Kondo correlation in a spin polarized quantum dot (QD) results from the dynamical formation of a spin singlet between the dot's net spin and a Kondo cloud of electrons in the leads, leading to enhanced coherent transport through the QD. We demonstrate here significant dephasing of such transport by coupling the QD and its leads to potential fluctuations in a nearby "potential detector." The qualitative dephasing is similar to that of a QD in the Coulomb blockade regime in spite of the fact that the mechanism of transport is quite different. A much stronger than expected suppression of coherent transport is measured, suggesting that dephasing is induced mostly in the "Kondo cloud" of electrons within the leads and not in the QD. Copyright 2004 The American Physical Society

Controlled dephasing of a quantum dot in the Kondo regime / Avinun Kalish, M.; Heiblum, M.; Silva, Alessandro; Mahalu, D.; Umansky, V.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 92:15(2004), pp. 156801.1-156801.4. [10.1103/PhysRevLett.92.156801]

Controlled dephasing of a quantum dot in the Kondo regime

Silva, Alessandro;
2004-01-01

Abstract

Kondo correlation in a spin polarized quantum dot (QD) results from the dynamical formation of a spin singlet between the dot's net spin and a Kondo cloud of electrons in the leads, leading to enhanced coherent transport through the QD. We demonstrate here significant dephasing of such transport by coupling the QD and its leads to potential fluctuations in a nearby "potential detector." The qualitative dephasing is similar to that of a QD in the Coulomb blockade regime in spite of the fact that the mechanism of transport is quite different. A much stronger than expected suppression of coherent transport is measured, suggesting that dephasing is induced mostly in the "Kondo cloud" of electrons within the leads and not in the QD. Copyright 2004 The American Physical Society
2004
92
15
1
4
156801
https://arxiv.org/abs/cond-mat/0309230
http://cdsads.u-strasbg.fr/abs/2004PhRvL..92o6801A
Avinun Kalish, M.; Heiblum, M.; Silva, Alessandro; Mahalu, D.; Umansky, V.
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.92.156801.pdf

non disponibili

Tipologia: Versione Editoriale (PDF)
Licenza: Non specificato
Dimensione 245.89 kB
Formato Adobe PDF
245.89 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/17355
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 36
  • ???jsp.display-item.citation.isi??? 39
social impact