ComplexFreeStencil

This operator is designed to provide efficient methods for calculations involving a structured free operator (single particle symmetry sector of a fermionic Hilbert space). A free operator which can be written as a stencil assumes the general form $\sum_{s}\sum_{n=0}^N \alpha_{n}c_{s}^{\dagger}c_{s+\delta_n}$ where $\delta_n$are displacement vectors, $s$ are lattice position vectors, the $\alpha_n$ are position independent coefficients and $N$ is the number of such coefficients. To construct a stencil, the above parameters must be passed explicitly, together with information about the lattice dimensions and the boundary conditions. For more details, please see the operator_free factory.

Symbols

Name	Description
=	Assignment operator for the free stencil.