Sparse Diagonalization (Lanczos)

Introduction

The sparsediag is an exact diagonalization program in ALPS, using the Lanczos algorithm of the IETL library to compute low-lying eigestates of the Hamiltonian. Hence, it can be used for computing ground-state properties of any model that can be defined using the ALPS libraries. The main limitation is one of size, i.e., memory and CPU time may become unacceptable at sizes where other, more specialized applications still work well.

Running a computation

is discussed in the sparsediag tutorial

Input parameters

In addition to the input parameters are explained here the sparsediag code takes the following parameter: