2015/12/31 by Thomas Ayral, Olivier Parcollet · 2 citations
Physics and Astronomy · #Condensed matter physics #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum many-body systems #Quantum mechanics #Spin (aerodynamics) #Statistical physics #Theoretical physics #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.93.235124
published as Phys. Rev. B 93, 235124 (2016) · 29 pages, 14 figures
arxiv created 2016/03/31 · openalex publication_date 2016/06/14 · arxiv updated 2016/06/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Two important scenarios have been put forth to explain high-temperature superconductivity. One scenario emphasizes, following Philip W. Anderson, that for many high-Tc superconductors their undoped parent compounds are Mott insulators, with local physics playing a major role. Another scenario stresses instead the importance of spin fluctuations near a quantum critical point. In this work, the authors reconcile both viewpoints by constructing a functional of the Green's function of the electron (G), of the fluctuations (W) and of the vertex that couples the two (\mathrm\ensuremathΛ). In the approach presented by the authors, Mott physics as well as the charge and spin fluctuations are taken into account in the description of correlations. This is done at a computational cost comparable to that of the dynamical mean field theory, making the method suitable for multiorbital extensions.