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- W2085956920 abstract "We describe repulsively interacting Bose-Einstein condensates in spatially correlated disorder potentials of arbitrary dimension. The first effect of disorder is to deform the mean-field condensate. The second is that the quantum excitation spectrum and condensate population are affected. By a saddle-point expansion of the many-body Hamiltonian around the deformed mean-field ground state, we derive the fundamental quadratic Hamiltonian of quantum fluctuations. Importantly, a basis is used such that excitations are orthogonal to the deformed condensate. Via Bogoliubov-Nambu perturbation theory, we compute the effective excitation dispersion, including mean free paths and localization lengths. Corrections to the speed of sound and average density of states are calculated, due to correlated disorder in arbitrary dimensions, extending to the case of weak lattice potentials." @default.
- W2085956920 created "2016-06-24" @default.
- W2085956920 creator A5002800744 @default.
- W2085956920 creator A5005143384 @default.
- W2085956920 date "2011-06-23" @default.
- W2085956920 modified "2023-10-03" @default.
- W2085956920 title "Bogoliubov excitations of disordered Bose-Einstein condensates" @default.
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- W2085956920 doi "https://doi.org/10.1103/physreva.83.063629" @default.
- W2085956920 hasPublicationYear "2011" @default.
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