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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 期刊論文 >  Zero-temperature dephasing of conduction electrons in polycrystalline impure metals


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/71554


    Title: Zero-temperature dephasing of conduction electrons in polycrystalline impure metals
    Authors: Wu GY
    教師: 吳玉書
    Date: 2002
    Publisher: American Physical Society
    Relation: PHYSICAL REVIEW B, American Physical Society, Volume 66,   Issue 4, JUL 15 2002
    Keywords: MESOSCOPIC SYSTEMS
    FILMS
    DECOHERENCE
    SATURATION
    SCATTERING
    Abstract: We propose an intrinsic mechanism for zero-temperature dephasing of conduction electrons in metals. We consider a polycrystalline impure metal and calculate coherent intergrain charge transfer at zero temperature. It is shown that, in the process of transfer, the wave-function amplitude of a conduction electron decays, due to the interference between two alternative ways of charge transfer, each being the exchange process of the other. This decay of amplitude is used to derive an effective dephasing time tau(phi) for the conduction electron. We obtain 1/tau(phi)similar to(E-c/epsilon(f))(l(2)/d(2))/tau, with E-c being the charging energy of a grain, l is the mean free path, d is the grain size, and tau is the elastic scattering time. Using typical values, we estimate tau(phi)similar too(10(-11) s), in agreement with recent experiments. Our result indicates that zero-temperature dephasing can arise from an intrinsic mechanism, e.g., intragrain electron-electron interaction, as demonstrated in this calculation.
    Relation Link: http://www.aps.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/71554
    Appears in Collections:[電機工程學系] 期刊論文

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