Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Scanning probe techniques: Method development I
O 2.5: Vortrag
Montag, 12. März 2018, 11:30–11:45, MA 004
Iso-dI/dV - Imaging isodensity contours of molecular states with STM — •Gaël Reecht1, Benjamin W. Heinrich1, Hervé Bulou2, Fabrice Scheurer2, Laurent Limot2, and Guillaume Schull2 — 1Freie Universität Berlin , Berlin ,Germany — 2IPCMS, Strasbourg, France
One of the reason for the success of the Scanning Tunneling Microscopy is the ability to probe the density of states (DOS) of nanostructures adsorbed on surfaces with atomic precision. For mapping the spatial distribution of the DOS, usually constant current or constant height scanning mode is used. Here, we present an alternative method for imaging the DOS of a sample with STM, which consists in mapping the surface topography while keeping the differential conductance (dI/dV) constant [1]. We employ this method, we call iso-dI/dV mapping, to explore archetypical C60 molecules on Cu(111). While conventional constant current and constant height mapping methods fail to correctly reproduce the spatial distribution for several orbitals of the C60, the iso-dI/dV maps are in excellent agreement with theoretical simulations of the isodensity contours of the molecular orbitals. Moreover, a direct visualization and unambiguous identification of superatomic C60 orbitals and their hybridization is possible.
[1] Reecht et al., New J. Phys., 19, 113033 (2017)