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HL: Fachverband Halbleiterphysik

HL 3: Transport: Topological Insulators (jointly with DS, MA, HL, O)

HL 3.1: Vortrag

Montag, 20. März 2017, 09:30–09:45, HSZ 204

Magnetic excitations in the symmetry protected, topological Haldane phase of SrNi₂V₂O₈ — Vladimir Gnezdilov^1,2, 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.