March 2009 - Comp-phys-alps-users

current correlation function with fulldiag and sparsediag
by khalid hassan 02 Mar '09

02 Mar '09

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 > list submissions to > comp-phys-alps-users(a)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(a)phys.ethz.ch > > You can reach the person managing the list at > comp-phys-alps-users-owner(a)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(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 > *************************************************** >

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Operator difinition
by zhian asadzadeh 02 Mar '09

02 Mar '09

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: > Send Comp-phys-alps-users mailing list submissions to > comp-phys-alps-users(a)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(a)phys.ethz.ch > > You can reach the person managing the list at > comp-phys-alps-users-owner(a)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. 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 > > > > 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(a)phys.ethz.ch > > > > You can reach the person managing the list at > > comp-phys-alps-users-owner(a)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. 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. > >

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Operator difinition
by zhian asadzadeh 01 Mar '09

01 Mar '09

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 > > 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(a)phys.ethz.ch > > You can reach the person managing the list at > comp-phys-alps-users-owner(a)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. 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. >

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