Strongly Interacting Two-Dimensional Dirac Fermions

Details Strongly Interacting Two-Dimensional Dirac Fermions Strongly Interacting Two-Dimensional Dirac Fermions

2009-05-08

arxiv.org/abs/0905.1281v2

EPL 88, 36001 (2009)

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

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 versus doping phase diagram, the unconventional superconducting phase exhibits a dome structure, reminiscent of the phase diagram for high-temperature superconductors and heavy fermions.

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