title: Nonlinear elimination of spin-exchange relaxation of high magnetic moments.
abstract: Relaxation of the Larmor magnetic moment by spin-exchange collisions has been shown to diminish for high alkali densities, resulting from the linear part of the collisional interaction. In contrast, we demonstrate both experimentally and theoretically the elimination of spin-exchange relaxation of high magnetic moments (birefringence) in alkali vapor. This elimination originates from the nonlinear part of the spin-exchange interaction, as a scattering process of the Larmor magnetic moment. We find counterintuitively that the threshold magnetic field is the same as in the Larmor case, despite the fact that the precession frequency is twice as large.
authors.affiliation: Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
authors.forename: Or
authors.initials: O
authors.lastname: Katz
authors.forename: Mark
authors.initials: M
authors.lastname: Dikopoltsev
authors.forename: Or
authors.initials: O
authors.lastname: Peleg
authors.forename: Moshe
authors.initials: M
authors.lastname: Shuker
authors.forename: Jeff
authors.initials: J
authors.lastname: Steinhauer
authors.forename: Nadav
authors.initials: N
authors.lastname: Katz