SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 95: Poster Session VII: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces III

O 95.2: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

Exploring inelastic electron tunneling with functionalized STM tip using cluster Hubbard model — •Daria Medvedeva and Jindřich Kolorenč — Institute of Physics, Czech Academy of Sciences, Na Slovance 2, Prague 8, Czech Republic

Inelastic electron tunneling spectroscopy (IETS) is a widely used experimental technique to explore vibrations and magnetic excitations of atoms and molecules adsorbed on metal surfaces [1]. Functionalization of the STM tip, for instance by attaching a magnetic molecule to it, introduces spin sensitivity and expands the possibilities of the scanning-probe technique [2]. We use a co-tunneling theory of STM-IETS [3] to investigate how a nickelocene-terminated tip (Nc-tip) senses excitations in a magnetic system (atom, molecule, cluster of atoms) adsorbed on a surface. In our approximation, the Nc molecule on the tip and the object on the surface are modeled by a cluster Hubbard model (one site for each magnetic atomic shell). We reproduce the spectra measured in STM experiments where the object on the surface was Nc molecule [4] or Fe atom (spin 3/2 with an out-of plane easy axis) [3], and predict spectra for several more complex magnetic systems. In particular, we compare cases with in-plane and out-of-plane easy axis.

[1] J.D.Langan, P.K.Hansma. Surf. Science 52, Issue 1, pp. 211-216, Sept. (1975).

[2] K.W. Hipps, U. Mazur. Inelastic Electron Tunneling Spectroscopy (2006).

[3] B. Verlhac et al. Science 366, 6465, pp. 623-627 (2019).

[4] F. Delgado and J. Fernández-Rossier. PRB 84, 045439 (2011).