title: Universal Fermi gases in mixed dimensions.
abstract: We investigate a two-species Fermi gas in which one species is confined in a two-dimensional plane (2D) or one-dimensional line (1D) while the other is free in the three-dimensional space (3D). We discuss the realization of such a system with the interspecies interaction tuned to resonance. When the mass ratio is in the range 0.0351<m_(2D)/m_(3D)<6.35 for the 2D-3D mixture or 0.006 46<m_(1D)/m_(3D)<2.06 for the 1D-3D mixture, the resulting system is stable against the Efimov effect and has universal properties. We calculate key quantities in the many-body phase diagram. Other possible scale-invariant systems with short-range few-body interactions are also elucidated.
authors.affiliation: Institute for Nuclear Theory, University of Washington, Seattle, WA 98195-1550, USA.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nishida
authors.forename: Shina
authors.initials: S
authors.lastname: Tan