Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 10: Topology: Artificial Systems

FM 10.1: Invited Talk

Monday, September 23, 2019, 14:00–14:30, 1199

Engineered electronic states in atomic lattices and hybrid 2D systems — •Peter Liljeroth — Department of Applied Physics, Aalto University School of Science, PO Box 15100, 00076 Aalto, Finland

Constructing designer materials with engineered electronic properties is one of the emerging topics in condensed matter physics. I will discuss this approach using examples based on atomic manipulation by the tip of a scanning tunneling microscope (STM), molecular self-assembly, and direct growth of hybrid 2D materials to reach the desired structures.

Using atomic manipulation, it is possible to construct lattices where every atom is in a well-defined, predetermined position. This opens possibilities for creating artificial materials and I will illustrate this concept by showing how chlorine vacancies on Cu(100) [1] can be used to implement various one-dimensional artificial lattices with topological domain wall states and engineered band structures with flat bands.[2,3]

In the second part of the talk, I will focus on the kind of engineered electronic states that can be realized in hybrid structures consisting of magnetic and superconducting transition metal dichalcogenides. Direct molecular-beam epitaxy growth allows the construction of vertical heterostructures with clean and high-quality interfaces,[4] which is of importance for the realization of the possible edge modes.

[1] F.E. Kalff et al. Nat. Nanotech. 11, 926 (2016). [2] R. Drost et al. Nat. Phys. 13, 668 (2017). [3] Md N. Huda et al. in preparation. [4] S. Kezilebieke et al. in preparation.