Steady-state dynamics and effective temperatures of quantum criticality in open systems
Steady-state dynamics and effective temperatures of quantum criticality in open systems
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发表时间：
2015-03
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通讯作者：
S. Kirchner;F. Zamani;P. Ribeiro
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作者：
S. Kirchner;F. Zamani;P. Ribeiro
我们研究了局域量子临界模型的热定态和非热定态标度函数以及定态动力学。我们考虑的模型，即pseudogap Kondo模型，使我们能够研究有效温度的概念附近充分相互作用以及弱耦合不动点。在每个固定点附近，我们建立了有效温度的存在性（在每个固定点处不同），以便恢复平衡波动耗散定理。最值得注意的是，稳态标度函数的有效温度符合平衡标度函数。这一结果延伸到更高的相关函数，明确证明了近藤单线态强度。非线性电荷输运的有效温度方面进行了研究和分析。
We study the thermal and non-thermal steady state scaling functions and the steady-state dynamics of a model of local quantum criticality. The model we consider, i.e. the pseudogap Kondo model, allows us to study the concept of effective temperatures near fully interacting as well as weakcoupling fixed points. In the vicinity of each fixed point we establish the existence of an effective temperature –different at each fixed point– such that the equilibrium fluctuation-dissipation theorem is recovered. Most notably, steady-state scaling functions in terms of the effective temperatures coincide with the equilibrium scaling functions. This result extends to higher correlation functions as is explicitly demonstrated for the Kondo singlet strength. The non-linear charge transport is also studied and analyzed in terms of the effective temperature.