Spin-charge separation in two-component Bose-gases

TL;DR

This paper demonstrates that spin-charge separation, a hallmark of 1D electronic systems, can be observed in two-component bosonic ultracold gases, providing a new platform for studying strong correlations.

Contribution

It shows that spin-charge separation can be realized in bosonic systems near phase separation, with detailed real-time evolution and spectral function analysis.

Findings

Spin and charge velocities can be tuned across parameters.

Spin-charge separation persists near phase separation.

Suitable conditions for experimental observation are identified.

Abstract

We show that one of the key characteristics of interacting one-dimensional electronic quantum systems, the separation of spin and charge, can be observed in a two-component system of bosonic ultracold atoms even close to a competing phase separation regime. To this purpose we determine the real-time evolution of a single particle excitation and the single-particle spectral function using density-matrix renormalization group techniques. Due to efficient bosonic cooling and good tunability this setup exhibits very good conditions for observing this strong correlation effect. In anticipation of experimental realizations we calculate the velocities for spin and charge perturbations for a wide range of parameters.