Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Nanostructures at Surfaces II

O 22.6: Talk

Monday, March 11, 2013, 17:15–17:30, H45

Self-Doping on Si(111)-(5x2)-Au: Confined Charge Density and Atomic Origin of Electron States — •Ingo Barke, Stefan Polei, Viola v. Oeynhausen, and Karl-Heinz Meiwes-Broer — Institut für Physik, Universität Rostock, 18051 Rostock, Germany

Using atomically precise scanning tunneling spectroscopy (STS) the concept of doping is pushed to the ultimate limit. On an array of atomic chains on Si(111)-(5x2)-Au it is shown that single doping atoms contribute their electrons to a small chain section, terminated by the very dopants themselves [1]. Such confined doping is a direct consequence of reduced dimensionality and is not observed in higher dimensions. This contribution focuses on the particular states affected by local doping on Si(111)-(5x2)-Au. Their doping-dependent energy shift and atomic origin is discussed on the basis of high-resolution STS-maps.

I. Barke, S. Polei, V. von Oeynhausen, and K.-H. Meiwes-Broer, Phys. Rev. Lett, 109, 066801 (2012).