Persistent currents in Bose-Bose mixtures after an interspecies interaction quench

We study the persistent currents and interspecies entanglement generation in a Bose-Bose mixture formed by two atomic gases (hereafter labeled by the letters A and B) trapped in a one-dimensional ring lattice potential with an artificial gauge field after a sudden quench from zero to strong interactions between the two gases. Assuming that the strength of these interactions is much larger than the single species energies and that the gas A is initially in the Mott-insulator regime, we show that the current of the gas B is reduced with respect to its value prior the interaction quench. Averaging fast oscillations out, the relative decrease of this current is independent of the initial visibility and Peierls phase of the gas B and behaves quadratically with the visibility of the gas A. The second Renyi entropy of the reduced state measuring the amount of entanglement between the two gases is found to scale linearly with the number of sites and to be proportional to the relative decrease of the current.

Automated summary

This study investigates the persistent currents and interspecies entanglement generation in a Bose-Bose mixture formed by two atomic gases trapped in a one-dimensional ring lattice potential. The research shows that after a sudden quench to strong interactions between the two gases, the current of gas B decreases relative to its initial value and is quadratically related to the visibility of gas A. Additionally, the second Renyi entropy of the reduced state scales linearly with the number of sites and is proportional to the relative decrease of the current, measuring the amount of entanglement between the two gases.