单壁碳纳米管弱连接:从Fabry-Pérot到Kondo机制
Single-walled carbon nanotube weak links: from Fabry-Pérot to Kondo regime
摘要:
我们研究了近藤制度下单壁碳纳米管中的邻近诱导超电流,并将其与在同一管上获得的Fabry-Pérot共振超电流进行了比较。我们的数据显示宽分布的近藤温度\emph{$T_K$} = 1 - 14 K,和测得的临界电流$I_{CM}$与\emph{$T_K$}显示两个不同的分支,这些分支,区分为零偏置分裂的正常状态近藤电导峰,不同的数量级在大值的$T_K$。同时也发现了近藤区Andreev能级重正化的证据。
英文摘要:
We have investigated proximity-induced supercurrents in single-walled carbon nanotubes in the Kondo regime and compared them with supercurrents obtained on the same tube with Fabry-Pérot resonances. Our data display a wide distribution of Kondo temperatures \emph{$T_K$} = 1 - 14 K, and the measured critical current $I_{CM}$ vs. \emph{$T_K$} displays two distinct branches; these branches, distinguished by zero-bias splitting of the normal-state Kondo conductance peak, differ by an order of magnitude at large values of $T_K$. Evidence for renormalization of Andreev levels in Kondo regime is also found.
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