论文标题
Z2 Parton阶段在混合维度$ t-j_z $模型中
Z2 parton phases in the mixed-dimensional $t-J_z$ model
论文作者
论文摘要
我们研究了掺杂的反铁磁铁中自旋和电荷自由度的相互作用，其中电荷的运动仅限于一个维度。可以从耦合到Z2晶格量规场的无自旋chargon来理解此混合维度$ t-j_z $模型的相图。抗铁磁耦合会导致Z2电场线之间的相互作用，从而导致在低温下的稳健条纹相。在较高的温度下，发现低掺杂的牢固的介子 - 加气相，而在较高的掺杂值下，可以看到坚固的解构型charg-gas相，该相具有隐藏的抗铁磁阶。我们在量子蒙特卡洛模拟中证实了这些阶段。我们的模型可以实施，并在超低原子实验中使用现有技术检测到其阶段。带有足够高孔浓度的条纹形成的临界温度在于自旋交换能量$ J_Z $，即，在当前实验的范围内。
We study the interplay of spin- and charge degrees of freedom in a doped Ising antiferromagnet, where the motion of charges is restricted to one dimension. The phase diagram of this mixed-dimensional $t - J_z$ model can be understood in terms of spin-less chargons coupled to a Z2 lattice gauge field. The antiferromagnetic couplings give rise to interactions between Z2 electric field lines which, in turn, lead to a robust stripe phase at low temperatures. At higher temperatures, a confined meson-gas phase is found for low doping whereas at higher doping values, a robust deconfined chargon-gas phase is seen which features hidden antiferromagnetic order. We confirm these phases in quantum Monte Carlo simulations. Our model can be implemented and its phases detected with existing technology in ultracold atom experiments. The critical temperature for stripe formation with a sufficiently high hole concentration is around the spin-exchange energy $J_z$, i.e., well within reach of current experiments.
