Engineering ultra-strong electron-phonon coupling and nonclassical electron transport in crystalline gold with nanoscale interfaces

Shreya Kumbhakar (), Tuhin Kumar Maji (), Binita Tongbram, Shinjan Mandal, Shri Hari Soundararaj, Banashree Debnath, Phanindra Sai T, Manish Jain, H. R. Krishnamurthy, Anshu Pandey and Arindam Ghosh ()
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Shreya Kumbhakar: Indian Institute of Science
Tuhin Kumar Maji: Indian Institute of Science
Binita Tongbram: Indian Institute of Science
Shinjan Mandal: Indian Institute of Science
Shri Hari Soundararaj: Indian Institute of Science
Banashree Debnath: Indian Institute of Science
Phanindra Sai T: Indian Institute of Science
Manish Jain: Indian Institute of Science
H. R. Krishnamurthy: Indian Institute of Science
Anshu Pandey: Indian Institute of Science
Arindam Ghosh: Indian Institute of Science

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Electrical resistivity in good metals, particularly noble metals such as gold (Au), silver (Ag), or copper, increases linearly with temperature (T) for T > ΘD, where ΘD 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 ρMIR ~ ha/e2 for both disorder (T → 0) and phonon (T ≫ ΘD)-dependent components of resistivity (here, a = 0.3 nm, is the lattice constant of Au).

Date: 2025
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DOI: 10.1038/s41467-024-55435-z

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