Multi-Probe Characterization of 1D and 2D Nanostructures Assembled on Ge(001) Surface by Gold Atom Deposition and Annealing
The demand to discover new, alternative solutions in future electronics has currently focused the attention on the possible use of single atomic wires and conductive mesa pads as components in electronic circuits. For such applications, we need a good knowledge of structural and electronic properties of 1D and 2D conductive nanostructures fabricated on large and/or moderate band gap semiconductor surfaces. This chapter is reporting on case studies invoking preparation of well organized atomic wires and 2D conductive pads by self-assembly of gold atoms on clean, reconstructed Ge(001) surface. Structural characterization of the fabricated nanostructures was performed with atomic resolution on low temperature scanning tunneling microscope (LT-STM) and multi-probe STM designed by Omicron Nanotechnology GmbH. Using the far field, high resolution scanning electron microscope (SEM), the pre-prepared nanostructures were identified after an UHV transfer into a multi-probe station of the system, and their surface conductance was measured with two STM probes. The conductance dependence as a function of the inter-probe distance confirmed 2D (surface) character of the Au rich nanostructures assembled on Ge(001).
KeywordsGe(001) Gold nanowires Self-assembly Surface conductance Multi-probe STM Scanning tunneling microscope Scanning electron microscopy
Founding for this research has been provided by EC under Large-scale Integrating Project in FET Proactive of the 7th FP entitled “Atomic scale and single molecule logic gate technologies, AtMol”. The research was carried out with the equipment purchased thanks to the financial support of the European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program (contract no. POIG.02.01.00-12-023/08). S.G. acknowledges financial support received from the Foundation for Polish Science within START program (2010 and 2011).
- 8.Lopez-Moreno, S., Romero, A. H., Munoz, A., Schwingenschloegl, U.: First-principles description of atomic gold chains on Ge(001). Phys. Rev. B 81, 041415 (2010) Google Scholar
- 9.Niikura, R., Nakatsuji, K., Komori, F.: Local atomic and electronic structure of Au-adsorbed Ge(001) surfaces: scanning tunneling microscopy and x-ray photoemission spectroscopy. Phys. Rev. B 83, 035311 (2011)Google Scholar
- 10.Meyer, S., Schaefer, J., Blumenstein, C., Hoepfner, P., Bostwick, A., McChesney, J. L., Rotenberg, E., Claessen, R.: Strictly one-dimensional electron system in Au chains on Ge(001) revealed by photoelectron k-space mapping. Phys. Rev. B 83, 121411(R) (2011)Google Scholar
- 11.Nakatsuji, K., Motomura, Y., Niikura, R., Komori, F.: Shape of metallic band at single-domain Au-adsorbed Ge(001) surface studied by angle-resolved photoemission spec-troscopy. Phys. Rev. B 84, 115411 (2011)Google Scholar
- 12.Blumenstein, C., Schaefer, J., Morresi, M., Mietke, S., Matzdorf, R., Claessen, R.: Symmetry-breaking phase transition without a peierls instability in conducting monoatomic chains. Phys. Rev. Lett. 107, 165702 (2011) Google Scholar
- 15.Berkelaar, R. P., Sode, H., Mocking, T. F., Kumar, A., Poelsema, B., Zandvliet, H. J. W.: Molecular Bridges. J. Phys. Chem. C 115, 2268–2272 (2011)Google Scholar
- 16.Jaschinsky, P., Wensorra, J., Lepsa, M. I., Myslivecek, J., Voigtlaender, B.: Nanoscale charge transport measurements using a double-tip scanning tunneling microscope. J. Appl. Phys. 104, 094307 (2008)Google Scholar