Dynamical revivals of the paired superfluidity and counterflow superfluidity

TL;DR

This paper investigates the periodic collapse and revival of quantum coherence in two-species bosons in optical lattices, identifying paired and counterflow superfluidity through mean-field theory and exact diagonalization, and proposes methods for their detection.

Contribution

It introduces a dynamical approach to realize and detect paired and counterflow superfluidity in optical lattices, supported by theoretical analysis and exact diagonalization.

Findings

Quantum coherence exhibits periodic collapses and revivals.

Paired and counterflow superfluidity are identified and verified.

A dynamical method for implementation and detection is proposed.

Abstract

The quantum dynamics of two-species bosons in an optical lattice is studied within the mean-field theory. The quantum coherence experiences periodical collapses and revivals, which depends on the relative strength of the inter-and intra-species interactions. The paired superfluidity and the counterflow superfluidity are identified and are verified by exact diagonaliztion in the two-site Hubbard model. We suggest a dynamical method of implementation and detection for the paired superfluid and the counterflow superfluidity in the optical lattices.