论文标题
混合不同各向异性T-J模型的相图
Phase Diagram of Mixed-Dimensional Anisotropic t-J-Models
论文作者
论文摘要
我们研究了两个不同的混合尺寸$ t-j_z-j _ {\ perp} $ - 方格上的模型的相图，其中跳高幅度$ t $在$ x $ - 方向上仅是非零的。首先，玻感，模型，旋转振幅$ j _ {\ perp} $是负的，沿$ x $和$ y $ the lattice的$ y $方向是负相关的，而$ j_z $是各向同性和阳性的。低能物理学的特征是旋转电荷分离：在易于平面的铁磁背景中，孔跳动为自由费。在第二个型号中，$ j _ {\ perp} $仅限于$ x $轴，而$ j_z $剩余且呈阳性。该模型对粒子统计是不可知的，并显示了在低温和高孔浓度下具有抗铁磁性N {é} EL订单的条纹模式，与混合型$ t-j_z $和$ t-j $模型相似。在较低的孔浓度下，可以看到非常强的一阶转变和磁滞回路延伸至高度高的14（1）％孔掺杂。
We study the phase diagram of two different mixed-dimensional $t-J_z-J_{\perp}$-models on the square lattice, in which the hopping amplitude $t$ is only nonzero along the $x$-direction. In the first, bosonic, model, the spin exchange amplitude $J_{\perp}$ is negative and isotropic along the $x$ and $y$ directions of the lattice, and $J_z$ is isotropic and positive. The low-energy physics is characterized by spin-charge separation: the holes hop as free fermions in an easy-plane ferromagnetic background. In the second model, $J_{\perp}$ is restricted to the $x$-axis while $J_z$ remains isotropic and positive. The model is agnostic to particle statistics, and shows stripe patterns with anti-ferromagnetic N{é}el order at low temperature and high hole concentrations, in resemblance of the mixed-dimensional $t-J_z$ and $t-J$ models. At lower hole concentration, a very strong first order transition and hysteresis loop is seen extending to a remarkably high 14(1)% hole doping.
