Comp-phys-alps-users

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1244 discussions

parallel calculation on Windows
by orchidwood 01 Sep '14

01 Sep '14

Dear all, Can the ALPS on 64-bit Windows 7 do parallel calculation with Vistrail system? If it can do this, how?Thanks,Mu Lan

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Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 101, Issue 14
by bonanjiang＠gmail.com 26 Aug '14

26 Aug '14

Hi, Matthias, Since you said sparsediag was the code to use, then how to set the number of eignstates to calculate in the parameter file or command line? I can not find the answer in the turtorials. Bo-Nan bonanjiang(a)gmail.com From: comp-phys-alps-users-request Date: 2014-08-26 18:00 To: comp-phys-alps-users Subject: Comp-phys-alps-users Digest, Vol 101, Issue 14 Send Comp-phys-alps-users mailing list submissions to comp-phys-alps-users(a)lists.phys.ethz.ch To subscribe or … [View More]unsubscribe via the World Wide Web, visit https://lists.phys.ethz.ch/listinfo/comp-phys-alps-users or, via email, send a message with subject or body 'help' to comp-phys-alps-users-request(a)lists.phys.ethz.ch You can reach the person managing the list at comp-phys-alps-users-owner(a)lists.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. Help with LiveALPS (Niraj Ghimire) 2. a question about fulldiag (bonanjiang(a)gmail.com) 3. Re: a question about fulldiag (Matthias Troyer) ---------------------------------------------------------------------- Message: 1 Date: Mon, 25 Aug 2014 12:08:57 -0400 From: Niraj Ghimire <niraj.ghimire(a)gmail.com> To: "comp-phys-alps-users(a)lists.comp-phys.org" <comp-phys-alps-users(a)lists.comp-phys.org> Subject: [ALPS-users] Help with LiveALPS Message-ID: <CACMdJOXGtHsttzbF-+1LLxL3OmvdnntrTvcQjiJ9fsCXUGk1jQ(a)mail.gmail.com> Content-Type: text/plain; charset="utf-8" Dear ALPS users, I have been running LiveALPS from my USB flash drive and I can't get access to the internet. I could not find any information anywhere on how to resolve this issue. Would you be able to help me out ? ~Niraj -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.phys.ethz.ch/pipermail/comp-phys-alps-users/attachments/20140…> ------------------------------ Message: 2 Date: Tue, 26 Aug 2014 14:41:48 +0800 From: "bonanjiang(a)gmail.com" <bonanjiang(a)gmail.com> To: comp-phys-alps-users <comp-phys-alps-users(a)lists.phys.ethz.ch> Subject: [ALPS-users] a question about fulldiag Message-ID: <201408261441449660406(a)gmail.com> Content-Type: text/plain; charset="us-ascii" Hi, all I currently tend to calculate the energy of the lowest 4 states of a fermion system with fulldiag of ALPS. However, since the system has 12 eigenstates in total and fulldiag gives all of them, the time it takes is a little bit long. So, my question is: is there any way to limit the number of eigenstates that fulldiag calculates? for example, the lowest 4 states. Bo-Nan bonanjiang(a)gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.phys.ethz.ch/pipermail/comp-phys-alps-users/attachments/20140…> ------------------------------ Message: 3 Date: Tue, 26 Aug 2014 08:56:54 +0200 From: Matthias Troyer <troyer(a)phys.ethz.ch> To: "comp-phys-alps-users(a)lists.phys.ethz.ch" <comp-phys-alps-users(a)lists.phys.ethz.ch> Subject: Re: [ALPS-users] a question about fulldiag Message-ID: <362E955B-595C-4AE6-A412-27EA6F8EEA63(a)phys.ethz.ch> Content-Type: text/plain; charset="us-ascii" sparsediag is the code to use in this case > On Aug 26, 2014, at 8:41, "bonanjiang(a)gmail.com" <bonanjiang(a)gmail.com> wrote: > > Hi, all > I currently tend to calculate the energy of the lowest 4 states of a fermion system with fulldiag of ALPS. However, since the system has 12 eigenstates in total and fulldiag gives all of them, the time it takes is a little bit long. So, my question is: is there any way to limit the number of eigenstates that fulldiag calculates? for example, the lowest 4 states. > > Bo-Nan > bonanjiang(a)gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.phys.ethz.ch/pipermail/comp-phys-alps-users/attachments/20140…> End of Comp-phys-alps-users Digest, Vol 101, Issue 14 ***************************************************** [View Less]

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a question about fulldiag
by bonanjiang＠gmail.com 26 Aug '14

26 Aug '14

Hi, all I currently tend to calculate the energy of the lowest 4 states of a fermion system with fulldiag of ALPS. However, since the system has 12 eigenstates in total and fulldiag gives all of them, the time it takes is a little bit long. So, my question is: is there any way to limit the number of eigenstates that fulldiag calculates? for example, the lowest 4 states. Bo-Nan bonanjiang(a)gmail.com

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Help with LiveALPS
by Niraj Ghimire 20 Aug '14

20 Aug '14

Dear alps users, I am running LiveALPS on my computer and I cannot get access to the internet. I could not find any information anywhere on it. Could you please let me know how I can fix this issue ? ~Niraj

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Computing correlations with sparsediag
by Eoin Quinn 18 Aug '14

