Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 26: Focus Session: Designer Quantum Systems I (joint session O/TT)

O 26.2: Hauptvortrag

Dienstag, 2. April 2019, 11:00–11:30, H15

Designing Electronic Quantum Matter: Fabrication and Characterization with Atomic Scale Precision — •Ingmar Swart — Debye Institute for Nanomaterials Science

In a visionary colloquium nearly sixty years ago, Richard Feynman proposed to study complex and elusive quantum systems using more controllable analogues, an approach known as quantum simulation [later published, 1]. Although quantum simulation based on ultracold atoms in optical lattices, nanophotonic systems, trapped ions and superconducting circuits has been very fruitful, electronic quantum simulators have been lacking behind [2].

In this talk, I will demonstrate that electron gases on well-defined metal surfaces form an excellent platform for quantum simulation. By patterning the surface with atomic scale precision using a scanning tunneling microscope, the electrons can be corralled into artificial lattices of nearly any geometry. The same microscope can then be used to measure the local density of states at all positions of interest and to probe the spatial extend and shape of the wave functions. I will show several examples of how we exploit the tunability of this platform. Particular emphasis will be given to our recent efforts to create and study electronic higher-order topological insulators.

References: 1. Richard P. Feynman, International Journal of Theoretical Physics, 21, 467 (1982). 2. Nature Physics Insight on Quantum Simulation, Volume 8 (2012).