Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 37: Transport - Fluctuations and Noise
TT 37.1: Talk
Wednesday, March 9, 2005, 10:15–10:30, TU H3027
High-frequency shot noise measurement of a quantum point contact — •Udo Hartmann1, Franck Balestro2, Eugen Onac2, Laurens W. van Beveren2, Ronald Hanson2, Yuli V. Nazarov2, and Leo P. Kouwenhoven2 — 1Physics Department and CeNS, Ludwig-Maximilians-Universität München, Theresienstr. 37, 80333 München, Germany — 2Kavli Institute of Nanoscience Delft and ERATO Mesoscopic Correlation Project, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
We present an experimental realisation of a quantum dot (QD) high-frequency noise detector that measures the current shot noise produced by a nearby quantum point contact (QPC) by means of noise-assisted tunnelling. We investigate the dependence of the detector signal on the voltage across the QPC and on the QPC transmissions which is consistent with previous low-frequency measurements [1,2]. We observe and explain the saturation and quantum features in the detector signal.
[1] Y. P. Li, et al., Appl. Phys. Lett. 57, 774 (1990).
[2] A. Kumar et al., Phys. Rev. Lett. 76, 2778 (1996).