Quantum solitons in spin-orbit-coupled Bose-Bose mixtures

Andrea Tononi (1, 2) , Yueming Wang (2, 3) , Luca Salasnich (2, 4)

1 LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques
2 Unipd - Università degli Studi di Padova = University of Padua
3 SXU - Shanxi University
4 INO - Istituto Nazionale di Ottica

Recent experimental and theoretical results show that weakly interacting atomic Bose-Bose mixtures with attractive interspecies interaction are stabilized by beyond-mean-field effects. Here we consider the peculiar properties of these systems in a strictly one-dimensional configuration, taking also into account the nontrivial role of spin-orbit and Rabi couplings. We show that when the value of inter-and intraspecies interaction strengths are such that mean-field contributions to the energy cancel, a self-bound bright soliton fully governed by quantum fluctuations exists. We derive the phase diagram of the phase transition between a single-peak soliton and a multipeak (striped) soliton, produced by the interplay between spin-orbit, Rabi couplings and beyond-mean-field effects, which also affect the breathing mode frequency of the atomic cloud. Finally, we prove that a phase imprinting of the single-peak soliton leads to a self-confined propagating solitary wave even in the presence of spin-orbit coupling.

Domaines: Physique [physics]

Andrea Tononi, Yueming Wang, Luca Salasnich. Quantum solitons in spin-orbit-coupled Bose-Bose mixtures. Physical Review A, 2019, 99 (6), pp.063618. ⟨10.1103/PhysRevA.99.063618⟩. ⟨hal-03920939⟩