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O: Fachverband Oberflächenphysik
O 7: Plasmonics and Nanooptics I
O 7.2: Vortrag
Montag, 18. März 2024, 10:45–11:00, MA 043
Photoelectron imaging of topological edge states in one-dimensional plasmonic Su–Schrieffer–Heeger chains — •Luisa Brenneis1, Benedikt Schurr2,3, Matthias Hensen1, Philipp Kessler1, Bert Hecht2,3, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie — 2NanoOptics Biophotonics Group, Experimental Physics 5 — 3Würzburg-Dresden Cluster of Excellence ct.qmat, 1-3: Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
Plasmonic nanostructures exhibiting different topological phases are proposed to offer unique properties like energy flow along the phase separating interfaces [1] or localized edge states [2]. Here, we use photoemission electron microscopy (PEEM) to directly image the mode pattern of one-dimensional nanochains with trivial and nontrivial topology, representing a plasmonic analogue of a Su–Schrieffer–Heeger chain [3]. To ensure sufficient electron delivery for the photoemission process we exploit Babinet’s principle by investigating nanoslit chains written in monocrystalline gold flakes. The precision of the helium ion beam milling used for this purpose enables us to produce the individual chain elements with a distance down to 8 nm. Therefore, we can precisely control the dipole–dipole coupling between the individual chain elements. By comparing the experimental results with finite-difference time-domain simulations we identify the presence of edge states.
[1] M. Proctor, Appl. Phys. Lett. 118, 091105 (2021).
[2] S. R. Pocock, ACS Photonics 5, 22712279 (2018).
[3] W. P. Su, Phys. Rev. B 22, 2099 (1980).
Keywords: Photoemission electron microscopy; Nanostructures; Su--Schrieffer--Heeger model; Babinet's principle