18 Aug '14

Dear ALPS users, I have a question regarding the calculation of correlations with sparsediag. Let me take for an example a one-dimensional ferromagnetic spin chain of length 4. I will not impose ‘Sz’ conservation as the problem I am having arises when ‘Sz’ is not conserved, once I impose it all works well. The following are my input parameters for the calculation: <PARAMETERS> <PARAMETER name="MEASURE_CORRELATIONS[Offdiagonal spin correlations]">Splus:Sminus</PARAMETER&… [View More]gt; <PARAMETER name="NUMBER_EIGENVALUES">1</PARAMETER> <PARAMETER name="BC">periodic</PARAMETER> <PARAMETER name="local_S">0.5</PARAMETER> <PARAMETER name="J">-1</PARAMETER> <PARAMETER name="L">4</PARAMETER> <PARAMETER name="LATTICE">chain lattice</PARAMETER> <PARAMETER name="SEED">911696590</PARAMETER> <PARAMETER name="W">1</PARAMETER> <PARAMETER name="MODEL">spin</PARAMETER> <PARAMETER name="MODEL_LIBRARY">aux/models.xml</PARAMETER> <PARAMETER name="LATTICE_LIBRARY">aux/lattices.xml</PARAMETER> <PARAMETER name="MEASURE_CORRELATIONS[Diagonal spin correlations]">Sz</PARAMETER> <PARAMETER name="CONSERVED_QUANTUMNUMBERS"></PARAMETER> <PARAMETER name="TOTAL_MOMENTUM">4.712388980384689674</PARAMETER> </PARAMETERS> The output for the ground state is then <EIGENSTATES number="1"> <QUANTUMNUMBER name="TOTAL_MOMENTUM" value="0"/> <EIGENSTATE number="0"> <SCALAR_AVERAGE name="Energy"><MEAN>-1</MEAN></SCALAR_AVERAGE> <VECTOR_AVERAGE name="Diagonal spin correlations"> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 0 )"><MEAN>0.24999999999999997</MEAN></SCALAR_AVERAGE> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 1 )"><MEAN>0.0078869096162297037</MEAN></SCALAR_AVERAGE> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 2 )"><MEAN>0.0078869096162296551</MEAN></SCALAR_AVERAGE> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 3 )"><MEAN>0.0078869096162297071</MEAN></SCALAR_AVERAGE> </VECTOR_AVERAGE> <VECTOR_AVERAGE name="Offdiagonal spin correlations"> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 0 )"><MEAN>0.55359228338317501</MEAN></SCALAR_AVERAGE> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 1 )"><MEAN>0.24211309038377027</MEAN></SCALAR_AVERAGE> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 2 )"><MEAN>0.2421130903837703</MEAN></SCALAR_AVERAGE> <SCALAR_AVERAGE indexvalue="( 0 ) -- ( 3 )"><MEAN>0.24211309038377027</MEAN></SCALAR_AVERAGE> </VECTOR_AVERAGE> </EIGENSTATE> </EIGENSTATES> The problem I am having is that the diagonal and off diagonal components of the ( 0 ) -- ( 0 ) spin correlations do not sum to 3/4 = S(S+1) = \vec{S}.\vec{S}, whereas I would expect them to. Do I understand correctly that the "Diagonal spin correlations" give <S^z(i) S^z(j)> and the "Offdiagonal spin correlations" give <S^x(i) S^x(j) + S^y(i) S^y(j)>? With best regards, Eoin [View Less]

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query regarding building of structure and its consideration in the simulation
by D´Souza, Sunil Wilfred 17 Aug '14

17 Aug '14

Dear ALPS users, I am just a beginner in the ALPS simulations.The description of my question is as follows: As a practice exercise, I want to run the quantum montecarlo simulations using the spin ½ model defined in the ALPS library to calculate the Curie temperature (Tc) of bulk Iron metal by considering the BCC structure with a = 286.65 pm. Therefore, I have generated a BCC structure with first and second nearest neighbors. I have … [View More]

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regarding the observavles in the dirloop_sse
by D´Souza, Sunil Wilfred 17 Aug '14

17 Aug '14

Dear Dr. Troyer, I am trying to calculate the observables such as binder cumulant and specific heat as a function of temperature (range 5K - 700 K) for bcc chromium in order to determine the Neel temperature by considering the Heisenberg spin 1/2 antiferromagnet model. After reading through the ALPS web documentation, i got the impression that i can use the dirloop_sse binary to accomplish the task. But, the observables like binder cumulant and specific heat are not … [View More]

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dimerized chain with DMRG
by Stone, Matthew B. 17 Aug '14

17 Aug '14

Thank you for the response regarding my prior question regarding the dimerized chain. To follow up, I would like to ask a few more novice questions. Does the DMRG ALPS routine calculate the momentum for one-dimensional systems? Does the following unitcell definition have the appropriate open boundary conditions for efficient use of the DMRG routines? <UNITCELL name="anisotropic1d" dimension="1"> <VERTEX/> <EDGE type="0"> <SOURCE vertex="1" offset="0"/> … [View More]

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Help regarding sparse diagonalization
by Sriluckshmy Viswanathan 15 Aug '14

15 Aug '14

Hi, I am writing a code for the computing gap in kitaev-heisenberg model on the honeycomb lattice using sparse diagonalization. When the coupling for the kitaev term is zero the model patch that I wrote should match the model that is inbuilt. But that doesnt happen. I may have made a mistake in the model patch which is as follows. <HAMILTONIAN name="kitaev heisenberg"> <PARAMETER name="J" default="1"/> <PARAMETER name="Jz" default="0"/> <PARAMETER name="Jx" default="0"/&… [View More]

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query regarding the units
by D´Souza, Sunil Wilfred 14 Aug '14

14 Aug '14

Dear Alps users, In the tutorial "MC-07 Phase transition in the Ising model", what is the unit in which the temperature is defined. with best regards Sunil

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