Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 18: Nanostructures II
O 18.2: Talk
Tuesday, March 28, 2006, 11:30–11:45, PHY C213
Electron confinement in nm-size vacancy islands — •Guillemin Rodaray1, Haifeng Ding1,2, Dirk Sander1, and Jürgen Kirschner1 — 1Max-Planck-Institutfür Mikrostrukturphysik, Weinberg 2, D-06120 Halle — 2Department of Physics, Nanjing University, Nanjing,China
We have studied the electron confinement in hexagonal vacancy islands on Cu(111) by low temperature scanning tunneling microscopy (STM). Hexagonal vacancy islands on Cu(111) are formed upon deposition of sub-monolayer amounts of Co at 320 K [1]. The vacancy islands are one atomic layer deep (0.2 nm), and are surrounded by straight step edges, which form hexagons with sizes in the nm range. Surface state electrons of Cu(111) are scattered at the vacancy hole edge. This gives rise to characteristic electron standing wave patterns inside the vacancy hole and on the terraces surrounding the hole. These electron standing waves are imaged and analyzed by scanning tunneling spectroscopy (STS) at 7 K. The dispersion relation of the confined electrons is derived for different vacancy hole diameters ranging from 5–15 nm and compared to those measured at straight terrace step edges. The origin of the standing wave pattern in the hole is discussed in view of the quantum corral model [2].
[1] J. de la Figuera, J. E. Prieto, C. Ocal, R. Miranda, Phys. Rev. B 47(1993)13043; M. Klaua, H. Höche, H. Jenniches, J. Barthel, J. Kirschner, Surf. Sci. 381(1993)106.
[2] H. C. Manoharan, C. P. Lutz, D. M. Eigler, Nature 403 (2000) 512; V.S. Stepanyuk, L. Niebergall, W. Hergert, P. Bruno, Phys. Rev. Lett. 94(2005)187201.