Dephasing and the Orthogonality Catastrophe in Tunneling through a Quantum Dot: The “Which Path?” Interferometer

I. L. Aleiner, Ned S. Wingreen, Yigal Meir

Research output: Contribution to journalArticle

155 Scopus citations

Abstract

The “Which Path?” interferometer consists of an Aharonov-Bohm ring with a quantum dot (QD) built in one of its arms, and an additional quantum point contact (QPC) located close to the QD. The transmission coefficient of the QPC depends on the charge state of the QD. Hence the point contact acts as a controllable measurement device for which path an electron takes through the ring. We calculate the suppression of the Aharonov-Bohm oscillations which is caused by both measurement dephasing and the orthogonality catastrophe, i.e., respectively, by real and virtual electron-hole pair creation at the QPC.

Original languageEnglish (US)
Pages (from-to)3740-3743
Number of pages4
JournalPhysical review letters
Volume79
Issue number19
DOIs
StatePublished - Nov 10 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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