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arXiv 1106.5871math-phcond-mat.stat-mechhep-thmath.MP
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星图上量子系统的非平衡定态

Non-equilibrium Steady States of Quantum Systems on Star Graphs

Mihail Mintchev

摘要:

构造了星图上量子场的非平衡定态。这些状态由温度和化学势参数化,与图的每条边相关联。时间反演不变性被自发地破坏。我们研究在这个一般的框架中的薛定谔和狄拉克系统的输运性质的星图,模拟量子线结。使系统偏离平衡的相互作用被定位在图的顶点。所有的点样顶点相互作用,产生自伴哈密顿可能涉及到最小的耦合到周围空间中的静态电磁场,被认为是。在这种情况下,我们计算精确的电恒定电流和非平衡电荷密度。我们还研究了热输运,并推导出Casimir能量密度远离平衡。建立了电荷和能量密度沿图的边缘的Friedel型振荡的外观。最后,我们专注于噪声功率,并讨论了非平凡的影响的点样相互作用的噪声。

英文摘要:

Non-equilibrium steady states of quantum fields on star graphs are explicitly constructed. These states are parametrized by the temperature and the chemical potential, associated with each edge of the graph. Time reversal invariance is spontaneously broken. We study in this general framework the transport properties of the Schroedinger and the Dirac systems on a star graph, modeling a quantum wire junction. The interaction, which drives the system away from equilibrium, is localized in the vertex of the graph. All point-like vertex interactions, giving rise to self-adjoint Hamiltonians possibly involving the minimal coupling to a static electromagnetic field in the ambient space, are considered. In this context we compute the exact electric steady current and the non-equilibrium charge density. We investigate also the heat transport and derive the Casimir energy density away from equilibrium. The appearance of Friedel type oscillations of the charge and energy densities along the edges of the graph is established. We focus finally on the noise power and discuss the non-trivial impact of the point-like interactions on the noise.

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