Volume 88, Number 3, November 2009
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||02 November 2009|
Strongly interacting two-dimensional Dirac fermions
Institute for Theoretical Physics, Utrecht University - Leuvenlaan 4, 3584 CE Utrecht, The Netherlands, EU
2 Institut für Laser-Physik, Universität Hamburg - Luruper Chaussee 149, 22761 Hamburg, Germany, EU
Corresponding author: email@example.com
Accepted: 14 October 2009
We show how strongly interacting two-dimensional Dirac fermions can be realized with ultracold atoms in a two-dimensional optical square lattice with an experimentally realistic, inherent gauge field, which breaks time reversal and inversion symmetries. We find remarkable phenomena in a temperature range around a tenth of the Fermi temperature, accessible with present experimental techniques: at zero chemical potential, besides a conventional s-wave superconducting phase, unconventional superconductivity with non-local bond pairing arises. In a temperature vs. doping phase diagram, the unconventional superconducting phase exhibits a dome structure, reminiscent of the phase diagram for high-temperature superconductors and heavy fermions.
PACS: 67.85.Pq – Mixtures of Bose and Fermi gases / 37.10.Jk – Atoms in optical lattices / 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EPLA, 2009
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