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    題名: Effect of transport-induced charge inhomogeneity on point-contact Andreev reflection spectra at ferromagnet-superconductor interfaces
    作者: 郭光宇
    Hsu, Ya-Fen;Chiang, Tien-Wei;Guo, Guang-Yu;Lee, Shang-Fan;Liang, Jun-Jih
    貢獻者: 應物所
    關鍵詞: Andreev reflection;point contact;spin-polarization;ferromagnet;superconductor
    日期: 2012.07
    上傳時間: 2014-01-24 12:53:58 (UTC+8)
    摘要: We investigate the transport properties of a ferromagnet–superconductor interface within the framework of a modified three-dimensional Blonder–Tinkham–Klapwijk formalism. In particular, we propose that charge inhomogeneity forms via two unique transport mechanisms, namely, evanescent Andreev reflection and evanescent quasiparticle transmission. Furthermore, we take into account the influence of charge inhomogeneity on the interfacial barrier potential and calculate the conductance as a function of bias voltage. Point-contact Andreev reflection (PCAR) spectra often show dip structures, large zero-bias conductance enhancement, and additional zero-bias conductance peak. Our results indicate that transport-induced charge inhomogeneity could be a source of all these anomalous characteristics of the PCAR spectra. ©2012 The Physical Society of Japan
    關聯: Journal of the Physical Society of Japan, 81, 084704
    資料類型: article
    DOI 連結: http://dx.doi.org/10.1143/JPSJ.81.084704
    DOI: 10.1143/JPSJ.81.084704
    顯示於類別:[應用物理研究所 ] 期刊論文

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