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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Observation and control of maximal Chern numbers in a chiral topological semimetal Niels B. M. Schroeter , Samuel Stolz , Kaustuv Manna , Fernando De Juan , Maia G. Vergniory , Jonas A. Krieger , Ding Pei , Thorsten Schmitt , Pavel Dudin , Timur K. Kim , Cephise Cacho , Barry Bradlyn , Horst Borrmann , Marcus Schmidt , Roland Widmer , Vladimir N. Strocov , Claudia Felser Science 369, 179 - 183 DOI: 10.1126/science.aaz3480 Diamond Proposal Number(s): [24703, 20617] Open Access Show Abstract ▼ Abstract: Topological semimetals feature protected nodal band degeneracies characterized by a topological invariant known as the Chern number (C). Nodal band crossings with linear dispersion are expected to have at most \|C\|=4 \| C \| = 4 , which sets an upper limit to the magnitude of many topological phenomena in these materials. Here, we show that the chiral crystal palladium gallium (PdGa) displays multifold band crossings, which are connected by exactly four surface Fermi arcs, thus proving that they carry the maximal Chern number magnitude of 4. By comparing two enantiomers, we observe a reversal of their Fermi-arc velocities, which demonstrates that the handedness of chiral crystals can be used to control the sign of their Chern numbers.	Jul 2020
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

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