Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Nanostructures at Surfaces: Metals, Oxides and Semiconductors II
O 41.8: Vortrag
Dienstag, 21. März 2017, 15:45–16:00, REC/PHY C213
Topological States and nearly flat Electron Band in engineered atomic Lattices — •Robert Drost1, 2, Teemu Ohjanen1, Ari Harju1, and Peter Liljeroth1 — 1Aalto University Department of Applied Physics, Puumiehenkuja 2, 02150 Espoo, Finland — 2Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
Topological materials exhibit protected edge or boundary modes that have been proposed for applications in spintronics and quantum computation. The essential physics of several topological systems are captured in two-dimensional tight binding models which can be implemented in artificial lattices. This approach makes it possible to test theoretical proposals in systems with precise control over the models parameters or design quantum materials with tailored properties. We use low-temperature scanning tunnelling microscopy to fabricate such lattices with atomic precision and probe the resulting density of states. We implemented two Hamiltonians of fundamental importance using vacancy defects in a chlorine layer on Cu(100): The Su-Schrieffer-Heeger dimer chain with topological domain walls and the Lieb lattice with a nearly flat electron band.