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Topological triplon modes and bound states in a Shastry-Sutherland magnet

McClarty, PA; Krueger, F; Guidi, T; Parker, SF; Refson, K; Parker, AW; Prabhakaran, D; (2017) Topological triplon modes and bound states in a Shastry-Sutherland magnet. Nature Physics , 13 (8) pp. 736-741. 10.1038/NPHYS4117. Green open access

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Abstract

The twin discoveries of the quantum Hall effect, in the 1980s, and of topological band insulators, in the 2000s, were landmarks in physics that enriched our view of the electronic properties of solids. In a nutshell, these discoveries have taught us that quantum mechanical wavefunctions in crystalline solids may carry nontrivial topological invariants which have ramifications for the observable physics. One of the side effects of the recent topological insulator revolution has been that such physics is much more widespread than was appreciated ten years ago. For example, while topological insulators were originally studied in the context of electron wavefunctions, recent work has initiated a hunt for topological insulators in bosonic systems: in photonic crystals in the vibrational modes of crystals, and in the excitations of ordered magnets. Using inelastic neutron scattering along with theoretical calculations, we demonstrate that, in a weak magnetic field, the dimerized quantum magnet SrCu2(BO3)2 is a bosonic topological insulator with topologically protected chiral edge modes of triplon excitations.

Type: Article
Title: Topological triplon modes and bound states in a Shastry-Sutherland magnet
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/NPHYS4117
Publisher version: http://doi.org/10.1038/NPHYS4117
Language: English
Additional information: © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, GROUND-STATE, SRCU2(BO3)(2), EXCITATIONS, ANTIFERROMAGNET, INSULATORS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1555668
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