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HL: Fachverband Halbleiterphysik

HL 53: Poster II

HL 53.30: Poster

Mittwoch, 9. März 2016, 09:30–13:30, Poster A

Ray Optics with Ballistic Electrons — •Jaan Freudenfeld¹, Sergey Platonov^1,2, Vladimir Umansky³, and Stefan Ludwig^1,2 — ¹Center for NanoScience & Fakultät für Physik, LMU-Munich, 80539 München, Germany — ²Paul-Drude-Institut für Festkörperphysik Hausvogteiplatz 5-7 10117 Berlin, Germany — ³Weizmann Institute of Science, Rehovot 76100, Israel

Precise control of the motion of ballistic electrons on the nanoscale would be a major step towards the realization of integrated electronic quantum circuits. We explore the feasibility of ray optics with ballistic electrons in a high mobility two-dimensional electron system to reach this goal. Our device contains two gate defined quantum point contacts coupled either via parabolic mirrors or an electrostatic lens. A lens for electron diffraction works by modulation of the Fermi velocity just as light is diffracted if its velocity is modulated [1,2]. We present first experiments of the coupled conductance of two QPCs in series, where the QPCs are located in the focus points of a lens in between.

[1] J. Spector et al., Appl. Phys. Lett. 56, 1290 (1990)

[2] U. Sivan et al., Phys. Rev. B 41, 7937(R) (1990)