Controlled preparation and detection of d-wave superfluidity in two-dimensional optical superlatticesA. M. Rey1, 2, R. Sensarma1, S. Fölling2, M. Greiner2, E. Demler2 and M. D. Lukin2
1 JILA and University of Colorado, Department of Physics, University of Colorado - Boulder, CO 80309, USA
2 Physics Department, Harvard University - Cambridge, MA, 02138, USA
received 21 August 2009; accepted in final form 12 September 2009; published September 2009
published online 28 September 2009
d-wave Cooper pairs are believed to be the key for understanding the phenomenon of high-temperature superconductivity in cuprates. These superconductors are an example of the emergence of strong pairing in systems with purely repulsive interactions, similar to superfluid helium 3 and the newly discovered iron oxypnictides. Despite intense studies, there is currently no consensus as to what causes the formation of d-wave Cooper pairs in these materials. Here we propose a novel experimental scheme in which recently demonstrated methods for realizing optical lattices and superlattices are combined to create and to detect, in a controlled way, ultracold-atom d-wave Cooper pairs. Our scheme starts from arrays of isolated plaquettes which incorporate the required d-wave correlations on a short length scale. By tuning the parameters of the potentials, these plaquettes can be coupled to achieve long-range d-wave superfluid correlations, finally arriving at the generic Hubbard model.
03.75.Ss - Degenerate Fermi gases.
37.10.Jk - Atoms in optical lattices.
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).
© EPLA 2009