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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS2 Niels B. M. Schroeter , Iñigo Robredo , Sebastian Klemenz , Robert J. Kirby , Jonas A. Krieger , Ding Pei , Tianlun Yu , Samuel Stolz , Thorsten Schmitt , Pavel Dudin , Timur K. Kim , Cephise Cacho , Andreas Schnyder , Aitor Bergara , Vladimir N. Strocov , Fernando De Juan , Maia G. Vergniory , Leslie M. Schoop Science Advances 6 DOI: 10.1126/sciadv.abd5000 Diamond Proposal Number(s): [26098, 20617] Open Access Show Abstract ▼ Abstract: Magnetic Weyl semimetals are a newly discovered class of topological materials that may serve as a platform for exotic phenomena, such as axion insulators or the quantum anomalous Hall effect. Here, we use angle-resolved photoelectron spectroscopy and ab initio calculations to discover Weyl cones in CoS2, a ferromagnet with pyrite structure that has been long studied as a candidate for half-metallicity, which makes it an attractive material for spintronic devices. We directly observe the topological Fermi arc surface states that link the Weyl nodes, which will influence the performance of CoS2 as a spin injector by modifying its spin polarization at interfaces. In addition, we directly observe a minority-spin bulk electron pocket in the corner of the Brillouin zone, which proves that CoS2 cannot be a true half-metal.	Dec 2020
I05-ARPES	Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals M SiS (M = Hf, Zr) C. Chen , X. Xu , J. Jiang , S.-C. Wu , Y. P. Qi , L. X. Yang , M. X. Wang , Y. Sun , N. B. M. Schröter , H. F. Yang , L. M. Schoop , Y. Y. Lv , J. Zhou , Y. B. Chen , S. H. Yao , M. H. Lu , Y. F. Chen , C. Felser , B. H. Yan , Z. K. Liu , Y. L. Chen Physical Review B 95 DOI: 10.1103/PhysRevB.95.125126 Show Abstract ▼ Abstract: Topological Dirac semimetals (TDSs) represent a new state of quantum matter recently discovered that offers a platform for realizing many exotic physical phenomena. A TDS is characterized by the linear touching of bulk (conduction and valance) bands at discrete points in the momentum space [i.e., three-dimensional (3D) Dirac points], such as in Na3Bi and Cd3As2. More recently, new types of Dirac semimetals with robust Dirac line nodes (with nontrivial topology or near the critical point between topological phase transitions) have been proposed that extend the bulk linear touching from discrete points to one-dimensional (1D) lines. In this paper, using angle-resolved photoemission spectroscopy (ARPES), we explored the electronic structure of the nonsymmorphic crystals MSiS (M=Hf, Zr). Remarkably, by mapping out the band structure in the full 3D Brillouin zone (BZ), we observed two sets of Dirac line-nodes in parallel with the kz axis and their dispersions. Interestingly, along directions other than the line nodes in the 3D BZ, the bulk degeneracy is lifted by spin-orbit coupling (SOC) in both compounds with larger magnitude in HfSiS. Our paper not only experimentally confirms a new Dirac line-node semimetal family protected by nonsymmorphic symmetry but also helps understanding and further exploring the exotic properties, as well as practical applications of the MSiS family of compounds.	Mar 2017

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