论文标题
T-J模型中伪制品金属的奴隶玻色子描述
A slave boson description of pseudogap metals in t-J models
论文作者
论文摘要
我们为单个频段T-J模型提供了标准U（1）的从属玻色子构建的简单修改，该模型构成了旋转子和果实的两粒子结合状态。这种结构自然会产生分数的费米液体基态，其特征是在没有断裂的对称性的情况下，带有各向异性的准粒子重量。在特定参数方面，我们的方法将方格晶格T-J模型映射到广义量子二聚体模型，该模型是作为金属pseudogap阶段的玩具模型引入的，该模型是[PNAS 112,9552-9557（2015）]中的孔掺杂库。我们的奴隶玻色子构造捕获了节点 - 抗原二分法的基本特征，并直接描述了电子光谱函数中尖锐的Fermi弧形特征。此外，它允许研究分数化费米液相和超导体或普通费米液体之间的量子相变。
We present a simple modification of the standard U(1) slave boson construction for the single band t-J model which accounts for two-particle bound states of spinons and holons. This construction naturally gives rise to fractionalized Fermi liquid ground states, featuring small, hole-like pocket Fermi surfaces with an anisotropic quasiparticle weight in the absence of broken symmetries. In a specific parameter regime our approach maps the square lattice t-J model to a generalized quantum dimer model, which was introduced as a toy model for the metallic pseudogap phase in hole-doped cuprates in [PNAS 112,9552-9557 (2015)]. Our slave boson construction captures essential features of the nodal-antinodal dichotomy and straightforwardly describes sharp, Fermi arc-like features in the electron spectral function. Moreover, it allows to study quantum phase transitions between fractionalized Fermi liquid phases and superconductors or ordinary Fermi liquids.
