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8 papers
An analytical study of resonant transport of Bose-Einstein condensates
K. Rapedius, D. Witthaut, H. J. Korsch
We study the stationary nonlinear Schrödinger equation, or Gross-Pitaevskii equation, for a one--dimensional finite square well potential. By neglecting the mean--field interaction…
Mean-field dynamics of a Bose-Einstein condensate in a time-dependent triple-well trap: Nonlinear eigenstates, Landau-Zener models and STIRAP
E. M. Graefe, H. J. Korsch, D. Witthaut
We investigate the dynamics of a Bose--Einstein condensate (BEC) in a triple-well trap in a three-level approximation. The inter-atomic interactions are taken into account in a mea…
Criticality for branching processes in random environment
V. I. Afanasyev, J. Geiger, G. Kersting +1
We study branching processes in an i.i.d. random environment, where the associated random walk is of the oscillating type. This class of processes generalizes the classical notion…
Non-Abelian gauge potentials for ultra-cold atoms with degenerate dark states
J. Ruseckas, G. Juzeliunas, P. Oehberg +1
We show that the adiabatic motion of ultra-cold, multi-level atoms in spatially varying laser fields can give rise to effective non-Abelian gauge fields if degenerate adiabatic eig…
Long-range interactions and entanglement of slow single-photon pulses
Inbal Friedler, David Petrosyan, Michael Fleischhauer +1
We show that very large nonlocal nonlinear interactions between pairs of colliding slow-light pulses can be realized in atomic vapors in the regime of electromagnetically induced t…
Collisional and thermal ionization of sodium Rydberg atoms I. Experiment for nS and nD atoms with n=8-20
I. I. Ryabtsev, D. B. Tretyakov, I. I. Beterov +3
Collisional and thermal ionization of sodium nS and nD Rydberg atoms with n=8-20 has been studied. The experiments were performed using a two-step pulsed laser excitation in an eff…