论文标题
非量子量子杂质系统进出平衡：非相互作用情况
Non-Hermitian quantum impurity systems in and out of equilibrium: noninteracting case
论文作者
论文摘要
我们基于精确的计算，我们对非平衡量子杂质系统进行系统分析。为了理解非热性和近藤物理学之间的相互作用，我们专注于具有复杂耦合常数的原型非互动杂质系统，即共振级别模型。明确地构建生物息肉的基础，我们研究了其热力学特性以及loschmidt Echo，从最初断开的两个自由费米链开始。值得注意的是，我们在PT破碎和不间断的政权中观察到Loschmidt Echo中的通用跨界物理学。我们还发现，可以通过分析延续获得PT破裂型中计算的基态数量。事实证明，PT破裂的策略中的围to筛选不再存在，该策略先前也在非富尔米特杂种模型中预测。所有分析结果均对生物持平的免费费米数字进行了佐证。
We provide systematic analysis on a non-Hermitian PT -symmetric quantum impurity system both in and out of equilibrium, based on exact computations. In order to understand the interplay between non-Hermiticity and Kondo physics, we focus on a prototypical noninteracting impurity system, the resonant level model, with complex coupling constants. Explicitly constructing biorthogonal basis, we study its thermodynamic properties as well as the Loschmidt echo starting from the initially disconnected two free fermion chains. Remarkably, we observe the universal crossover physics in the Loschmidt echo, both in the PT broken and unbroken regimes. We also find that the ground state quantities we compute in the PT broken regime can be obtained by analytic continuation. It turns out that Kondo screening ceases to exist in the PT broken regime, which was also previously predicted in the non-hermitian Kondo model. All the analytical results are corroborated against biorthogonal free fermion numerics.
