Quantum dots with two electrons: Singlet-triplet transitions

Details Quantum dots with two electrons: Singlet-triplet transitions Quantum dots with two electrons: Singlet-triplet transitions

2001-03-07

arxiv.org/abs/cond-mat/0103160v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.085332

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.

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