ORDER VIA NONLINEARITY IN RANDOMLY CONFINED BOSE GASES
Robert GrahamUniversität Duisburg-Essen, Campus Duisburg, Fachbereich Physik, Lotharstraße 1, 47048 Duisburg, GermanyAxel PelsterUniversität Duisburg-Essen, Campus Duisburg, Fachbereich Physik, Lotharstraße 1, 47048 Duisburg, Germany
2009en
ABI
Abstract
A Hartree–Fock mean-field theory of a weakly interacting Bose-gas in a quenched white noise disorder potential is presented. A direct continuous transition from the normal gas to a localized Bose-glass phase is found which has localized short-lived excitations with a gapless density of states and vanishing superfluid density. The critical temperature of this transition is as for an ideal gas undergoing Bose–Einstein condensation. Increasing the particle-number density a first-order transition from the localized state to a superfluid phase perturbed by disorder is found. At intermediate number densities both phases can coexist.
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