Ab initio Complex Langevin computation of the roton gap for a dipolar Bose condensate

Philipp Heinen, Wyatt Kirkby, Lauriane Chomaz +1

We compute from first principles the dispersion relation $\omega (k)$ of a dipolar Bose gas of erbium atoms close to the roton instability by employing the Complex Langevin (CL) algorith…