Current-induced runaway vibrations in dehydrogenated graphene nanoribbons
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Current-induced runaway vibrations in dehydrogenated graphene nanoribbons. / Christensen, Rasmus Bjerregaard; Lü, Jing Tao; Hedegård, Per; Brandbyge, Mads.
In: Beilstein Journal of Nanotechnology, Vol. 7, No. 1, 2016, p. 68-74.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - Current-induced runaway vibrations in dehydrogenated graphene nanoribbons
AU - Christensen, Rasmus Bjerregaard
AU - Lü, Jing Tao
AU - Hedegård, Per
AU - Brandbyge, Mads
PY - 2016
Y1 - 2016
N2 - We employ a semi-classical Langevin approach to study current-induced atomic dynamics in a partially dehydrogenated armchair graphene nanoribbon. All parameters are obtained from density functional theory. The dehydrogenated carbon dimers behave as effective impurities, whose motion decouples from the rest of carbon atoms. The electrical current can couple the dimer motion in a coherent fashion. The coupling, which is mediated by nonconservative and pseudo-magnetic current-induced forces, change the atomic dynamics, and thereby show their signature in this simple system. We study the atomic dynamics and current-induced vibrational instabilities using a simplified eigen-mode analysis. Our study illustrates how armchair nanoribbons can serve as a possible testbed for probing the current-induced forces.
AB - We employ a semi-classical Langevin approach to study current-induced atomic dynamics in a partially dehydrogenated armchair graphene nanoribbon. All parameters are obtained from density functional theory. The dehydrogenated carbon dimers behave as effective impurities, whose motion decouples from the rest of carbon atoms. The electrical current can couple the dimer motion in a coherent fashion. The coupling, which is mediated by nonconservative and pseudo-magnetic current-induced forces, change the atomic dynamics, and thereby show their signature in this simple system. We study the atomic dynamics and current-induced vibrational instabilities using a simplified eigen-mode analysis. Our study illustrates how armchair nanoribbons can serve as a possible testbed for probing the current-induced forces.
KW - Current-induced forces
KW - Density functional theory (NEGF-DFT)
KW - Graphene
KW - Molecular electronics
U2 - 10.3762/bjnano.7.8
DO - 10.3762/bjnano.7.8
M3 - Letter
C2 - 26925354
AN - SCOPUS:84994037280
VL - 7
SP - 68
EP - 74
JO - Beilstein Journal of Nanotechnology
JF - Beilstein Journal of Nanotechnology
SN - 2190-4286
IS - 1
ER -
ID: 174688205