2k citations · 5.7k across the 37 of their papers we have counts for
37 papers
Equation of motion truncation scheme based on partial orthogonalization
Francesco Catalano, Johan Nilsson
We introduce a general scheme to consistently truncate equations of motion for Green's functions. Our scheme is guaranteed to generate physical Green's functions with real excitati…
The Hubbard dimer within the Green's function equation of motion approach
Francesco Catalano, Johan Nilsson
We consider a formulation of the equation of motion technique for Green's function in which the unknown averages are computed by solving a linear system. This linear system appears…
Physics-inspired derivations of some algorithms for computing the permanent
Johan Nilsson
We provide physics-inspired derivations of a number of algorithms for computing the permanent of a matrix. In particular we formulate the computation of the permanent as a Grassman…
Substitution Rules for Higher-Dimensional Paperfolding Structures
Franz Gähler, Johan Nilsson
We present a general scheme how to construct a substitution rule for generating -dimensional analogues of the paperfolding structures. This substitution is proven to be primitiv…
Free fermion description of a paramagnetic Mott insulator
Johan Nilsson, Matteo Bazzanella
A scheme is presented that enables a description of a paramagnetic Mott insulator in terms of free fermions. The main idea is to view the physical fermions as a part of a multi-ban…
Non-Linear Methods in Strongly Correlated Electron Systems
Matteo Bazzanella, Johan Nilsson
We analyze the structure of the group of (local) non-linear canonical transformations that exist in a system with n fermionic modes. To perform our study we develop an alternative…