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Physica E Low-dimensional Systems and Nanostructures

Control of electronic and optical properties of a laser dressed double quantum dot molecule by lateral electric field

Manuk G. Barseghyan, Vram Mughnetsyan, H.M. Baghramyan, Fatih Ungan, Laura Milena Pérez, D. Laroze

Published Aug 15, 2020• 14 citations
Publisher
DOI
10.1016/j.physe.2020.114362

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We study effects of spin-orbit coupling and electron-electron correlation, which can be electrically tuned, on the singlet-triplet entanglement in double lateral quantum dots charged with two electrons. We have found that the magnetic character of a double-dot system can be changed from diamagnetic to paramagnetic, only by adjusting the strength of spin-orbit coupling. Coulomb interaction leads to an unusual singlet-triplet energy splitting, accompanied by a shift of this transition energy to the lower magnetic field side in the energy spectrum.