Impact Factor0.0

DOI number:10.1103/5lsf-kktm

Journal:Phys. Rev. A

Abstract:We present a comprehensive theoretical study of linear wave scattering from magnetic domain walls with varied twist angles Θ in spin-1/2 Bose-Einstein condensates (BECs). Using a gauge transformation, we show that scattering observables depend solely on the total twist Θ, independent of chirality. Within the Bogoliubov–de Gennes (BdG) framework, we develop a transfer-matrix method to compute reflection and transmission coefficients for incident phonons and free particles. Our results reveal a scattering threshold at the Zeeman energy 𝐸=ℏ⁢Ω0, separating a pure phonon regime from multichannel scattering involving both collective and single-particle excitations above threshold. Above a critical twist angle Θ𝑐, the effective spin rotation deviates from the imposed twist angle, leading to comb-like density modulations and Fano-like resonances below the threshold ℏ⁢Ω0. The transition probability between phonon and particle channels is strongly tunable with Θ<Θ𝑐, enhanced for odd multiples of 𝜋 but suppressed for even multiples. These findings establish twist-engineered domain walls as a versatile platform for controlling quantum transport, with implications for atomtronic devices and quantum simulation.

Volume:113

Page Number:043313

Translation or Not:no

Links to published journals:https://doi.org/10.1103/5lsf-kktm