Quantum phases of quadrupolar fermi gases in optical lattices Journal Article

Author(s): Bhongale, Satyan G; Mathey, Ludwig; Zhao, Erhai; Yelin, Susanne F; Lemeshko, Mikhail P
Article Title: Quantum phases of quadrupolar fermi gases in optical lattices
Abstract: We introduce a new platform for quantum simulation of many-body systems based on nonspherical atoms or molecules with zero dipole moments but possessing a significant value of electric quadrupole moments. We consider a quadrupolar Fermi gas trapped in a 2D square optical lattice, and show that the peculiar symmetry and broad tunability of the quadrupole-quadrupole interaction results in a rich phase diagram encompassing unconventional BCS and charge density wave phases, and opens up a perspective to create a topological superfluid. Quadrupolar species, such as metastable alkaline-earth atoms and homonuclear molecules, are stable against chemical reactions and collapse and are readily available in experiment at high densities.
Keywords: Alkaline-earth atoms; Charge-density-wave phasis; Electric quadrupole moment; High density; Many-body systems; Non-Spherical; Quantum phasis; Quantum simulations
Journal Title: Physical Review Letters
Volume: 110
Issue 15
ISSN: 1079-7114
Publisher: American Physical Society  
Date Published: 2013-04-08
Start Page: Article number: 155301
DOI: 10.1103/PhysRevLett.110.155301
Open access: yes (repository)