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O: Fachverband Oberflächenphysik

O 48: Poster Session - Electronic Structure of Surfaces: Spectroscopy, Surface States

O 48.7: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/EG

Revisiting the Quantum Corral with combined atomic force and scanning tunneling microscopy — •Fabian Stilp, Julian Berwanger, Nadine Mundigl, and Franz Josef Giessibl — University of Regensburg, 93040 Regensburg, Germany

Cu(111) exhibits a surface state that is scattered by adsorbates, defects and step edges, leading to pronounced interference patterns visible by scanning tunneling microscopy (STM) [1]. In 1993, Crommie et al. [2] confined these surface state electrons into a circular symmetric Quantum Corral with a diameter of about 15 nm assembled from 48 single Fe adatoms. They investigated the Bessel-type eigenstates with scanning tunneling microscopy and tunneling spectroscopy [2]. Afterwards, also elliptic, square and triangular Quantum Corrals [3] were created which lead e.g. to the observation of Quantum Mirages [4]. While STM is only able to image the Quantum Corral’s states close to the Fermi level, atomic force microscopy (AFM) probes all occupied states. We revisit Quantum Corrals with combined STM and AFM using monoatomic metal and CO-terminated tips, probing whether the eigenstates of the Quantum Corral also lead to signatures in the AFM signal.

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

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

[3] Crommie et al. Physica D 83, 98 (1995)

[4] Manoharan et al. Nature 403, 512 (2000)