The spinon continues to be an elusive elementary excitation of frustrated antiferromagnets. To solidify evidence for its existence, we address the question of what will be the Angle Resolved Photoemission Spectroscopy (ARPES) signatures of single crystal samples of Herbertsmithite assuming it is described by the Dirac spin liquid state. In particular, we show that the electron spectral function will have a linear in energy dependence near specific wave vectors and that this dependence is expected even after fluctuations to the mean field values are taken into account. Observation of this unique signature in ARPES will provide very strong evidence for the existence of spinons in greater than one dimension.
Temperature dependence of spinon and holon excitations in one-dimensional Mott insulators
受最近一维莫特绝缘体SrCuO ${}_{2}$和Na ${}_{0.96}$ V ${}_{2}$ O ${}_{5}$的角分辨光电子能谱(ARPES)测量的启发,我们研究了一维哈伯德模型在半填充时的单粒子光谱权重.我们特别感兴趣的自旋子和holon激发的温度依赖性。为此,我们对一维哈伯德模型的单粒子谱权进行了动力学密度矩阵重整化群和行列式量子蒙特卡罗(QMC)计算。在QMC数据中,自旋子和holon分支在短程反铁磁关联发展的温度下变得可观察到。在这样的温度下,自旋分支迅速生长。根据数值结果,我们讨论了SrCuO ${}_{2}$的ARPES实验中观察到的自旋子和holon分支.这些数值结果也与Na ${}_{0.96}$ V ${}_{2}$ O ${}_{5}$的ARPES结果的温度依赖性一致。
Gauge flux generations of weakly magnetized Dirac spin liquid in a kagomé lattice
International Center for Quantum Materials, School of Physics, Peking University(北京大学物理学院量子材料国际中心);Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学李政道研究所);Collaborative Innovation Center of Quantum Matter(量子物质协同创新中心)
Signatures for spinons in the quantum spin liquid candidate Ca$_{10}$Cr$_7$O$_{28}$
我们提出了新的实验低温热容和详细的动态自旋结构因子数据的量子自旋液体候选材料Ca $_{10}$ Cr $_7$ O $_{28}$。测得的热容量在$0.1$ K $\lesssim T\lesssim0.5$ K范围内显示出几乎完美的线性温度依赖性,这让人想起费米子自旋自由度。自旋结构因子表现出两个能量区的强信号,显示相当不同的,但仅仅是漫散射功能。我们从理论上描述了这些发现的一个有效的自旋跳跃模型,这至关重要的依赖于强铁磁耦合的三角形系统中的存在。我们的自旋理论自然地再现测量自旋结构因子的整体重量分布。特别是,我们认为,各种不同的观察到的自旋结构因子和热容的特征属性一致表明存在的自旋费米面。对最低可达温度下的热容进行更仔细的分析,暗示存在弱$f$波自旋配对项,导致费米表面上存在一个小的部分能隙(除了离散的狄拉克节点),并提出了Ca $_{10}$ Cr $_7$ O $_{28}$的整体$\mathbb{Z}_2$量子自旋液体方案。
Superconducting and charge-ordered phases from Dirac quantum spin liquids on the triangular lattice
Center for Computational Quantum Physics, Flatiron Institute(Flatiron研究所计算量子物理中心);Department of Physics, Harvard University(哈佛大学物理系);Max Planck Institute for Solid State Research(马克斯·普朗克固体研究所)
Quantum geometric magnetic monopole and two-phase superconductivity in CeRh$_2$As$_2$
Department of Physics, Kyoto University(京都大学物理系);RIKEN Center for Emergent Matter Science (CEMS)(理化学研究所新兴物质科学中心);Department of Physics, Niigata University(新潟大学物理系);Institute for Research Administration, Niigata University(新潟大学研究管理研究所)