Composite boson signature in the interference pattern of atomic dimer condensates

TL;DR

This paper predicts high frequency modes in the interference pattern of fermionic-atom dimer condensates, revealing their composite nature through many-body effects and Pauli blocking, with potential experimental observation in optical lattices.

Contribution

It analytically derives the correlation function and visualizes many-body effects with Shiva diagrams, identifying signatures of the composite boson nature in interference patterns.

Findings

High frequency modes are predicted in dimer condensate interference patterns.

Pauli blocking leads to dimer granularity observable in the modes.

Conditions for experimental detection using optical lattices are identified.

Abstract

We predict the existence of high frequency modes in the interference pattern of two condensates made of fermionic-atom dimers. These modes, which result from fermion exchanges between condensates, constitute a striking signature of the dimer composite nature. From the 2-coboson spatial correlation function, that we derive analytically, and the Shiva diagrams that visualize many-body effects specific to composite bosons, we identify the physical origin of these high frequency modes and determine the conditions to see them experimentally by using bound fermionic-atom pairs trapped on optical lattice sites. The dimer granularity which appears in these modes comes from Pauli blocking that prevents two dimers to be located at the same lattice site.