Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Nanostructures at surfaces: 1D and 2D structures and networks I
O 59.5: Talk
Wednesday, March 14, 2018, 11:30–11:45, MA 141
Topological states and nearly flat electron band in engineered atomic lattices — •Robert Drost1, 2, Ari Harju1, Teemu Ojanen1, and Peter Liljeroth1 — 1Aalto University School of Science,Espoo, Finland — 2Max-Planck-Institut for Solid State Research, Stuttgart, Germany
Topological materials exhibit protected edge modes that have been proposed for applications in spintronics and quantum computation. Although a number of such systems exist, it would be desirable to be able to test theoretical proposals in an artificial system that allows precise control over key parameters of the model. The essential physics of several topological systems can be captured by low-dimensional tight-binding models which can also be implemented in artificial lattices. Here, we apply this method using a vacancy lattice in a chlorine monolayer on Cu(100). We use low-temperature scanning tunnelling microscopy to fabricate such lattices with atomic precision and probe the resulting local density of states. We implement of two tight-binding models of fundamental importance: the polyacetylene (dimer) chain with topological domain-wall states, and the Lieb lattice with a flat electron band. These results provide an important step forward in the ongoing effort to realize designer quantum materials with tailored properties.