Ground State Energy of Mean-field Model of Interacting Bosons in Bernoulli Potential

Michael Bishop, Jan Wehr

Published 2012-12-06, updated 2012-12-27Version 3

This paper explores a system of interacting `soft core' bosons in the Gross-Pitaevskii mean-field approximation in a random Bernoulli potential. First, a condition for delocalization of the ground state wave function is proved which depends on the number of particles and interaction strength. Using this condition, asymptotics for ground state energy per particle are derived in the large system limit for small values of the coupling constant. Our methods directly describe the shape of the ground state in a given realization of the random potential.