Possibility of Electron Pairing in Small Metallic Nanoparticles

Abstract

We investigate the possibility of electron pairing in small metallic nanoparticles at zero temperature. In these particles both electrons and phonons are mesoscopic, i.e. modified by the nanoparticle's finite size. The electrons, the phonons, and their interaction are described within the framework of a simplified model. The effective electron-electron interaction is derived from the underlying electron-phonon interaction. The effect of both effective interaction and Coulomb interaction on the electronic spectrum is evaluated. Results are presented for aluminum, zinc and potassium nanoparticles containing a few hundred atoms. We find that a large portion of the aluminum and zinc particles exhibit modifications in their electronic spectrum due to pairing correlations, while pairing correlations are not present in the potassium particles.

References in corpus (9)

• Tunneling in suspended carbon nanotubes assisted by longitudinal phonons
• Particle-Number Projection and the Density Functional Theory
• Vibrations of free and embedded anisotropic elastic spheres: Application to low-frequency Raman scattering of silicon nanoparticles in silica
• Phonons in an Inhomogeneous Continuum: Vibrations of an Embedded Nanoparticle
• Shell Structure and Strengthening of Superconducting Pair Correlation in Nanoclusters
• Metallic nanograins: spatially nonuniform pairing induced by quantum confinement
• Description of Pairing correlation in Many-Body finite systems with density functional theory
• Continuum elastic sphere vibrations as a model for low-lying optical modes in icosahedral quasicrystals
• Density-matrix functionals for pairing in mesoscopic superconductors

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• Pair correlation and dynamic Jahn-Teller effect: high Tc in nanoclusters
• Reduction of electron repulsion and enhancement of $T_c$ in small diffusive superconducting grains