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arXiv 1303.7441cond-mat.mes-hallcond-mat.str-el
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强耦合区相互作用量子杂质系统的非平衡性质和非线性效应

Out-of-equilibrium properties and non-linear effects for interacting quantum impurity systems in their strong coupling regime

Loïc Freton, Edouard Boulat

摘要:

我们给出了量子杂质系统中非平衡不动点的精确描述,它能够处理含时强迫。在此基础上,我们表明,分析出的平衡结果,准确地处理相互作用,可以得到在相互作用的量子杂质系统在其强耦合制度,提供他们是可积的\emph{at}平衡,他们是“超级费米液体”,即他们只允许整数电荷跳跃。对于这样的系统,我们建立了一个平衡强耦合扩展,类似于索末菲扩展在相互作用的系统。我们将我们的方法应用到相互作用的谐振能级模型,并获得准确的扩展周围的低能量不动点的通用缩放功能的充电电流作为电压,温度和频率的函数,高达七阶。

英文摘要:

We provide an exact description of out-of-equilibrium fixed points in quantum impurity systems, that is able to treat time-dependent forcing. Building on this, we then show that analytical out-of-equilibrium results, that exactly treat interactions, can be obtained in interacting quantum impurity systems in their strong coupling regime, provided they are integrable \emph{at} equilibrium and they are "super Fermi liquids", i.e. they only allow for integer charge hopping. For such systems we build an out-of-equilibrium strong coupling expansion, akin to a Sommerfeld expansion in interacting systems. We apply our approach to the Interacting Resonant Level model, and obtain the exact expansion around the low energy fixed point of the universal scaling function for the charge current as a function of voltage, temperature, and frequency, up to order seven.

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