论文标题
量子链中的非局部假蛋白动力学
Nonlocal pseudospin dynamics in a quantum Ising chain
论文作者
论文摘要
在量子的非平凡阶段存在拓扑零模式，不仅会导致类似Kramers样的退化频谱，而且还导致了在有序阶段中非铁扰动的动态响应（2021Phys。Thys。Thys。Lett。126116401）。在这项工作中，我们调查了退化光谱对遗传干扰的可能反应。我们在有序阶段提供了模型的单粒子描述，并与以伪蛋白为特征的内部自由度相关联。由静态和非局部扰动而产生的有效磁场作用于伪旋转。我们表明，可以通过局部扰动下的淬火来实现字符串操作员的动作。作为一种应用，可以选择带有扰动的哈密顿量的任何基态和激发状态，以通过添加其他扰动来触发淬火并测量Loschmidt Echo来识别量子相。
The existence of topological zero modes in nontrivial phase of quantum Ising chain results in not only the Kramers-like degeneracy spectrum, but also dynamic response for non-Hermitian perturbation in the ordered phase (2021 Phys. Rev. Lett. 126 116401). In this work, we investigate the possible response of the degeneracy spectrum for Hermitian perturbations. We provide a single-particle description of the model in the ordered phase, associating with an internal degree of freedom characterized as a pseudospin. The effective magnetic field, arising from both local and nonlocal perturbations in terms of string operators, acts on the pseudospin. We show that the action of string operator can be realized via a quench under the local perturbations. As an application, any ground states and excited states for the Hamiltonian with perturbation can be selected to identify the quantum phase, by adding the other perturbations to trigger a quench and measuring the Loschmidt echo.
