nanotechnology, Technical University of Denmark
  • Lu, Jing Tao ;
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    Department of Micro- and Nanotechnology, Technical University of Denmark
  • Hedegård, Per ;
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    University of Copenhagen
  • Brandbyge, Mads
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    Orcid logo0000-0002-0126-9824
    Department of Micro- and Nanotechnology, Technical University of Denmark
DOI:
10.1103/PhysRevB.88.161401
Abstract:
We investigate how a high current density perturbs the phonons in a biased graphene nanoconstriction coupled to semi-infinite electrodes. The coupling to electrode phonons, electrode electrons under bias, Joule heating, and current-induced forces is evaluated using first principles density functional theory and nonequilibrium Green's function calculations. We observe a strongly nonlinear heating of the phonons with bias and breakdown of the harmonic approximation when the Fermi level is tuned close to a resonance in the electronic structure of the constriction. This behavior is traced back to the presence of negatively damped phonons driven by the current. The effects may limit the stability and capacity of graphene nanoconstrictions to carry high currents.
Type:
Journal article
Language:
English
Published in:
Physical Review B, 2013, Vol 88, Issue 16
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2013
Scientific Level:
Scientific
ID:
255223151

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