Electron localization and entanglement in a two-electron quantum dot

Details Electron localization and entanglement in a two-electron quantum dot Electron localization and entanglement in a two-electron quantum dot

2005-01-25

arxiv.org/abs/cond-mat/0501612v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Parts of the text were rewritten in order to enhance the clarity of presentation. Figure 2 was revised. REVTEX4. 5 pages with

Scientific paper

Calculations for two electrons in an elliptic quantum dot, using symmetry breaking at the unrestricted Hartree-Fock level and subsequent restoration of the broken parity via projection techniques, show that the electrons can localize and form a molecular dimer, described by a Heitler-London-type wave function. The calculated singlet-triplet splitting (J) as a function of the magnetic field (B) agrees with cotunneling measurements. Knowledge of the dot shape and of J(B) allows determination of the degree of entanglement in the ground state of the dot, which is of interest for the implementation of quantum logic gates. The theoretical value agrees with the experimental estimates.

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