时变磁场下杂质对Heisenberg XXX链纠缠特性的影响

使用协作参量(concurrence)推导了掺杂Heisenberg XXX链在受到外加时变磁场时纠缠度的表达式,并计算分析了该模型在杂质影响下的热纠缠和时间纠缠.随着杂质格点与正常格点之间的耦合强度J的增大,在不同的区间内,系统的纠缠特性明显不同,其中一种具有典型的过渡性质.在正常区间,系统的热纠缠表现出类似的演化性质,但其初始纠缠度和临界温度T c具有很大不同,系统的时间纠缠呈相似的周期性演化.在过渡区间,系统的热纠缠和时间纠缠与正常情况相比均产生了明显变化,体现出系统的复杂性.

Influence of impurities on entanglement properties of Heisenberg XXX chain in time-varying magnetic fields

Entanglement expression of impure Heisenberg XXX chain in the extra time-varying magnetic field was deduced by concurrence, the thermal entanglement and time entanglement of the model affected by impurities were calculated and analyzed. In different intervals, entanglement properties of the system were obviously different with the increasing coupling strength between impurity lattice and normal lattice, one of that had a typical transitional property. The system thermal entanglement showed similar evolution properties at normal intervals, but its initial entanglement and critical temperature Tc were quite different, and system time entanglement showed analogous cyclical evolution. At transitional intervals, the thermal entanglement and time entanglement of system had significant changes compared with the normal situation, and that reflected the complexity of system.