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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Chiral topological semimetal with multifold band crossings and long Fermi arcs Niels B. M. Schröter , Ding Pei , Maia G. Vergniory , Yan Sun , Kaustuv Manna , Fernando De Juan , Jonas A. Krieger , Vicky Süss , Marcus Schmidt , Pavel Dudin , Barry Bradlyn , Timur K. Kim , Thorsten Schmitt , Cephise Cacho , Claudia Felser , Vladimir N. Strocov , Yulin Chen Nature Physics 353 DOI: 10.1038/s41567-019-0511-y Diamond Proposal Number(s): [19883, 21400] Show Abstract ▼ Abstract: Topological semimetals in crystals with a chiral structure (which possess a handedness due to a lack of mirror and inversion symmetries) are expected to display numerous exotic physical phenomena, including fermionic excitations with large topological charge1, long Fermi arc surface states2,3, unusual magnetotransport4 and lattice dynamics5, as well as a quantized response to circularly polarized light6. So far, all experimentally confirmed topological semimetals exist in crystals that contain mirror operations, meaning that these properties do not appear. Here, we show that AlPt is a structurally chiral topological semimetal that hosts new four-fold and six-fold fermions, which can be viewed as a higher spin generalization of Weyl fermions without equivalence in elementary particle physics. These multifold fermions are located at high symmetry points and have Chern numbers larger than those in Weyl semimetals, thus resulting in multiple Fermi arcs that span the full diagonal of the surface Brillouin zone. By imaging these long Fermi arcs, we experimentally determine the magnitude and sign of their Chern number, allowing us to relate their dispersion to the handedness of their host crystal.	May 2019
I05-ARPES	Buried double CuO chains in YBa2Cu4O8 uncovered by nano-ARPES Hideaki Iwasawa , Pavel Dudin , Kyosuke Inui , Takahiko Masui , Timur K. Kim , Cephise Cacho , Moritz Hoesch Physical Review B 99 DOI: 10.1103/PhysRevB.99.140510 Diamond Proposal Number(s): [21083] Show Abstract ▼ Abstract: Identifying the electron dynamics in CuO chains has been elusive in Y-Ba-Cu-O (YBCO) cuprate systems when using standard angle-resolved photoemission spectroscopy (ARPES); a cleaved sample exhibits areas terminated by both CuO chains or BaO layers, and the size of a typical beam results in ARPES signals that are superposed from both terminations. Here, we employ spatially resolved ARPES with a submicrometric beam (nano-ARPES) to reveal the surface-termination-dependent electronic structures of the double CuO chains in YBa 2 Cu 4 O 8 . We present an observation of sharp metallic dispersions and Fermi surfaces of the double CuO chains buried underneath the CuO 2 -plane block on a BaO-terminated surface. While the observed Fermi surfaces of the CuO chains are highly one dimensional, the electrons in the CuO chains do not undergo significant electron correlations and no signature of a Tomonaga-Luttinger liquid or a marginal Fermi liquid is found. Our work represents an important experimental step toward understanding the charge dynamics and provides a starting basis for modeling the high- T c superconductivity in YBCO cuprate systems.	Apr 2019

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