论文标题
多体定位与无序的哈伯德链中的合成量规场
Many-body localization with synthetic gauge fields in disordered Hubbard chains
论文作者
论文摘要
我们在存在合成磁场的情况下分析了无序哈伯德模型的定位特性。对水平间距比的分析表明，从厄尔贡到多体局部相的明显过渡。随着磁通量的增加，过渡转向更大的混乱强度。对局部相关性和纠缠熵的动力学的研究表明，电荷激发仍在局部定位，而自旋的自由度在存在合成通量的情况下被定位。磁场的存在增强了这种残留的终端性，动态可观察表明在巨大的无序强度下的定位不完整。此外，我们研究了量子统计数据对局部相关性的影响，并表明硬核玻色子系统的长期自旋振荡被破坏，而不是费米子情况。
We analyze the localization properties of the disordered Hubbard model in the presence of a synthetic magnetic field. An analysis of level spacing ratio shows a clear transition from ergodic to many-body localized phase. The transition shifts to larger disorder strengths with increasing magnetic flux. Study of dynamics of local correlations and entanglement entropy indicates that charge excitations remain localized whereas spin degree of freedom gets delocalized in the presence of the synthetic flux. This residual ergodicity is enhanced by the presence of the magnetic field with dynamical observables suggesting incomplete localization at large disorder strengths. Furthermore, we examine the effect of quantum statistics on the local correlations and show that the long-time spin oscillations of a hard-core boson system are destroyed as opposed to the fermionic case.
