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arXiv 0806.0547cond-mat.mes-hall
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用于振荡隧道结的库仑阻塞

Coulomb blockade for an oscillating tunnel junction

N. Pauget, F. Pistolesi, M. Houzet

摘要:

我们考虑在固定电极和振荡电极之间形成的隧道结。电荷在结电容器上的积累在纳米机械振荡器上感应出力。该结是电压偏置的,并与阻抗$Z(ω)$串联连接。我们讨论了振荡器的存在如何改变库仑阻塞的图象。机械振子的量子涨落改变了$I$ - $V$特性,特别是在强库仑阻塞极限下.我们表明,振荡器可以考虑通过一个简单的修改电路的有效阻抗。我们详细讨论了单个电感$Z(ω)=iLω$和恒定电阻$Z(ω)=R$的情况。只要稍加修改,该理论也适用于隧道极限下约瑟夫森结的非相干输运。

英文摘要:

We consider a tunnel junction formed between a fixed electrode and an oscillating one. Accumulation of the charge on the junction capacitor induces a force on the nano-mechanical oscillator. The junction is voltage biased and connected in series with an impedance $Z(ω)$. We discuss how the picture of Coulomb blockade is modified by the presence of the oscillator. Quantum fluctuations of the mechanical oscillator modify the $I$-$V$ characteristics particularly in the strong Coulomb blockade limit. We show that the oscillator can be taken into account by a simple modification of the effective impedance of the circuit. We discuss in some details the case of a single inductance $Z(ω)=iLω$ and of a constant resistance $Z(ω)=R$. With little modifications the theory applies also to incoherent transport in Josephson junctions in the tunneling limit.

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