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

摘要

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.