Jukub Luczak, Bogdan R. Bulka
We show influence of electric field and magnetic flux on spin entanglement in
an artificial triangular molecule build of coherently coupled quantum dots. In
a subspace of doublet states an explicit relation of concurrence with spin
correlation functions and chirality is presented. The electric field modifies
super-exchange correlations, shifts many-electron levels (the Stark effect) as
well as changes spin correlations. For some specific orientation of the
electric field one can observe monogamy, for which one of the spins is
separated from two others. Moreover, the Stark effect manifests itself in
different spin entanglement for small and strong electric fields. A role of
magnetic flux is opposite, it leads to circulation of spin supercurrents and
spin delocalization.
View original:
http://arxiv.org/abs/1202.1947
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