论文标题
在横向场二重腿梯子中的约束和绑定状态
Confinement and bound states of bound states in a transverse-field two-leg Ising ladder
论文作者
论文摘要
弱耦合的伊斯丁链提供了凝结的凝结。在这些系统中，由于吸引人的相互作用势与颗粒之间的距离线性增加，扭结和抗链球菌结合到介子中。虽然在实验中直接观察到单个介子，但在激发光谱中，多颗粒连续体和结合状态的作用远远不清楚。使用时间依赖性密度矩阵重新归一化组方法，我们研究了铁磁相中的横向场两腿阶梯中单旋和两翼算子的动态结构因子。时间依赖性相关性和两旋式激发光谱的传播揭示了链结合状态的存在，这在单旋转动力学结构因子中不存在。我们还确定了以较高能量出现的两种膜结合状态，高于几个两个嵌入式连续图的阈值。
Weakly coupled Ising chains provide a condensed-matter realization of confinement. In these systems, kinks and antikinks bind into mesons due to an attractive interaction potential that increases linearly with the distance between the particles. While single mesons have been directly observed in experiments, the role of the multiparticle continuum and bound states of mesons in the excitation spectrum is far less clear. Using time-dependent density matrix renormalization group methods, we study the dynamical structure factors of one- and two-spin operators in a transverse-field two-leg Ising ladder in the ferromagnetic phase. The propagation of time-dependent correlations and the two-spin excitation spectrum reveal the existence of interchain bound states, which are absent in the one-spin dynamical structure factor. We also identify two-meson bound states that appear at higher energies, above the thresholds of several two-meson continua.
