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Physikalisches Institut, Universität Bonn, Nussallee 12, D-53115 Bonn, Germany We have implemented a completely object oriented program for generating series expansions for quantum lattice models. A special effort was made in programming easy to use data structures for the underlying clusters which include efficient cluster generation and subcluster enumeration. The algorithm was designed to optimize memory allocation in generating ground state expansions, operator expansions and effective hamiltonians, thus allowing to calculate high order expansions. A primary goal of the implementation was to keep the general applicability of series expansions in the studies of quantum lattice problems. The package therefore makes no assumptions about the dimension of the underlying problem nor the type of lattice. |
| Simon Trebst Last modified: Sat May 22 14:22:06 MET DST 1999 |  |