Engineering ultra-strong electron-phonon coupling and nonclassical electron transport in crystalline gold with nanoscale interfaces.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39747046.
- Also identified by DOI 10.1038/s41467-024-55435-z and PMC identifier 11696232.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Electrical resistivity in good metals, particularly noble metals such as gold (Au), silver (Ag), or copper, increases linearly with temperature (T) for T > Θ<sub>D</sub>, where Θ<sub>D</sub> is the Debye temperature. This is because the coupling (λ) between the electrons and the lattice vibrations, or phonons, in these metals is weak, with λ ~ 0.1-0.2. In this work, we outline a nanostructuring strategy of crystalline Au where this concept of metallic transport breaks down. We show that by embedding a distributed network of ultra-small Ag nanoparticles (AgNPs) of radius ~ 1-2 nm inside a crystalline Au shell, the electron-phonon interaction can be enhanced, with an effective λ as high as ≈ 20. With increasing AgNP density, the electrical resistivity deviates from T-linearity and approaches a saturation to the Mott-Ioffe-Regel scale ρ<sub>MIR</sub> ~ ha/e<sup>2</sup> for both disorder (T → 0) and phonon (T ≫ Θ<sub>D</sub>)-dependent components of resistivity (here, a = 0.3 nm, is the lattice constant of Au).