We investigate theoretically the interplay of current-induced forces (CIFs), Joule heating, and heat transport inside a current-carrying nanoconductor. We find that the CIFs, 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, CIFs drive different phonon heat flux into the two electrodes. First-principles calculations on realistic biased nanojunctions illustrate the importance of the effect.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.114.096801 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Energy dependence of synchronization mode transitions in the delay-coupled FitzHugh-Nagumo system driven by chaotic activity.
Cogn Neurodyn
April 2024
Department of Physics, Central China Normal University, Wuhan, 430079 China.
Energy absorption and consumption are essential for the activity of single neurons and neuronal networks. The synchronization mode transition and energy dependence in a delay-coupled FitzHugh-Nagumo (FHN) neuronal system driven by chaotic activity are investigated in this paper. With the change of chaotic current intensity, it was found that the synchronization mode of coupled neurons undergoes synchronous state, transition state, anti-phase state, alternating asynchronous and anti-phase state, and chaotic current-induced chaotic state.
View Article and Find Full Text PDFViscous Current-Induced Forces.
Phys Rev Lett
July 2024
Fritz Haber Research Center of Molecular Dynamics, The Hebrew University of Jerusalem, Institute of Chemistry, Israel.
We study the motion (translational, vibrational, and rotational) of a diatomic impurity immersed in an electron liquid and exposed to electronic current. An approach based on the linear response time-dependent density functional theory combined with the Ehrenfest dynamics leads to a system of linear algebraic equations, which account for the competing and counteracting effects of the current-induced force (electron wind) and the electronic friction. We find and emphasize the coupling between the center of mass motion and that of the nuclei relative to each other, the feature due to the mediation of the two-body interaction by the environment.
View Article and Find Full Text PDFEnabling Ab Initio Molecular Dynamics under Bias: The CP2K+SMEAGOL Interface for Integrating Density Functional Theory and Non-Equilibrium Green Functions.
J Chem Theory Comput
August 2024
Imperial College London, Department of Chemistry and Thomas Young Centre, Molecular Sciences Research Hub, London W12 0BZ, U.K.
Article Synopsis
- This study introduces a new interface between CP2K, an electronic structure software, and SMEAGOL, a DFT-NEGF code, enabling efficient modeling of quantum transport in various systems under external bias.
- The interface can calculate current-induced forces and has been verified on systems such as a 1D Au wire, a parallel-plate capacitor, and a Au-H-Au junction, showing strong agreement with other computational methods like SIESTA.
- The work demonstrates for the first time that DFT-NEGF can be applied to large-scale molecular dynamics simulations in realistic conditions, expanding its applicability to condensed phase systems.
Theoretical Understanding of Electromigration-Related Surface Diffusion and Current-Induced Force in Ag-Pd Systems.
ACS Omega
July 2024
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
Electromigration, as a common reason for interconnect failure, is becoming increasingly important in the ongoing decrease in the integrated circuit manufacturing process. A study is being carried out utilizing the ab initio calculational method to gain a deeper understanding of electromigration, with a focus on the atom diffusion process in the Ag-Pd alloy system, a commonly used interconnect material. We begin by establishing that the primary mechanism of diffusion is step-edge diffusion on the (111) surface.
View Article and Find Full Text PDFAcoustic noise reduction in the NexGen 7 T scanner.
Magn Reson Med
November 2024
Brain Imaging Center, Helen Wills Neuroscience Institute, University of California, Berkeley, California, USA.
Purpose: Driven by the Lorentz force, acoustic noise may arguably be the next physiological challenge associated with ultra-high field MRI scanners and powerful gradient coils. This work consisted of isolating and mitigating the main sound pathway in the NexGen 7 T scanner equipped with the investigational Impulse head gradient coil.
Methods: Sound pressure level (SPL) measurements were performed with and without the RF coil to assess its acoustic impact.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!