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Relativistic horizon of interacting Weyl fermions in condensed matter systems
Wei-Chi Chiu, Guoqing Chang, Gennevieve Macam +12
The intersections of topology, geometry and strong correlations offer many opportunities for exotic quantum phases to emerge in condensed matter systems. Weyl fermions, in particul…
Emergence of Nearly Flat Bands through an Embedded Kagome Lattice in an Epitaxial Two-dimensional Ge Layer on ZrB2(0001)
Antoine Fleurence, Chi-Cheng Lee, Rainer Friedlein +8
Ge atoms segregating on zirconium diboride thin films grown on Ge(111) were found to crystallize into a two-dimensional bitriangular structure which was recently predicted to be a…
Atomic-scale visualization of surface-assisted orbital order
Howon Kim, Yasuo Yoshida, Chi-Cheng Lee +6
Orbital-related physics attracts growing interest in condensed matter research, but direct real-space access of the orbital degree of freedom is challenging. Here we report a first…
Magnetic tunneling induced Weyl node annihilation in TaP
Cheng-Long Zhang, Su-Yang Xu, C. M. Wang +20
Weyl nodes are topological objects in three-dimensional metals. Their topological property can be revealed by studying the high-field transport properties of a Weyl semimetal. Whil…
First-principles method of propagation of tightly bound excitons: exciton band structure of LiF and verification with inelastic x-ray scattering
Chi-Cheng Lee, Xiaoqian M. Chen, Yu Gan +4
We propose a simple first-principles method to describe propagation of tightly bound excitons. By viewing the exciton as a composite object (an effective Frenkel exciton in Wannier…
Spin-Split Conduction band in \eb\ and Tuning of Half-Metallicity with External Stimuli
Jungho Kim, Wei Ku, Chi-Cheng Lee +5
We report Eu L3-edge resonant inelastic x-ray scattering (RIXS) investigation of the electronic structure of EuB6. We observe that the RIXS spectral weight around 1.1 eV increases…
Covalent bonding and magnetism in cuprates
A. C. Walters, T. G. Perring, J. -S. Caux +5
The importance of covalent bonding for the magnetism of 3d metal complexes was first noted by Pauling in 1931. His point became moot, however, with the success of the ionic picture…