Macroscopic random Paschen-Back effect in ultracold atomic gases

Abstract

We consider spin- and density-related properties of single-particle states in a one-dimensional system with random spin-orbit coupling. We show that the presence of an additional Zeeman field $\Delta$ induces both nonlinear spin polarization and delocalization of states localized at $\Delta =0$, corresponding to a random macroscopic analogue of the Paschen-Back effect. While the conventional Paschen-Back effect corresponds to a saturated $\Delta -$dependence of the spin polarization, here the gradual suppression of the spin-orbit coupling effects by the Zeeman field is responsible both for the spin saturation and delocalization of the particles.

arXiv comment8 pages, 7 figures

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• The Dirac paradox in 1+1 dimensions and its realization with spin-orbit coupled nanowires
• Spin-dependent localization of spin-orbit and Rabi-coupled Bose-Einstein condensates in a random potential
• Resonant reflection of interacting electrons from an impurity in a quantum wire: interplay of Zeeman and spin-orbit effects
• Confinement versus interface bound states in spin-orbit coupled nanowires
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