Comp-phys-alps-users

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1248 discussions

working on alps code
by khalid hassan 27 Mar '09

27 Mar '09

alps is a program that works well with a comprehensive help. but if one has use its code for one self research, the code provides little help. it has very few comments and difficult to understand. Can there can be any help for the code of full diagonalization for example logical structure, flow chart, algorithm available. If this is in personal files of the developers can they send by email or if someone visits them they can give him. Best Regards Khalid Loane ITCP, Graz Austria

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An ALPS milestone
by Simon Trebst 26 Mar '09

26 Mar '09

Dear fellow ALPS developers and users, in recent days the ALPS project has passed yet another milestone -- we have now collected more than 100 publications citing the ALPS project. Congratulations everyone! I think it's also quite interesting to take a closer look at these references: Out of the 102 references, 84 are published articles, 18 are preprints. More than a quarter of all published articles (23/84) are PRLs -- an unusually high percentage. And more than a quarter of all references (28/102) are from groups of authors that do not include an ALPS developer. For a complete list go to https://alps.ethz.ch/mediawiki/index.php/PapersTalks #Papers_citing_the_ALPS_project Best regards, Simon

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uniform magnetic susceptibility
by Guilin Zhuang 24 Mar '09

24 Mar '09

Dear All prof. As for chemistry major, the QMC and magnetic knowledge is not enough for me ! Here I ask the same question again! In the simulation of SSE by the version 1.2.2 of ALPS, I have to know the conversion factor between the molar magnetic susceptibility and uniform magnetic susceptibility. I produce the following equation between them. If the dimension for couple parameter J is cm-1, and conversion equation: chi_mol=Na * mu_b * g * chi_sse The unit of chi_mol: cm3*mol-1, the unit of chi_sse: cm. Na: Avogadro constant, 6.022*10^23 mol-1 mu_b: Bohr magneton, 9.274*10^(-21) emu(A)*cm^2 g: Lange factor Is it right? If not,what is it? I really hope you to help me! Thank you a lot!

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Energy Gap
by zhian asadzadeh 24 Mar '09

24 Mar '09

Hi Dear, I tried to calculate energy gap for ferrimagnetic ladder. in this paper ( Phy Rev B, 63, 054432) it has been done which you can find in table I. I used the periodic boundary condition because in the case of open boundary condition the energy converges very slowly. I have achieved the following result. E0= -0.757036 E1= -0.757032 I have used the following input file: I have tried for inter chain coupling J' = 0.2 with the notation of this paper. LATTICE="ferrimagnetic ladder" SWEEPS=4 MAXSTATES=300 MODEL="spin", L=30 local_S0=1/2,local_S1=1,Jxy0=1,h=0.0,Jxy1=0.2,Jz1=0.2 BC1=periodic,BC2=periodic NUMBER_EIGENVALUES=2 Jz0=1 {Gamma=0.0;} which L is the number of unit cell and h, Gamma are longitudinal and transverse magnetic field respectively. Jz0 , Jxy0 are chain couplings and Jz1, and Jxy1 are inter chain couplings. we see that the result is not concur with this paper for energy gap. I see in this paper lanczos method is used but I expect that the result be same in 4 digit. please let me know what is wrong? Thanks, Mohammad. On Wed, Mar 18, 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. Energy Gap (zhian asadzadeh) > 2. Re: Energy Gap (Matthias Troyer) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 17 Mar 2009 14:43:46 +0330 > From: zhian asadzadeh <zhian.asadzadeh(a)gmail.com> > Subject: [ALPS-users] Energy Gap > To: comp-phys-alps-users(a)phys.ethz.ch > Message-ID: > <89e5d6760903170413w7e72ef85i873b8d47564f4320(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Dear, > > Thank you for your consideration. > My model is anisotropic Ferrimagnetic chain in transverse magnetic field. > when I say the result is wrong I mean when I have tried to obtain energy > gap > for some problems and models which have been solved earlier I saw the > result doesn't agree with those earlier results. for example spin one and > half-one chain and ferrimagnetic chain and anisotropic ferrimagnetic > ladder. > Something is not very obvius for me, how DMRG calculate ground state and > first exited state from one wave function ?! > > Thanks, > Zhian. > > > On Tue, Mar 17, 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. Re: Energy Gap (Matthias Troyer) > > > > > > ---------------------------------------------------------------------- > > > > Message: 1 > > Date: Mon, 16 Mar 2009 12:33:11 -0700 > > From: Matthias Troyer <troyer(a)phys.ethz.ch> > > Subject: Re: [ALPS-users] Energy Gap > > To: comp-phys-alps-users(a)phys.ethz.ch > > Message-ID: <43E825E5-7BE3-4EA0-9C2A-20A1FC8C21AF(a)phys.ethz.ch> > > Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes > > > > > > On Mar 16, 2009, at 2:01 AM, zhian asadzadeh wrote: > > > > > Hi All, > > > > > > I want to calculate energy gap for spin chain with DMRG. I set > > > NUM_EIGENVALUES=2 in my parm file but the result which achieved is > > > wrong. > > > Is it necessary to determine something else for example the sector > > > which DMRG work in it? in my problem I dont have any good symmetry > > > and I can not easily determine the sector which the first exited > > > state is in it. I would be very appreciate if someone could please > > > help me. > > > > > > Thanks, > > > Zhian. > > > > Can you please send more details about your model, or better yet the > > input file? An what do you mean exactly by saying that the result is > > wrong? > > > > Matthias > > > > > > > > End of Comp-phys-alps-users Digest, Vol 36, Issue 10 > > **************************************************** > > >

