my question about current correlation function with fulldiag and sparsediag remains unanswered
--- On Fri, 2/27/09, comp-phys-alps-users-request@phys.ethz.ch comp-phys-alps-users-request@phys.ethz.ch wrote:
From: comp-phys-alps-users-request@phys.ethz.ch comp-phys-alps-users-request@phys.ethz.ch Subject: Comp-phys-alps-users Digest, Vol 35, Issue 8 To: comp-phys-alps-users@phys.ethz.ch Date: Friday, February 27, 2009, 4:00 PM Send Comp-phys-alps-users mailing list submissions to comp-phys-alps-users@phys.ethz.ch
To subscribe or unsubscribe via the World Wide Web, visit https://webmail.phys.ethz.ch/mailman/listinfo/comp-phys-alps-users or, via email, send a message with subject or body 'help' to comp-phys-alps-users-request@phys.ethz.ch
You can reach the person managing the list at comp-phys-alps-users-owner@phys.ethz.ch
When replying, please edit your Subject line so it is more specific than "Re: Contents of Comp-phys-alps-users digest..."
Today's Topics:
1. current correlation function for fermionic hubbard model (khalid hassan) 2. Re: current correlation function for fermionic hubbard model (Adrian E. Feiguin) 3. current correlation function for fermionic hubbard model using alps (khalid hassan)
Message: 1 Date: Thu, 26 Feb 2009 13:25:11 -0800 (PST) From: khalid hassan mkhloane@yahoo.com Subject: [ALPS-users] current correlation function for fermionic hubbard model To: comp-phys-alps-users@phys.ethz.ch Message-ID: 826945.64034.qm@web59410.mail.ac4.yahoo.com Content-Type: text/plain; charset=us-ascii
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
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
Message: 3 Date: Fri, 27 Feb 2009 01:28:00 -0800 (PST) From: khalid hassan mkhloane@yahoo.com Subject: [ALPS-users] current correlation function for fermionic hubbard model using alps To: comp-phys-alps-users@phys.ethz.ch Message-ID: 976367.6290.qm@web59408.mail.ac4.yahoo.com Content-Type: text/plain; charset=us-ascii
I am using alps for the calculation of charge correlation function for the fermionic hubbard model. Now I want to calculate the current correlation function.
the expression for the charge correlation function is
< n_i : n_j > = < c_i^+ c_i : c_j^+ c_j >
the expression for the current correlation function is
< j_i : j_j > = < c_i^+ c_j : c_k^+ c_l >
Notice the changing indices in the current expression.
If it is possible then please give the program statements doing this
Best Regards
Khalid Loane
End of Comp-phys-alps-users Digest, Vol 35, Issue 8