Philipp Heinen

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

We compute from first principles the dispersion relation $ω(k)$ of a dipolar Bose gas of erbium atoms close to the roton instability by employing the Complex Langevin (CL) algorithm. Other than the path integral Monte Carlo algorithm, which samples the quantum mechanical path int...