Tunable Weyl and Dirac states in the nonsymmorphic compound CeSbTe.

Autor:	Schoop LM; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany., Topp A; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany., Lippmann J; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany., Orlandi F; ISIS Neutron Pulsed Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Oxford OX11 0QX, UK., Müchler L; Department of Chemistry, Princeton University, Princeton, NJ 08544, USA., Vergniory MG; Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastian, Spain.; Ikerbasque, Basque Foundation for Science, E-48011 Bilbao, Spain., Sun Y; Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany., Rost AW; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany.; Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany., Duppel V; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany., Krivenkov M; Elektronenspeicherring BESSY II, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany., Sheoran S; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany., Manuel P; ISIS Neutron Pulsed Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Oxford OX11 0QX, UK., Varykhalov A; Elektronenspeicherring BESSY II, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany., Yan B; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel., Kremer RK; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany., Ast CR; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany., Lotsch BV; Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany.; Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377 München, Germany.; Nanosystems Initiative Munich and Center for Nanoscience, Schellingstrasse 4, 80799 München, Germany.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2018 Feb 23; Vol. 4 (2), pp. eaar2317. Date of Electronic Publication: 2018 Feb 23 (Print Publication: 2018).
DOI:	10.1126/sciadv.aar2317
Abstrakt:	Recent interest in topological semimetals has led to the proposal of many new topological phases that can be realized in real materials. Next to Dirac and Weyl systems, these include more exotic phases based on manifold band degeneracies in the bulk electronic structure. The exotic states in topological semimetals are usually protected by some sort of crystal symmetry, and the introduction of magnetic order can influence these states by breaking time-reversal symmetry. We show that we can realize a rich variety of different topological semimetal states in a single material, CeSbTe. This compound can exhibit different types of magnetic order that can be accessed easily by applying a small field. Therefore, it allows for tuning the electronic structure and can drive it through a manifold of topologically distinct phases, such as the first nonsymmorphic magnetic topological phase with an eightfold band crossing at a high-symmetry point. Our experimental results are backed by a full magnetic group theory analysis and ab initio calculations. This discovery introduces a realistic and promising platform for studying the interplay of magnetism and topology. We also show that we can generally expand the numbers of space groups that allow for high-order band degeneracies by introducing antiferromagnetic order.
Databáze:	MEDLINE
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