Double quantum dot with two electrons: Singlet-triplet transitions

O. Entin-Wohlman*, Amnon Aharony, Y. Levinson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The magnetic character of the ground state of two electrons on a double quantum dot, connected in series to left and right single-channel leads, is considered. By solving exactly for the spectrum of the two interacting electrons, it is found that the coupling to the continuum of propagating states on the leads, in conjunction with the electron-electron interactions, may result in a delocalization of the bound state of the two electrons. This, in turn, reduces significantly the range of the Coulomb interaction parameters over which singlet-triplet transitions can be realized. It is also found that the coupling to the leads favors the singlet ground state.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number8
DOIs
StatePublished - 2001

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