2016/04/30 by Yuta Murakami, Y. Murakami, Philipp Werner +5 · 18 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Amplitude #Condensed matter physics #Coupling (piping) #Electron #Higgs boson #Magnetic damping #Materials science #Phonon #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Quasiparticle #Relaxation (psychology) #Superconductivity #Vibration #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.94.115126
published in Physical review. B./Physical review. B 94(11) (American Physical Society) · 7 pages,6 figures
openalex publication_date 2016/09/12 · arxiv created 2016/09/18 · arxiv updated 2016/09/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the effect of strong electron-phonon interactions on the damping of the Higgs amplitude mode in superconductors by means of nonequilibrium dynamical mean-field simulations of the Holstein model. In contrast to the BCS dynamics, we find that the damping of the Higgs mode strongly depends on the temperature, becoming faster as the system approaches the transition temperature. The damping at low temperatures is well described by a power law, while near the transition temperature the damping shows exponential-like behavior. We explain this crossover in terms of a temperature-dependent quasiparticle lifetime caused by the strong electron-phonon coupling, which smears the superconducting gap edge and makes the relaxation of the Higgs mode into quasiparticles more efficient at elevated temperatures. We also reveal that the phonon dynamics can soften the Higgs mode, which results in a slower damping.