2019/09/03 by Hong‐Chen Jiang, Hong-Chen Jiang, Shuai Chen +2 · 25 citations
Materials Science · Mathematics · Physics and Astronomy · #Adiabatic process #Condensed matter physics #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Fermi liquid theory #Ground state #Mathematics #Mott insulator #Organic and Molecular Conductors Research #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Sign (mathematics) #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.102.104512
published in Physical review. B./Physical review. B 102(10) (American Physical Society) · 8 pages, 5 figures
arxiv created 2019/09/03 · openalex created_date 2019/09/12 · openalex publication_date 2020/09/25 · arxiv updated 2020/09/30 · openalex updated_date 2026/08/05
The mechanism of superconductivity in a purely interacting electron system has been one of the most challenging issues in condensed matter physics. In the BCS theory, the Landau's Fermi liquid is the ground state of weakly interacting fermions dictated by the fermion sign structure, and the superconducting instability only occurs when an additional pairing force is added. By contrast, as shown by density matrix renormalization group calculation, a quasi-one-dimensional superconducting state (specifically a Luther-Emery state) is an intrinsic ground state of the t\ensuremath-J two-leg ladder and four-leg cylinder at finite doping. Such a Luther-Emery state with pairing can be directly turned into a Fermi-gas-like normal state without pairing by merely switching off the phase-string signs hidden in the model via two schemes, which reduce the sign structure to the trivial fermion signs associated with doped holes. It thus demonstrates a new pairing paradigm in a model-doped Mott insulator as due to the generic phase-string sign structure. Finally, as an example, the latter is explicitly shown to lead to a ``stringlike'' pairing force after adiabatically connecting to a strong anisotropic limit of the model.