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】

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