据悉，在研究欠空穴掺杂铜氧化物的一个长期存在的问题是，如何描述高磁场量子振荡下的费米面，以及它们与较高温度伪能隙金属态的联系。文献[Phys. Rev. Lett. 106, 226402 (2011)]提出，伪能隙“费米弧”在磁场诱导的电荷密度波序的作用下，会重构为一个电子口袋。但基于该模型的计算 [Zhang and Mei, Europhys. Lett. 114, 47008 (2016)]显示，来自完成费米弧的空穴口袋背面的费米面，会产生一个未被观测到的额外振荡频率。
该研究团队描述了一种从伪能隙金属的分数化费米液体（FL）模型，向具有双向电荷密度波序且无分数化的金属的转变。研究人员证明，在此转变过程中，FL中费米子自旋子激发的约束可以消除未观测到的振荡频率。
附：英文原文
Title: Quantum oscillations in the hole-doped cuprates and the confinement of spinons
Author: Bonetti, Pietro M., Christos, Maine, Sachdev, Subir
Issue&Volume: 2024-12-3
Abstract: A long-standing problem in the study of the under-hole-doped cuprates has been the description of the Fermi surfaces underlying the high magnetic field quantum oscillations, and their connection to the higher temperature pseudogap metal. Harrison and Sebastian [Phys. Rev. Lett. 106, 226402 (2011)] proposed that the pseudogap “Fermi arcs” are reconstructed into an electron pocket by field-induced charge density wave order. But computations on such a model [Zhang and Mei, Europhys. Lett. 114, 47008 (2016)] show an unobserved additional oscillation frequency from a Fermi surface arising from the backsides of the hole pockets completing the Fermi arcs. We describe a transition from a fractionalized Fermi liquid (FL*) model of the pseudogap metal, to a metal with bidirectional charge density wave order without fractionalization. We show that the confinement of the fermionic spinon excitations of the FL* across this transition can eliminate the unobserved oscillation frequency.
DOI: 10.1073/pnas.2418633121
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2418633121