my question about current correlation function with fulldiag and sparsediag remains unanswered
--- On Fri, 2/27/09, comp-phys-alps-users-request(a)phys.ethz.ch <comp-phys-alps-users-request(a)phys.ethz.ch> wrote:
> From: comp-phys-alps-users-request(a)phys.ethz.ch <comp-phys-alps-users-request(a)phys.ethz.ch>
> Subject: Comp-phys-alps-users Digest, Vol 35, Issue 8
> To: comp-phys-alps-users(a)phys.ethz.ch
> Date: Friday, February 27, 2009, 4:00 PM
> Send Comp-phys-alps-users mailing
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> 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(a)yahoo.com>
> Subject: [ALPS-users] current correlation function for
> fermionic
> hubbard model
> To: comp-phys-alps-users(a)phys.ethz.ch
> Message-ID: <826945.64034.qm(a)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(a)kitp.ucsb.edu>
> Subject: Re: [ALPS-users] current correlation function for
> fermionic
> hubbard model
> To: comp-phys-alps-users(a)phys.ethz.ch
> Message-ID: <49A71559.80403(a)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(a)yahoo.com>
> Subject: [ALPS-users] current correlation function for
> fermionic
> hubbard model using
> alps
> To: comp-phys-alps-users(a)phys.ethz.ch
> Message-ID: <976367.6290.qm(a)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
> ***************************************************
>
Hi Dear,
>
> Thank you very much for your consideration. yes my model mixes states
> with different Sz.
> let me know DMRG works with complex vectors or not? and Can I change
> the basis which DMRG works in it?
>
> Thanks a lot
> Mohammad.
On Mon, Mar 2, 2009 at 2:30 PM,
<comp-phys-alps-users-request(a)phys.ethz.ch>wrote:
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> Today's Topics:
>
> 1. Operator difinition (zhian asadzadeh)
> 2. Re: Operator difinition (Adrian E. Feiguin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 1 Mar 2009 15:37:58 +0330
> From: zhian asadzadeh <zhian.asadzadeh(a)gmail.com>
> Subject: [ALPS-users] Operator difinition
> To: comp-phys-alps-users(a)phys.ethz.ch
> Message-ID:
> <89e5d6760903010407m44b1729raa91afa47e962e18(a)mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi Dear,
>
> Thank you very much for your consideration. yes my model mixes states with
> different Sz.
> let me know DMRG works with complex vectors or not? and Can I change the
> basis which DMRG works in it?
>
> Thanks a lot
> Mohammad.
>
> On Sun, Mar 1, 2009 at 2:30 PM,
> <comp-phys-alps-users-request(a)phys.ethz.ch>wrote:
>
> > Send Comp-phys-alps-users mailing list submissions to
> > comp-phys-alps-users(a)phys.ethz.ch
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> > or, via email, send a message with subject or body 'help' to
> > comp-phys-alps-users-request(a)phys.ethz.ch
> >
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> >
> > 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. Operator definition (zhian asadzadeh)
> > 2. Re: Operator definition (Adrian E. Feiguin)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sat, 28 Feb 2009 15:11:34 +0330
> > From: zhian asadzadeh <zhian.asadzadeh(a)gmail.com>
> > Subject: [ALPS-users] Operator definition
> > To: comp-phys-alps-users(a)phys.ethz.ch
> > Message-ID:
> > <89e5d6760902280341r7ca16b5fm506e562c4f043c64(a)mail.gmail.com>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Hi All,
> >
> > I am using DMRG for my problem, I need to calculate expectation value of
> Y
> > component of Spin operator (Sy) , As a result, I need to define it in the
> > model.xml file. How I can define it? I tried with
> > Sy(i)=1/(2*sqrt(-1))*(Splus(i)-Sminus(i)), but I got incorrect results.
> I
> > will be very appreciate if someone could help me?
> >
> > Thank you very much,
> > Mohammad.
> >
Hi Dear,
Thank you very much for your consideration. yes my model mixes states with
different Sz.
let me know DMRG works with complex vectors or not? and Can I change the
basis which DMRG works in it?
Thanks a lot
Mohammad.
On Sun, Mar 1, 2009 at 2:30 PM,
<comp-phys-alps-users-request(a)phys.ethz.ch>wrote:
> Send Comp-phys-alps-users mailing list submissions to
> comp-phys-alps-users(a)phys.ethz.ch
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>
> 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. Operator definition (zhian asadzadeh)
> 2. Re: Operator definition (Adrian E. Feiguin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 28 Feb 2009 15:11:34 +0330
> From: zhian asadzadeh <zhian.asadzadeh(a)gmail.com>
> Subject: [ALPS-users] Operator definition
> To: comp-phys-alps-users(a)phys.ethz.ch
> Message-ID:
> <89e5d6760902280341r7ca16b5fm506e562c4f043c64(a)mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi All,
>
> I am using DMRG for my problem, I need to calculate expectation value of Y
> component of Spin operator (Sy) , As a result, I need to define it in the
> model.xml file. How I can define it? I tried with
> Sy(i)=1/(2*sqrt(-1))*(Splus(i)-Sminus(i)), but I got incorrect results. I
> will be very appreciate if someone could help me?
>
> Thank you very much,
> Mohammad.
>