1212.2947 (Bo Xiong et al.)

Interaction-induced coherence among polar bosons stored in triple-well
potentials    [PDF]

Bo Xiong, Uwe R. Fischer

We study first-order spatial coherence for interacting polar bosons trapped in triple-well potentials. It is argued that besides the well-known coherence-producing couplings related to tunneling between the sites, there exists coherence based solely on intersite interactions, which prevails between the outer sites of the triple well when their total filling is odd. We find that it originates from the superposition of two degenerate many-body states in symmetric triple wells, and demonstrate its robustness against perturbations due to various tunneling mechanisms and pair exchange.

View original: http://arxiv.org/abs/1212.2947