Observation of the e/3 Fractionally Charged Laughlin Quasiparticles

(2) Laboratoire de Microstructures et Microlectronique; B. Etienne (2) ((1) Service de Physique de l'Etat Condens; CEA/Saclay; CNRS; D. C. Glattli (2); France; France); L. Saminadayar (1); Y. Jin (2)

Observation of the e/3 Fractionally Charged Laughlin Quasiparticles

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arxiv cond-mat/9706307 v2 pith:764DPBYZ submitted 1997-06-30 cond-mat

L. Saminadayar (1) , D. C. Glattli (2) , Y. Jin (2) , B. Etienne (2) ((1) Service de Physique de l'Etat Condens , CEA/Saclay , France , (2) Laboratoire de Microstructures et Microlectronique , CNRS

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The existence of fractional charges carrying the current is experimentally demonstrated. Using a 2-D electron system in high magnetic field, we measure the shot noise associated with tunneling in the fractional quantum Hall regime at Landau level filling factor 1/3. The noise gives a direct determination of the quasiparticle charge, which is found to be e*=e/3 as predicted by Laughlin. The existence of e/3 Laughlin quasiparticles is unambiguously confirmed by the shot noise to Johnson-Nyquist noise cross-over found for temperature e*V/2k.

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