title: Hanle effect driven by weak localization.
abstract: The influence of weak localization on the Hanle effect in a two-dimensional system with a spin-split spectrum is considered. We show that weak localization drastically changes the dependence of a stationary spin polarization S on an external magnetic field B. In particular, the nonanalytic dependence of S on B is predicted for III-V-based quantum wells grown in the [110] direction and for the [100]-grown quantum wells having equal strengths of Dresselhaus and Bychkov-Rashba spin-orbit coupling. It is shown that in a weakly localized regime the components of S are discontinuous at B = 0. At low B, the magnetic field-induced rotation of the stationary polarization is determined by quantum interference effects. This implies that the Hanle effect in such systems is totally driven by weak localization.
authors.affiliation: A. F. Ioffe Physical-Technical Institute, 26 Polytechnicheskaya Street, Saint Petersburg, 194021, Russia.
authors.forename: I S
authors.initials: IS
authors.lastname: Lyubinskiy
authors.forename: V Yu
authors.initials: VY
authors.lastname: Kachorovskii