论文标题
重金属中的非局部围栏效应和量子关键相位
Nonlocal Kondo effect and quantum critical phase in heavy fermion metals
论文作者
论文摘要
重金属通常在零温度下在零温度下表现出非常规量子临界点或量子临界相，这是由于近距效应和磁性的竞争。以前的理论通常是基于某些局部类型的假设，并且尚未实现实验的完全一致的解释。在这里，我们开发了一种有效的算法，用于schwinger玻色子方法，以探索空间相关性对近托晶格的影响，并引入量子临界区域中非局部近代效应的概念，并用脱糊状的蜘蛛网介绍。我们预测包含具有隐藏的Holon费米表面的非Fermi液体量子临界相和部分扩大的电子费米表面的全局相图，以实现强量子波动，而单个量子临界点的量子波动较弱。这解释了最近在沮丧的昆多晶格cepdal中报道的非同寻常的金属旋转液体，并在ybrh $ _2 $ _2 $ si $ _2 $中解决了费米量难题。我们的理论强调了非本地物理学的重要性，并提供了对沉重的费米量量子关键的统一理解。
Heavy fermion metals typically exhibit unconventional quantum critical point or quantum critical phase at zero temperature due to competition of Kondo effect and magnetism. Previous theories were often based on certain local type of assumptions and a fully consistent explanation of experiments has not been achieved. Here we develop an efficient algorithm for the Schwinger boson approach to explore the effect of spatial correlations on the Kondo lattice and introduce the concept of nonlocal Kondo effect in the quantum critical region with deconfined spinons. We predict a global phase diagram containing a non-Fermi liquid quantum critical phase with a hidden holon Fermi surface and a partially enlarged electron Fermi surface for strong quantum fluctuations while a single quantum critical point for weak quantum fluctuations. This explains the unusual metallic spin liquid recently reported in the frustrated Kondo lattice CePdAl and resolves the Fermi volume puzzle in YbRh$_2$Si$_2$. Our theory highlights the importance of nonlocal physics and provides a unified understanding of heavy fermion quantum criticality.
