2017/01/31 by Junichi Okamoto, Ludwig Mathey, Wen-Min Huang
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fermion #Pairing #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Superconductivity #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.95.053633
published as Phys. Rev. A 95, 053633 (2017) · 10 pages, 10 figures
arxiv created 2017/05/26 · openalex publication_date 2017/05/26 · arxiv updated 2017/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the quantum phases of mixed-dimensional cold atom mixtures. In particular, we consider a mixture of a Fermi gas in a two-dimensional lattice, interacting with a bulk Fermi gas or a Bose-Einstein condensate in a three-dimensional lattice. The effective interaction of the two-dimensional system mediated by the bulk system is determined. We perform a functional renormalization group analysis, and demonstrate that by tuning the properties of the bulk system, a subtle competition of several superconducting orders can be controlled among s\ensuremath-wave, p\ensuremath-wave, d_x2\ensuremath-y2\ensuremath-wave, and g_xy(x2\ensuremath-y2)\ensuremath-wave pairing symmetries. Other instabilities such as a charge-density-wave order are also demonstrated to occur. In particular, we find that the critical temperature of the d\ensuremath-wave pairing induced by the next-nearest-neighbor interactions can be an order of magnitude larger than that of the same pairing induced by doping in the simple Hubbard model. We expect that by combining the nearest-neighbor interaction with the next-nearest-neighbor hopping (known to enhance d\ensuremath-wave pairing), an even higher critical temperature may be achieved.