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arXiv 0908.4542cond-mat.mes-hall
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量子点绝热泵浦中的干涉和相互作用效应

Interference and interaction effects in adiabatic pumping through quantum dots

Bastian Hiltscher, Michele Governale, Jürgen König

摘要:

为了研究绝热泵浦中的干涉和相互作用效应,我们考虑了一个量子点嵌入在一个或两个臂上的Aharonov-Bohm(AB)干涉仪。我们采用了实时的形式主义,我们执行的扩展点和引线之间的隧道耦合强度和泵浦频率,考虑到库仑相互作用非微扰。我们发现单点AB干涉仪中的泵浦具有蠕动但相位相干的特性。在双点AB干涉仪中,我们发现了一种纯粹依赖于量子力学干涉的泵浦机制,并且没有经典的对应机制。

英文摘要:

In order to investigate the effects of interference and interaction in adiabatic pumping, we consider an Aharonov-Bohm (AB) interferometer with a quantum dot embedded either in one or in both arms. We employ a real-time formalism and we perform an expansion both in the tunnel-coupling strengths between dot and leads and in the pumping frequency, taking into account the Coulomb interaction non perturbatively. We find that pumping in a single-dot AB interferometer has a peristaltic but phase-coherent character. In a double-dot AB interferometer, we find a pumping mechanism that relies purely on quantum mechanical interference and has no classical counterpart.

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