Hi Khalid, Are you using exact diagonalization, or DMRG? At the present, it hasn't been implemented in the DMRG code. Saludos, <ADRIAN> khalid hassan wrote:

Can alps can calculate the current correlation function for the fermionic hubbard model model for say two site. I have been using alps to calculate cahrge coorelation function

the charge correlation function is

< n_i n_j > = < c_i^+ c_i c_i^+ c_i >

where as the current correlation function is

< j_i j_j > = < c_i^+ c_j c_k^+ c_l >

see the changing indexes.

If it is possible then send me the program statement

Best regards

Khalid Loane