标题： 强关联电子系统的有效作用量 显示英文标题

标题： Effective action for strongly correlated electron systems

摘要： su(2|1)相干态路径积分表示在有限掺杂下强关联电子t-J模型的配分函数被推导出来。 涌现的有效作用量与Shankar之前基于现象学提出的用于描述反铁磁体中空穴的作用量（Nucl.Phys. B330 (1990) 433）进行了比较。 发现t-J模型的有效作用量有一个重要的“额外”因子，在Shankar的作用量中没有对应的项。 它代表了无双电子占据的局部约束，并反映了由于强电子关联存在而导致的底层相空间流形的重新排列。 这一重要成分被证明对于描述强关联电子系统的物理性质是必不可少的。 关键词：强关联电子t-J模型；su(2|1)相干态路径积分 显示英文摘要

摘要： The su(2|1) coherent-state path-integral representation of the partition function of the t - J model of strongly correlated electrons is derived at finite doping. The emergent effective action is compared to the one proposed earlier on phenomenological grounds by Shankar to describe holes in an antiferromagnet (Nucl.Phys. B330 (1990) 433). The t - J model effective action is found to have an important "extra" factor with no analogue in Shankar's action. It represents the local constraint of no double electron occupancy and reflects the rearrangement of the underlying phase-space manifold due to the presence of strong electron correlation. This important ingredient is shown to be essential to describe the physics of strongly correlated electron systems. Keywords: t - J model of strongly correlated electrons; su(2|1) coherent-state path integral