Confinement-induced resonance with weak background interaction

摘要: We studied the scattering problem of two distinguishable atoms with unequal mass, where one atom (atom $\alpha$) is trapped in a quasi-one-dimensional (quasi-1D) tube and other $\beta$) localized by 3D harmonic trap. show that such system if $\alpha$ much heavier than $\beta$, confinement-induced resonance (CIR) can appear when $s$-wave length $a_s$ these smaller characteristic lengths (CLs) confinements, for either $a_s>0$ or $a_s<0$. This quite different from usual CIRs which occurs only comparable CL confinement. Moreover, we find are broad enough serve as tool control effective inter-atomic interaction. further mechanism via Born-Oppenheimer approximation. Our results be used realization strongly-interacting systems ultracold weak background interaction (i.e., small $a_s$), e.g., gases strong spin-dependent at zero magnetic fields.