We study interference effects in the dynamics of a spin-$\frac{1}{2}$ particle propagating in two dimensions in a disordered potential and subject to a generalized spin-orbit coupling. With the particle initially in a spin-polarized plane-wave state, in the short-time regime, before the spin and momentum distributions reach their steady states, we observe a transient backscattering peak offset from the exact backscattering direction, coexisting with a coherent backscattering dip. We present an intuitive explanation of this momentum offset using a non-Abelian gauge transformation. We also describe the full time evolution of the transient peak, from its buildup to its decay with a precise prediction of the dephasing time within a perturbative framework for multiple scattering. Our results can be applied to general spatially uniform SU(2) gauge fields, including the synthetic gauge field in ultracold atoms.

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• Cold atoms & matter waves
• Non-Abelian gauge theories
• Spin-orbit coupling
• Synthetic gauge fields
• Wave scattering
• Weak antilocalization
• Weak localization
• 2-dimensional systems
• Atomic gases
• Random & disordered media