标题： 量子相变附近非厄米简并的库仑类比 显示英文标题

标题： Coulomb analogy for nonhermitian degeneracies near quantum phase transitions

摘要： 研究了厄米算符在复扩展参数空间中靠近实轴的退化点。 我们提出了一种方法来测量选定能级黎曼面上此类退化点的分布，并将其用于量子相变的分类。 结果显示这些退化点的行为与配分函数的复零点类似。 显示英文摘要

摘要： Degeneracies near the real axis in a complex-extended parameter space of a hermitian Hamiltonian are studied. We present a method to measure distributions of such degeneracies on the Riemann sheet of a selected level and apply it in classification of quantum phase transitions. The degeneracies are shown to behave similarly as complex zeros of a partition function.