Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Electronic Structure of Surfaces 2
O 82.4: Vortrag
Freitag, 9. September 2022, 11:15–11:30, S053
The quantum corral: Pertubation by adatoms and bonding description by LCAO — •Andreas Bereczuk1, Martin Steinau1, Fabian Stilp2, Franz Josef Giessbil2, and Klaus Richter1 — 1Institut of Theoretical Physics, University of Regensburg, Germany — 2Institute of Experimental and Applied Physics, University of Regensburg, Germany
The quantum corral, first investigated in 1993 [1] consists of a circle of 48 iron atoms placed on a copper surface and gives rise to a standing wave pattern of the local charge density (LDOS). Afterwards a plurality of different confinement shapes have been investigated [2,3].
We revisited this structure in [4] using atomic force microscope (AFM) and scanning tunneling microscopy (STM). A tight-binding model [5] provides a LDOS in consistency with STM measurements for the original and the perturbed quantum corral. We further consider weak bonds between the AFM tip and the artifical atom, indicated by a widely spread LDOS, by using linear combinations of atomic orbitals (LCAO).
[1] M. F. Crommie et al., Science 262, 218 (1993)
[2] M. Crommie et al., Physica D: Nonlinear Phenomena 83, 98 (1995)
[3] E. Heller et al., Nature 369, 464 (1994)
[4] F. Stilp et al., Science 372, 1196 (2021)
[5] C. W. Groth et al., New J. Phys. 16, 063065 (2014)