标题： 有限尺寸标度指数与两能级BCS模型中的纠缠 显示英文标题

标题： Finite-size scaling exponents and entanglement in the two-level BCS model

摘要： 我们分析了两能级BCS模型的有限尺寸特性。 使用连续单位变换技术，我们表明在量子临界点，各种可观测量如磁化强度或自旋-自旋关联函数会出现非平凡的标度指数。 我们还通过纠缠度讨论了基态的纠缠性质，纠缠度在相变处似乎出现奇异性。 显示英文摘要

摘要： We analyze the finite-size properties of the two-level BCS model. Using the continuous unitary transformation technique, we show that nontrivial scaling exponents arise at the quantum critical point for various observables such as the magnetization or the spin-spin correlation functions. We also discuss the entanglement properties of the ground state through the concurrence which appears to be singular at the transition.