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O: Fachverband Oberflächenphysik

O 36: Poster Session III: Electronic structure of surfaces: Spectroscopy, surface states I

O 36.3: Poster

Tuesday, March 2, 2021, 10:30–12:30, P

Lifetime-measurements of surface electrons enclosured in a circular CO-Quantum Corral on Cu(111) — •Marco Weiss, Jakob Fuchs, Fabian Stilp, and Franz Josef Giessibl — University of Regensburg, 93040 Regensburg, Germany

Adsorbates scatter surface state electrons exhibited by a Cu(111) surface [1]. Artificial manipulation of these microscopic scatterers opens the path to a variety of manmade surface-potential landscapes. In 1993 Crommie et al. [2] assembled 48 Fe adatoms in a ring form shape with a diameter of about 15 nm. This so called Quantum Corral confines the surface electrons within a circular symmetric potential well. These past investigations revealed discrete, Bessel-type eigenstates of the enclosured electrons by using scanning tunneling microscopy and tunneling spectroscopy. But these studies on the Fe-Quantum-Corral showed a disadvantageous movement of the Corral-walls during spectroscopic measurements. [2]

Our solution approach for this problem is to use CO-molecules for upgrading the Quantum Corral with more stable walls. This permits a more reliable access for the spectroscopic analysis of this artificially built atomic feature. This poster presents the results of our spectroscopic investigations on the CO-Corral. The main focus is on determining the lifetime of such enclosuered surface state electrons.

[1] Crommie et al. Nature 363, 524 (1993)

[2] Crommie et al. Science 262, 218 (1993)