Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 57: Poster Wednesday: Electronic Structure
O 57.4: Poster
Wednesday, September 7, 2022, 18:00–20:00, P4
Interaction between an artificial and a natural atom — •Fabian Stilp, Marco Weiss, and Franz J. Giessibl — University of Regensburg, Regensburg, Germany
The surface state of Cu (111), a quasi-2-dimensional electron gas, is trapped to a small surface area of about 15 x 15 nm2 by placing 48 CO-molecules in a circular shape on the surface via atomic manipulation. By doing so, one creates a quantum corral with discrete electronic states forming an artificial atom. This structure can be described reasonably well by an infinitely high circular potential well leading to corral states with Bessel-type radial functions and an angular momentum normal to the surface. To investigate the interaction between this artificial atom and a natural atom we bring Fe atoms inside the corral and measure the response of the corral states.
Thanks to the large size, one can study the structure of the wave functions within that artificial atom by nc-AFM showing an angular dependence of the corral states after placing the atoms inside the corral. This change of the wave functions leads to an energy shift of a few meV confirmed by tunneling spectroscopy measurements. By investigating the change of the wave functions and the energies of the corral states when placing the adatom inside, one can draw conclusion about the interaction between this artificial atom and a natural atom. Here we expand the interpretation of the adatom acting repulsively on the corral states as stated by Stilp et al. [1].
[1] F. Stilp, A. Bereczuk, J. Berwanger, N. Mundigl, K. Richter, F.J. Giessibl, Science 372, 1196-1200 (2021)