The coherence of boson-fermion mixed system

摘要

In this paper, we investigate the quantum coherence of Bose-Fermi mixtures of ultracold dipolar particles trapped in a three-site Bose-Fermi-Hubbard model. We show that the interplay between the boson-boson on-site interaction, boson-fermion on-site interaction, and boson-fermion inter-site dipole-dipole interaction (DDI) results in interesting coherence characters. When boson-boson on-site interaction is present, the resonance character of coherence against both boson-fermion DDI and boson-fermion on-site interaction emerges, the coherence of the system can be enhanced at certain values of boson-fermion on-site interaction and boson-fermion DDI. DDI of fermion-fermion affects the coherence weak and the phase coherence decreases monotonically for all the values of fermion-fermion DDI. The obtained coherent characters are further confirmed within the variational analyzing of the ground state energy.