I am using it with exact diagonalization. If it is implemented for the exact diagonalization please give the program statement.

Message: 2 Date: Thu, 26 Feb 2009 14:19:05 -0800 From: "Adrian E. Feiguin" afeiguin@kitp.ucsb.edu Subject: Re: [ALPS-users] current correlation function for fermionic hubbard model To: comp-phys-alps-users@phys.ethz.ch Message-ID: 49A71559.80403@kitp.ucsb.edu Content-Type: text/plain; charset=ISO-8859-1; format=flowed

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