2017/09/30 by Leifeng Zhang, Yanming Che, Jibiao Wang +1
Materials Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Curse of dimensionality #Electronic and Structural Properties of Oxides #Fermi Gamma-ray Space Telescope #Fermi gas #Fermi surface #Optical lattice #Pairing #Pseudogap #Quantum many-body systems #Superfluidity #cond-mat.quant-gas #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1038/s41598-017-13321-3
published as ScIentIfIc REPORts 7, 12948 (2017) · main article + supplementary information, 6+1 pages, 7+2 color figures
arxiv created 2017/09/30 · openalex publication_date 2017/10/05 · arxiv updated 2017/10/12 · openalex created_date 2017/10/20 · openalex updated_date 2026/08/05
Abstract Atomic Fermi gases have been an ideal platform for simulating conventional and engineering exotic physical systems owing to their multiple tunable control parameters. Here we investigate the effects of mixed dimensionality on the superfluid and pairing phenomena of a two-component ultracold atomic Fermi gas with a short-range pairing interaction, while one component is confined on a one-dimensional (1D) optical lattice whereas the other is in a homogeneous 3D continuum. We study the phase diagram and the pseudogap phenomena throughout the entire BCS-BEC crossover, using a pairing fluctuation theory. We find that the effective dimensionality of the non-interacting lattice component can evolve from quasi-3D to quasi-1D, leading to strong Fermi surface mismatch. Upon pairing, the system becomes effectively quasi-two dimensional in the BEC regime. The behavior of T c bears similarity to that of a regular 3D population imbalanced Fermi gas, but with a more drastic departure from the regular 3D balanced case, featuring both intermediate temperature superfluidity and possible pair density wave ground state. Unlike a simple 1D optical lattice case, T c in the mixed dimensions has a constant BEC asymptote.