On Dec 13, 2011, at 8:39 PM, Volodymyr Derzhko wrote:
Dear Mr Troyer,
Thank you for your answer.
It needs memory for the sparse Hamiltonian matrix and a few vectors. In your specific example the Hilbert space size is 25 million elements. WHat is your model? a chain? or another lattice?
I know how to write it in the term of graph, i.e. without any translation symmetries. The elementary cell consists of two sites, but there are hopping elements to first-, second- and third-nearest neighbours. Moreover, in order to calculate thermodynamical quantities, I need to have degeneracy of energy level as well as its value, which is impossible in sparcediag.
If it has such long range hopping and no translational symmetry then this is too big for either of the codes and you need to write a program just for this model.
Matthias Troyer