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Regular version of the site

Article

Dynamic spin injection into a quantum well coupled to a s pin-split bound state

Physical Review B: Condensed Matter and Materials Physics. 2018. Vol. 97. P. 195445-1-195445-6.
Маслова Н., Рожанский И., Манцевич В., Arseyev P., Аверкиев Н., Lähderanta E.

We present a theoretical analysis of dynamic spin injection due to spin-dependent tunneling between a quantum
well (QW) and a bound state split in spin projection due to an exchange interaction or external magnetic field. We
focus on the impact of Coulomb correlations at the bound state on spin polarization and sheet density kinetics of
the charge carriers in the QW. The theoretical approach is based on kinetic equations for the electron occupation
numbers taking into account high order correlation functions for the bound state electrons. It is shown that the
on-site Coulomb repulsion leads to an enhanced dynamic spin polarization of the electrons in the QW and a delay
in the carriers tunneling into the bound state. The interplay of these two effects leads to nontrivial dependence
of the spin polarization degree, which can be probed experimentally using time-resolved photoluminescence
experiments. It is demonstrated that the influence of the Coulomb interactions can be controlled by adjusting the
relaxation rates. These findings open a new way of studying the Hubbard-like electron interactions experimentally.