Experimental test of the high-frequency quantum shot noise theory in a quantum point contact

We report on direct measurements of the electronic shot noise of a quantum point contact at frequencies nu in the range 4-8 GHz. The very small energy scale used ensures energy independent transmissions of the few transmitted electronic modes and their accurate knowledge. Both the thermal energy and...

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Bibliographic Details
Published in:	Physical review letters Vol. 99; no. 23; p. 236803
Main Authors:	Zakka-Bajjani, E, Ségala, J, Portier, F, Roche, P, Glattli, D C, Cavanna, A, Jin, Y
Format:	Journal Article
Language:	English
Published:	United States American Physical Society 07-12-2007
Subjects:	Condensed Matter Mesoscopic Systems and Quantum Hall Effect Physics Quantum Point Contact Shot Noise High Frequency
Online Access:	Get full text
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Summary:	We report on direct measurements of the electronic shot noise of a quantum point contact at frequencies nu in the range 4-8 GHz. The very small energy scale used ensures energy independent transmissions of the few transmitted electronic modes and their accurate knowledge. Both the thermal energy and the quantum point contact drain-source voltage V_{ds} are comparable to the photon energy hnu leading to observation of the shot noise suppression when V_{ds}<hnu/e. Our measurements provide the first complete test of the finite frequency shot noise scattering theory without adjustable parameters.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.99.236803