Comp-phys-alps-users

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1 participants
1248 discussions

11 Mar '09

I'm a Physic students of an University in Indonesia. I would like to learn more about ALPS for my reaserch. but I have some problems with my simulations. Please give me some step to regeister in ALPS community. Thankn's Selalu bersama teman-teman di Yahoo! Messenger. Tambahkan mereka dari email atau jaringan sosial Anda sekarang! http://id.messenger.yahoo.com/invite/

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clustered spin simulations
by Brian Keith 10 Mar '09

10 Mar '09

Hello, I am looking for help in simulating a depleted magnetic rectangle. Normally I would just introduce the depletion term and go but I need more control over where the spinless sites are located. Essentially I want to introduce a bias so that there is a greater chance of spinless sites to be placed next to each other. I want to promote clusters of spinless sites. I was looking through the tutorial to find out how to create lattices brute force to no avail. Is there an easy way to promote these clusters? Or is there at least a way to manually place the spinless sites throughout a lattice? thanks, Brian -- Brian Keith Dept. of Physics Clark University

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Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 36, Issue 5
by zhian asadzadeh 10 Mar '09

10 Mar '09

Hi Because you have 6 different spin you must use the following for your basis and in your parm file you must give them their values such local_S0=1/2, local_S1=1,local_S2=3,local_S4=5 and so on. and for J1=3, J2=4, J3=.. . <BASIS name="spin"> <SITEBASIS ref="spin"> <PARAMETER name="local_spin" value="local_S#"/> <PARAMETER name="local_S#" value="local_S"/> <PARAMETER name="local_S" value="1/2"/> </SITEBASIS> </BASIS> and for bond operators you must use: <BONDTERM source="i" target="j"> <PARAMETER name="J#" default="J"/> J#*exchange(i,j) </BONDTERM> in writing your lattice you must define 3 type edge. (I think it is easy use graph instead of lattice). Mohammad. On Tue, Mar 10, 2009 at 3:30 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. clustered spin simulations (Brian Keith) > 2. Question: model writing (Guilin Zhuang) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 9 Mar 2009 16:11:25 -0400 > From: Brian Keith <btronk(a)gmail.com> > Subject: [ALPS-users] clustered spin simulations > To: comp-phys-alps-users(a)phys.ethz.ch > Message-ID: > <53f922fd0903091311x44caf6a2v10cd77a6421a174c(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hello, > I am looking for help in simulating a depleted magnetic rectangle. > Normally I would just introduce the depletion term and go but I need more > control over where the spinless sites are located. Essentially I want to > introduce a bias so that there is a greater chance of spinless sites to be > placed next to each other. I want to promote clusters of spinless sites. I > was looking through the tutorial to find out how to create lattices brute > force to no avail. Is there an easy way to promote these clusters? Or is > there at least a way to manually place the spinless sites throughout a > lattice? > > thanks, Brian > > -- > Brian Keith > Dept. of Physics > Clark University >

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Question: model writing
by Guilin Zhuang 10 Mar '09

10 Mar '09

Dear teacher! I am interested in the magnetic simulation by using SSE package. I have a system of the cluster, including six cobalt. The hamiltonian is as follow: H=-2{J1*[ S1*S2 + S4*S5 ] + J2*[ S2*S3 + S6*S5 ] + J3*[ S3*S4 + S1*S6 ]} How do I write the model? I have read the model.xml file in the ALPS software. But the example is almost infinite system, but not isolate system in the file. Please help me!

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Correlation measurment
by zhian asadzadeh 05 Mar '09

05 Mar '09

Hi All, I am going to measure <SxSx>, <SySy> two point correlations with DMRG . Please let me know what i must do or add in the lattice and model files? Thanks, Mohammad.

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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. >

2 1

Operator definition
by zhian asadzadeh 28 Feb '09

28 Feb '09

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.

2 1

I am using it with exact diagonalization
by khalid hassan 27 Feb '09

27 Feb '09

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(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 > > > >

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Comp-phys-alps-users