Current-induced forces and hot-spots in biased nano-junctions

Abstract

We investigate theoretically the interplay of current-induced forces (CIF), Joule heating, and heat transport inside a current-carrying nano-conductor. We find that the CIF, due to the electron-phonon coherence, can control the spatial heat dissipation in the conductor. This yields a significant asymmetric concentration of excess heating (hot-spot) even for a symmetric conductor. When coupled to the electrode phonons, CIF drive different phonon heat flux into the two electrodes. First-principles calculations on realistic biased nano-junctions illustrate the importance of the effect.

Phys. Rev. Lett. accepted version

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• Structure and local charging of electromigrated Au nanocontacts
• A dynamical model for Brownian molecular motors driven by inelastic electron tunneling
• Hysteresis and effective reciprocity breaking due to current-induced forces