Regensburg 2000 – scientific programme

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O: Oberflächenphysik

O 12: Hauptvortrag

O 12.1: Invited Talk

Tuesday, March 28, 2000, 09:30–10:15, H36

Gold Nanowire: Conductance Quantization and Structure — •Kunio Takayanagi — Tokyo Institute of Technology, 4259 Nagatuta, Midori-ku, Yokohama 226-8502, Japan

Quantized point contact(QPC) is the contact between two metal electrodes of which conductance has the integral multiple of 2e2/h, where e is the electron charge and h, Planck constant. We developed an UHV electron microscope which enabled us to see the structure and conductance of gold QPC simultaneously. At the QPC formed is a nanowire suspended between the tip of the scanning tunneling microscope and the gold substrate. Gold nanowires of diameteres less than 1nm were found to have new "magic" structures: helical coil. And especially a single chain of gold atoms, which were imaged by electron microscopy, had extremely long interatomic spacing (0.4 nm). Any mechanism that stabilizes such a linear gold chain is not understood.