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13 papers · 2 filters
Atom-molecule coherence in Bose gases
R. A. Duine, H. T. C. Stoof
In an atomic gas near a Feshbach resonance, the energy of two colliding atoms is close to the energy of a bound state, i.e., a molecular state, in a closed channel that is coupled…
Pair contact process with diffusion: field theory
Frederic van Wijland, Uwe C. Tauber, Olivier Deloubriere
This paper, which was concerned with a field-theoretic analysis of the PCPD by means of the renormalization group, has been withdrawn by the authors. We had found a nontrivial RG f…
Noisy Dynamics of a Vortex in a Partially Bose-Einstein Condensed Gas
R. A. Duine, B. W. A. Leurs, H. T. C. Stoof
We study the dynamics of a straight vortex line in a partially Bose-Einstein condensed atomic gas. Using a variational approach to the stochastic field equation that describes the…
Spontaneous squeezing of a vortex in an optical lattice
J. -P. Martikainen, H. T. C. Stoof
We study the equilibrium states of a vortex in a Bose-Einstein condensate in a one-dimensional optical lattice. We find that quantum effects can be important and that it is even po…
Quantum fluctuations of a vortex in an optical lattice
J. -P. Martikainen, H. T. C. Stoof
Using a variational ansatz for the wave function of the Bose-Einstein condensate, we develop a quantum theory of vortices and quadrupole modes in a one-dimensional optical lattice.…
Ultracold atoms in optical lattices
D. B. M. Dickerscheid, D. van Oosten, P. J. H. Denteneer +1
Bosonic atoms trapped in an optical lattice at very low temperatures, can be modeled by the Bose-Hubbard model. In this paper, we propose a slave-boson approach for dealing with th…