Localization and Delocalization of Ground States of Bose--Einstein Condensates Under Disorder

Abstract

This paper studies the localization behavior of Bose--Einstein condensates in disorder potentials, modeled by a Gross--Pitaevskii eigenvalue problem on a bounded interval. In the regime of weak particle interaction, we are able to quantify exponential localization of the ground state, depending on statistical parameters and the strength of the potential. Numerical studies further show delocalization if we leave the identified parameter range, which is in agreement with experimental data. These mathematical and numerical findings allow the prediction of physically relevant regimes where localization of ground states may be observed experimentally.