Abstract
We study non-Hermitian collective dynamics of spatially separated edge carbon dimer vibrations in armchair graphene nanoribbons, mediated by coherent and dissipative coupling to nonequilibrium electron transport. We show that the indirect coupling between two dimers depends crucially on gating and source-drain bias. In particular, we analyze the competition between two distinctly different energy transfer mechanism from nonequilibrium electrons to vibrations. One is the deterministic work done by nonconservative current-induced force, and the other is stochastic Joule heating. We find that the effect of the former can be effectively tuned electrically through gating and bias. Our work suggests that armchair graphene nanoribbons could serve as promising candidates in the experimental search for signatures of nonconservative current-induced forces in nanoconductors, which remains elusive despite intense theoretical study.
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