A. N. Chaika, S. S. Nazin, V. N. Semenov, S. I. Bozhko, O. Lübben, S. A. Krasnikov, K. Radican and I. V. Shvets, Selecting the tip electron orbital for scanning tunneling microscopy imaging with sub-ångström lateral resolution, EPL (Europhysics Letters), 92, 4, 2010, 6
EPL (Europhysics Letters); 92; 4;
We report on scanning tunneling microscopy (STM) studies performed with single crystalline W tips on a graphite(0001) surface. Results of distance-dependent STM experiments with sub-ångström lateral resolution and density functional theory electronic structure calculations show how to controllably select one of the tip electron orbitals for high-resolution STM imaging. This is confirmed by experimental images reproducing the shape of the 5dxz,yz and 5dx2 − y2 tungsten atomic orbitals. The presented data demonstrate that the application of oriented single crystalline probes can provide further control of spatial resolution and expand the capabilities of STM.
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