2018/05/31 by Kevin Slagle, Yong Baek Kim
Materials Science · Physics and Astronomy · #BCS theory #Cooper pair #Degenerate energy levels #Fermion #Iron-based superconductors research #Lattice (music) #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Simple (philosophy) #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.21468/scipostphys.6.2.016
published as SciPost Phys. 6, 016 (2019) · 12+12 pages; 3 figures; v5 is a major revision with new additions: a conductor-dielectric-conductor trilayer interpretation, an elaborated introduction, figures 1 and 2, and sections 4.3.1 and 5.2
openalex created_date 2018/08/22 · openalex publication_date 2019/02/01 · arxiv created 2019/02/10 · arxiv updated 2019/02/12 · openalex updated_date 2026/08/05
Motivated by a scarcity of simple and analytically tractable models of superconductivity from strong repulsive interactions, we introduce a simple tight-binding lattice model of fermions with repulsive interactions that exhibits unconventional superconductivity (beyond BCS theory). The model resembles an idealized trilayer. The Cooper pair consists of electrons on opposite sides of the dielectric, which mediates the attraction. In the strong coupling limit, we use degenerate perturbation theory to show that the model reduces to a superconducting hard-core Bose-Hubbard model. Above the superconducting critical temperature, an analog of pseudo-gap physics results where the fermions remain Cooper paired with a large single-particle energy gap.