论文标题
探测具有淬灭动力学的1D Spin-1/2 XY链中麦迪的可能性
Probing the Possibilities of Ergodicity in the 1D Spin-1/2 XY Chain with Quench Dynamics
论文作者
论文摘要
Ergodicity位于物理系统的统计力学与动力学之间的联系的核心。通过将系统的初始状态固定在零温度下的哈密顿量的基础状态并调整控制参数,我们考虑在横向磁场中的一维(1D)SPIN-1/2 XY模型中以淬灭动力学的形式出现Ergodicition。地下相图由两个铁磁和顺磁性相组成。众所周知,该自旋系统中的磁化是非erer依的。我们设置了两个不同的实验,因为我们称它们为单淬灭,并沿$ z $轴沿磁化的动力学测试沿$ x $轴沿$ z $轴的动力学,这是$ x $ - 轴,这是零温度相的顺序参数。我们的确切结果表明,对于在零温度下的单个淬灭的结果,终端性取决于初始状态和顺序参数。有趣的是,在另一个设置上,在循环路径上进行了双淬灭,从与顺序参数相对应的相位开始,Ergodicity完全断裂。否则,这取决于第一个淬火点,以及在返回第二次淬火之前花费的模型时的淬火时间$ t $,这使得能够控制系统中的千差线。因此,与期望相反,在上述模型中,可以通过在零温度下进行淬灭动力学观察到牙星。我们的结果提供了对量子系统的零温度动力学行为及其连接到奇异性现象的进一步见解。
Ergodicity sits at the heart of the connection between statistical mechanics and dynamics of a physical system. By fixing the initial state of the system into the ground state of the Hamiltonian at zero temperature and tuning a control parameter, we consider the occurrence of the ergodicity with quench dynamics in the one-dimensional (1D) spin-1/2 XY model in a transverse magnetic field. The ground-state phase diagram consists of two ferromagnetic and paramagnetic phases. It is known the magnetization in this spin system is non-ergodic. We set up two different experiments as we call them single and double quenches and test the dynamics of the magnetization along the $Z$-axis and the spin-spin correlation function along the $X$-axis which are the order parameters of the zero-temperature phases . Our exact results reveal that for single quenches at zero-temperature, the ergodicity depends on the initial state and the order parameter. Interestingly on the other setup, a double quench on a cyclic path, ergodicity is completely broken for starting from the phase corresponding to the order parameter. Otherwise, it depends on the first quenched point, and the quench time $T$ when the model spent before a second quench in the way back which gives an ability to controlling the ergodicity in the system. Therefore, and contrary to expectations, in the mentioned model the ergodicity can be observed with probing quench dynamics at zero-temperature. Our results provide further insight into the zero-temperature dynamical behavior of quantum systems and their connections to the ergodicity phenomenon.