Controlled dephasing of a quantum dot: From coherent to sequential tunneling

Daniel Rohrlich, Oren Zarchin, Moty Heiblum, Diana Mahalu, Vladimir Umansky

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Resonant tunneling through two identical potential barriers renders them transparent, as particle trajectories interfere coherently. Here we realize resonant tunneling in a quantum dot (QD), and show that detection of electron trajectories renders the dot nearly insulating. Measurements were made in the integer quantum Hall regime, with the tunneling electrons in an inner edge channel coupled to detector electrons in a neighboring outer channel, which was partitioned. Quantitative analysis indicates that just a few detector electrons completely dephase the QD.

Original languageEnglish
Article number096803
JournalPhysical Review Letters
Volume98
Issue number9
DOIs
StatePublished - 1 Mar 2007

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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