188 citations · 663 across the 12 of their papers we have counts for
12 papers
Excitation spectra of many-body systems by linear response: General theory and applications to trapped condensates
Julian Grond, Alexej I. Streltsov, Axel U. J. Lode +3
We derive a general linear-response many-body theory capable of computing excitation spectra of trapped interacting bosonic systems, e.g., depleted and fragmented Bose-Einstein con…
Vibrational state inversion of a Bose-Einstein condensate: optimal control and state tomography
Robert Bücker, Tarik Berrada, Sandrine van Frank +6
We present theoretical and experimental results on high-fidelity transfer of a trapped Bose-Einstein condensate into its first vibrationally excited eigenstate. The excitation is d…
Dynamics of parametric matter wave amplification
Robert Bücker, Ulrich Hohenester, Tarik Berrada +7
We develop a model for parametric amplification, based on a density matrix approach, which naturally accounts for the peculiarities arising for matter waves: significant depletion…
Excitation spectra of fragmented condensates by linear response: General theory and application to a condensate in a double-well potential
Julian Grond, Alexej I. Streltsov, Ofir E. Alon +1
Linear response of simple (i.e., condensed) Bose-Einstein condensates is known to lead to the Bogoliubov- de Gennes equations. Here, we derive linear response for fragmented Bose-E…
Recursive formulation of the multiconfigurational time-dependent Hartree method for fermions, bosons and mixtures thereof in terms of one-body density operators
Ofir E. Alon, Alexej I. Streltsov, Kaspar Sakmann +3
The multiconfigurational time-dependent Hartree method (MCTDH) [Chem. Phys. Lett. {\bf 165}, 73 (1990); J. Chem. Phys. {\bf 97}, 3199 (1992)] is celebrating nowadays entering its t…
Shapiro effect in atomchip-based bosonic Josephson junctions
Julian Grond, Thomas Betz, Ulrich Hohenester +3
We analyze the emergence of Shapiro resonances in tunnel-coupled Bose-Einstein condensates, realizing a bosonic Josephson junction. Our analysis is based on an experimentally relev…