Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 1: Transport: Topological Insulators (jointly with DS, MA, HL, O)
DS 1.1: Talk
Monday, March 20, 2017, 09:30–09:45, HSZ 204
Magnetic excitations in the symmetry protected, topological Haldane phase of SrNi2V2O8 — Vladimir Gnezdilov1,2, Vladimir Kurnosov2, •Peter Lemmens1, A. K. Bera3, A. T. M. N. Islam3, and Bella Lake3 — 1TU-BS, Braunschweig — 2ILTP Kharkov — 3HZB Berlin
We report results of a single-crystal Raman scattering study of the coupled spin-1 Haldane chain compound SrNi2V2O8. In addition to the one-and two-magnon excitations, broad gapless and temperature dependent continua are detected with light polarization parallel to the basal plane. This feature is discussed in terms of spinon-like excitations related to a symmetry protected topological state, of which the Haldane phase in 1D is a preeminent example.
Work supported by RTG-DFG 1952/1, Metrology for Complex Nanosystems and the Laboratory for Emerging Nanometrology, TU Braunschweig.