Just define Sx, which is real:
<SITEOPERATOR name="Sx" site="i"> 1/2*(Splus(i)+Sminus(i)) </SITEOPERATOR>
On 28 Apr 2009, at 12:44, Justin David Peel wrote:
You're correct. It isn't quite right. It should be divided by i:
<SITEOPERATOR name="Sy" site="x"> 1/2*(Splus(x)-Sminus(x))/sqrt(-1) </SITEOPERATOR>
From: comp-phys-alps-users-bounces@phys.ethz.ch [comp-phys-alps-users-bounces@phys.ethz.ch ] On Behalf Of zhian asadzadeh [zhian.asadzadeh@gmail.com] Sent: Tuesday, April 28, 2009 5:56 AM To: comp-phys-alps-users@phys.ethz.ch Subject: [ALPS-users] Advanced correlation functions
Hi Dear,
Thank you for your guidance, but the mentioned definition for Sy doesn't work. And for the first question, how I can change the code for measuring those two kind of correlations? I mean the correlation of first site with others and middle site with others too.
Thanks, Zhian.
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Today's Topics:
- Re: lapack support in ALPS (Synge Todo)
- Re: Advanced correlation functions (Justin David Peel)
- Re: Comp-phys-alps-users Digest, Vol 37, Issue 18 (Justin David Peel)
Message: 1 Date: Mon, 27 Apr 2009 19:51:14 +0900 From: Synge Todo <wistaria@comp-phys.org<mailto:wistaria@comp- phys.org>> Subject: Re: [ALPS-users] lapack support in ALPS To: comp-phys-alps-users@phys.ethz.ch<mailto:comp-phys-alps-users@phys.ethz.ch
Message-ID: <04B17733-4F07-4867-8B22-4343337160BB@comp-phys.org<mailto:04B17733-4F07-4867-8B22-4343337160BB@comp-phys.org
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Dear Fu-Jiun Jiang,
On 2009/04/23, at 23:39, Fu-Jiun Jiang ITP wrote:
When install the ALPS with lapack being supported, what command should be used? In the instruction, it is said --with-lapack-dir=/path/to/my/lapack/ --with-lapack="-l my_lapack". Is it true that first one should point to where the lapack library is. How about the second one? Thanks.
In many cases, lapack installation will be found automatically without any options. If this is not the case, please your system administrator about the linker options to link your program against lapack. For example, if you are linking liblapack.a and libblas.a in /path/to/my/lapack, then the configure options should be
--with-lapack-dir=/path/to/my/lapack --with-lapack="-llapack -lblas"
Synge
Message: 2 Date: Mon, 27 Apr 2009 11:35:24 -0600 From: Justin David Peel <justin.peel@utah.edu<mailto:justin.peel@utah.edu
Subject: Re: [ALPS-users] Advanced correlation functions To: "comp-phys-alps-users@phys.ethz.ch<mailto:comp-phys-alps-users@phys.ethz.ch
"
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I'm not sure about only measuring those two correlations (you might have to change the code for that), but, as to your last question, you should be able to use Sx:Sx because the Sx operator is defined in the models.xml file in terms of the raising and lowering operators. If you want to measure Sy, you would have to add the following lines to the models.xml file:
<SITEOPERATOR name="Sy" site="x"> 1/2*(Splus(x)-Sminus(x)) </SITEOPERATOR>
because it hasn't been defined as far as I can tell.
Good luck, Justin ________________________________________ From: comp-phys-alps-users-bounces@phys.ethz.ch<mailto:comp-phys-alps-users-bounces@phys.ethz.ch
[comp-phys-alps-users-bounces@phys.ethz.ch<mailto:comp-phys-alps-users-bounces@phys.ethz.ch ] On Behalf Of zhian asadzadeh [zhian.asadzadeh@gmail.com<mailto:zhian.asadzadeh@gmail.com ]
Sent: Sunday, April 26, 2009 1:54 AM To: Comp-phys-alps-users@phys.ethz.ch<mailto:Comp-phys-alps-users@phys.ethz.ch
Subject: [ALPS-users] Advanced correlation functions
Hi All,
I am using DMRG for my problem and I am going to measure diagonal and offdiagonal correlation functions. I am interest to obtain the correlation of first site with other sites and the middle site with other sites too. The output of DMRG consist of all the combinations which are possible but I just want the two correlations mentioned above because the output will be very large ( I am studying the ferrimagnetic chain with 100 sites). can I do that? how? And also can I use Sx:Sx for measuring off diagonal correlation functions?
Thanks, Zhian.
Message: 3 Date: Mon, 27 Apr 2009 11:42:56 -0600 From: Justin David Peel <justin.peel@utah.edu<mailto:justin.peel@utah.edu
Subject: Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 37, Issue 18 To: "comp-phys-alps-users@phys.ethz.ch<mailto:comp-phys-alps-users@phys.ethz.ch
"
<comp-phys-alps-users@phys.ethz.ch<mailto:comp-phys-alps-users@phys.ethz.chMessage-ID: <3E5F591958142A40B693A5FC6672D4942624680107@C8V1.xds.umail.utah.edu <mailto:3E5F591958142A40B693A5FC6672D4942624680107@C8V1.xds.umail.utah.edu
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Someone correct me if I'm wrong, but I believe this isn't very directly feasible. The ground state vector from the exact ground state will be in a different basis and have a different length than the ground state vector from DMRG (it's a truncated basis after all). ________________________________________ From: comp-phys-alps-users-bounces@phys.ethz.ch<mailto:comp-phys-alps-users-bounces@phys.ethz.ch
[comp-phys-alps-users-bounces@phys.ethz.ch<mailto:comp-phys-alps-users-bounces@phys.ethz.ch ] On Behalf Of Gang Chen [chggst@physics.ucsb.edu<mailto:chggst@physics.ucsb.edu ]
Sent: Saturday, April 25, 2009 9:55 AM To: comp-phys-alps-users@phys.ethz.ch<mailto:comp-phys-alps-users@phys.ethz.ch
Subject: Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 37, Issue 18
Thanks, I want to compute the overlap between the exact ground state and the state I generated from other method.
best, Gang
On Sat, Apr 25, 2009 at 3:00 AM, <comp-phys-alps-users-request@phys.ethz.ch mailto:comp-phys-alps-users-request@phys.ethz.ch<mailto:comp-phys-alps-users-request@phys.ethz.ch mailto:comp-phys-alps-users-request@phys.ethz.ch>> wrote: Send Comp-phys-alps-users mailing list submissions to comp-phys-alps-users@phys.ethz.ch<mailto:comp-phys-alps-users@phys.ethz.ch
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Today's Topics:
- extract the ground state from DMRG or Exact diagonalization (Gang Chen)
- Re: extract the ground state from DMRG or Exact diagonalization (Justin David Peel)
Message: 1 Date: Fri, 24 Apr 2009 14:57:02 -0700 From: Gang Chen <chggst@physics.ucsb.edu<mailto:chggst@physics.ucsb.edu
<mailto:chggst@physics.ucsb.edumailto:chggst@physics.ucsb.edu>>
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Hi All,
If I use DMRG or Exact diagonalization to find the ground state of my Hamiltonian. How can I extract the ground state vector (the numerical vector) from my results?
best,
-- GANG CHEN Department of Physics University of California Santa Barbara, CA 93106 Office: Broida 6216 Phone: 805-893-5260 Fax: 805-893-3378