Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 22: Transport - Nanoelectronics II: Quantum Dots and Wires, Point Contacts
TT 22.4: Vortrag
Montag, 7. März 2005, 14:45–15:00, TU H2053
Conduction Channels of One-Atom Zinc Contacts — •Michael Häfner1, Patrick Konrad2, Fabian Pauly1, Juan-Carlos Cuevas1,3, and Elke Scheer2 — 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany — 2Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 3Departamento de Física Teórica de la Materia Condensada C-V, Universidad Autónoma de Madrid, 28049 Madrid, Spain
We have determined the transmission coefficients of atomic-sized Zn contacts using a new type of breakjunction which contains a whisker as a central bridge. We find that in the last conductance plateau the transport is unexpectedly dominated by a well-transmitting single conduction channel. We explain the experimental findings with the help of a tight-binding model which shows that in an one-atom Zn contact the current proceeds through the 4s and 4p orbitals of the central atom.