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TT: Tiefe Temperaturen
TT 8: Posters Transport
TT 8.13: Poster
Friday, March 4, 2005, 14:00–18:00, Poster TU C
A Gate-Controlled Atomic Quantum Switch — •Fangqing Xie1, Laurent Nittler1, Stefan Brendelberger1, Christian Obermair1, and Thomas Schimmel1,2 — 1Institute for Applied Physics, University of Karlsruhe, D-76128 Karlsruhe, Germany — 2Institute of Nanotechnology, Forschungszentrum Karlsruhe, D-76021 Karlsruhe Germany
An atomic-scale quantum conductance switch is demonstrated which allows to open and close an electrical circuit by the controlled and reproducible reconfiguration of silver atoms within an atomic-scale junction [1]. The only movable parts of the switch are the contacting atoms. The switch is entirely controlled by an external electrochemical voltage applied to an independent third gate electrode. Controlled switching was performed between a quantized, electrically conducting "on-state" exhibiting a conductance of G0 = 2e2/h ( ≈ 1/12.9 k Ω) or preselectable multiples of this value and an insulating "off-state" [2].
[1] F.-Q. Xie, L. Nittler, Ch. Obermair and Th. Schimmel, Phys. Rev. Lett. 93, 128303 (2004).
[2] F.-Q. Xie, Ch. Obermair and Th. Schimmel, Solid State Communications 132, 437-442 (2004).