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dynamical correlation functions
by jessica.alfonsi＠unipd.it 23 Mar '09

23 Mar '09

Hello everybody, I'm interested in starting using ALPS project, in particular for computing optical spectral functions starting from exact diagonalization and dynamical correlation function for optical conductivity. However, I read in papers about ALPS 1.3 release that these will be implemented in release 1.4 . When do you plan to release at least the first beta of ALPS 1.4 ? Is it possible to use a patched SVN version ? Thank you and best wishes Jessica Alfonsi

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again local measurements
by Jakub Zakrzewski 18 Mar '09

18 Mar '09

Hello, I asked once but got little reply. So may be this time .... :-) If I want to get <n_i> in Bose-Hubbard (i-numbers sites) I put MEASURE_LOCAL[density]=n; (either in QMC or diagonalizations or DMRG).. Can I get easily e.g. <n_i^2> without recompiling applications ? Can I get both <n_i> and <n_i^2> from the same run ? Can I get e.g. <n_in_j> ? best wishes Kuba __________________________________________________________________

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Energy Gap
by zhian asadzadeh 17 Mar '09

17 Mar '09

Hi Dear, Thank you for your consideration. My model is anisotropic Ferrimagnetic chain in transverse magnetic field. when I say the result is wrong I mean when I have tried to obtain energy gap for some problems and models which have been solved earlier I saw the result doesn't agree with those earlier results. for example spin one and half-one chain and ferrimagnetic chain and anisotropic ferrimagnetic ladder. Something is not very obvius for me, how DMRG calculate ground state and first exited state from one wave function ?! Thanks, Zhian. On Tue, Mar 17, 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. Re: Energy Gap (Matthias Troyer) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 16 Mar 2009 12:33:11 -0700 > From: Matthias Troyer <troyer(a)phys.ethz.ch> > Subject: Re: [ALPS-users] Energy Gap > To: comp-phys-alps-users(a)phys.ethz.ch > Message-ID: <43E825E5-7BE3-4EA0-9C2A-20A1FC8C21AF(a)phys.ethz.ch> > Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes > > > On Mar 16, 2009, at 2:01 AM, zhian asadzadeh wrote: > > > Hi All, > > > > I want to calculate energy gap for spin chain with DMRG. I set > > NUM_EIGENVALUES=2 in my parm file but the result which achieved is > > wrong. > > Is it necessary to determine something else for example the sector > > which DMRG work in it? in my problem I dont have any good symmetry > > and I can not easily determine the sector which the first exited > > state is in it. I would be very appreciate if someone could please > > help me. > > > > Thanks, > > Zhian. > > Can you please send more details about your model, or better yet the > input file? An what do you mean exactly by saying that the result is > wrong? > > Matthias > > > > End of Comp-phys-alps-users Digest, Vol 36, Issue 10 > **************************************************** >

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Energy Gap
by zhian asadzadeh 16 Mar '09

16 Mar '09

Hi All, I want to calculate energy gap for spin chain with DMRG. I set NUM_EIGENVALUES=2 in my parm file but the result which achieved is wrong. Is it necessary to determine something else for example the sector which DMRG work in it? in my problem I dont have any good symmetry and I can not easily determine the sector which the first exited state is in it. I would be very appreciate if someone could please help me. Thanks, Zhian.

2 1

Compile error for alps 1.3.4 version
by Guilin Zhuang 15 Mar '09

15 Mar '09

Hi! Platform: Red Hat 3.4.3-9.EL4 GCC: 3.4.3 version C++ Boost: 1.34.0,1.35.0,1.36.0,1.38.0 (all were tried) But it is occur that the same error: ./../src/alps/alea/simplebinning.h:602: error: `it' undeclared (first use this function) ./../src/alps/alea/simplebinning.h:602: error: (Each undeclared identifier is reported only once for each function it appears in.) make[2]: *** [observableset.lo] Error 1 make[2]: Leaving directory `/home/glz/ALPSSource/alps-1.3.4/lib/alps' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/glz/ALPSSource/alps-1.3.4/lib' make: *** [all-recursive] Error 1 please help me! Thanks a lot!

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Dimension
by Guilin Zhuang 12 Mar '09

12 Mar '09

Hi,teachers! I am first user of SSE in the ALPS software. I havs a simple but important question: 1, How is the susceptibility of simulation by using the SSE package converted to the susceptibility chi(unit: cm3) from the magnetic experiment? 2, What is the dimension of magnetization strength and field strength? Oe or T? Thanks a lot.

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