Resonant dynamics in boson-fermion mixtures

TL;DR

This paper investigates the short-term resonant oscillations in a dilute boson-fermion mixture near a Feshbach resonance, revealing potential observable dynamics in specific atomic mixtures before collapse or phase separation occurs.

Contribution

It introduces a model describing resonant oscillations in boson-fermion mixtures near Feshbach resonances, highlighting their detectability in $^{40}$K-$^{87}$Rb systems.

Findings

Oscillations dominate the dynamics before collapse or phase separation.

Predicted oscillations are observable in $^{40}$K-$^{87}$Rb mixtures.

Model applies to dilute atomic mixtures near Feshbach resonances.

Abstract

The time evolution of a dilute atomic boson-fermion mixture is studied at zero temperature, when the external magnetic field is brought close to a interspecies Feshbach resonance. On short time scales we find that before a collapse or phase separation of the mixture can occur, oscillations between fermionic atoms and heteronuclear molecules dominate the dynamics. Applying the model presented here to a trapped mixture of $^{40}$K-$^{87}$Rb atoms, we find that the predicted oscillations can be revealed in degenerate mixtures of these atoms.