Crossover from phonon- to photon-mediated charge transport observed in metal-cluster compounds | |
Article | |
关键词: FAR-INFRARED ABSORPTION; PERCOLATION-THRESHOLD; HOPPING CONDUCTIVITY; DISORDERED-SYSTEMS; AC CONDUCTIVITY; INSULATOR COMPOSITE; ALUMINUM; BEHAVIOR; SILICON; FILMS; | |
DOI : 10.1103/PhysRevB.57.R15116 | |
来源: SCIE |
【 摘 要 】
We have studied the frequency-dependent conductivity of randomly packed aggregates of ligand-stabilized, monodisperse metal clusters from de to the infrared over 12 decades in frequency. At low frequencies the ac conductivity of these compounds is dominated by phonon-assisted hopping between localized states, and shows scaling behavior as a function of temperature and frequency. Due to the unique structure of these cluster aggregates, the transition from phonon- to photon-mediated charge transport is clearly observed. The data are found to be in excellent quantitative agreement with the two-site tunneling model.
【 授权许可】
Free