April 2009 - Comp-phys-alps-users

Installing problems
by zhian asadzadeh 22 Apr '09

22 Apr '09

Hi All, I got a following error in make step of installation the libraries, *./../src/alps/parameter/parameterlist.C:110: instantiated from here /usr/include/boost/spirit/core/primitives/primitives.hpp:113: error: ISO C++ for bids comparison between pointer and integer make[2]: *** [parameterlist.lo] Error 1 make[2]: Leaving directory `/home/user59/alps-1.3.4/lib/alps' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/user59/alps-1.3.4/lib' make: *** [all-recursive] Error 1 *I will be very appreciate If you could please help me. Thanks, Zhian* *

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3 particles with 0.5 total spin
by khalid hassan 19 Apr '09

19 Apr '09

Dear Sir I am not able to calculate the energy states for the fermionic hubbard model for 2 by 2 plaquette for 3 particles total spin S=0.5 Actually for 3 particles the total spin comes out to be 1.5 as measured by MEASURE_AVERAGE[Magnetization]="Sz" command I need the energies for the model described above. please write a program for me. I am very upset as I tried all the combinations I think and get the same input. Thats why this is third mail from me in this day. Best Regards Khalid Loane

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difference in square and anisotropic lattice
by khalid hassan 18 Apr '09

18 Apr '09

Dear alps team I got the results. the only mistake I was making is to use anisotropic lattice instead of square lattice. what is difference in anisotropic lattice with L=2 W=2 and square lattice with L=2. thanks Best regards Khalid Loane

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alps in ubuntu hardy
by sinan bulut 17 Apr '09

17 Apr '09

Does anyone know or have experience on how to install alps in ubuntu(hardy 8.04) ? I tried to install it from the source using "configure, make ... etc" commands but it did not work.

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3 particle Sz half 2 by 2 plaquette
by khalid hassan 17 Apr '09

17 Apr '09

Dear alps team I am using fulldiag program for a system of 2 by 2 plaquette on fermion hubbard. Now I want it to solve for 3 particles and Sz = 0.5. When I display the values for Sz, it comes out to be 1.5. By hit and trial I come to know that alps only calculating Sz=0.5 for one particle only, when there are three particles Sz comes out to be 1.5. I definitely making some mistake in input file. I need a program that calculate 2 by 2 plaquette with fermion hubbard model with 3 particle and total spin 0.5 My program statements are as under but they are calculating 3 particles and total spin Sz= 1.5 which I even not mentioned. LATTICE_LIBRARY="/temp/ALPS/xml/lattices.xml"; MODEL_LIBRARY="/temp/ALPS/xml/models.xml"; MODEL="fermion Hubbard"; LATTICE="anisotropic square lattice"; MEASURE_AVERAGE[Density]="n" MEASURE_AVERAGE[Magnetization]="Sz" L=2; W=2; U=10.0; CONSERVED_QUANTUMNUMBERS="Sz,N"; Sz_total=0.5; N_Total=3; { t=1.0;} I am student and therefore something I make comments in hurry. Best Regards Khalid Loane

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when I get my answers
by khalid hassan 17 Apr '09

17 Apr '09

I have posted these messages. They have no answers. Please take some time to answer them as I am student and answers from your part are very important to me. I am waiting Dear alps team, I am reproducing the spectrum on page 3 of this paper, which is the Lowest spectrum of the hubbard model on a plaquette. Eigenstates are labelled by total spin S and plaquette momentum Qx,Qy = 0, ?. author = "Ehud Altman and Assa Auerbach", title = "Plaquette Boson -- Fermion Model of Cuprates", condmat = "cond-mat/0108087", I have written the following program LATTICE_LIBRARY="/temp/ALPS/xml/lattices.xml" MODEL_LIBRARY="/temp/ALPS/xml/models.xml" MODEL="fermion Hubbard" LATTICE="anisotropic square lattice" L=2 W=2 U=1000000000 CONSERVED_QUANTUMNUMBERS="N,Sz" {N_total=3; Sz_total=0.5; t=1.0;} {N_total=3; Sz_total=1.5; t=1.0;} my results with fulldiag are not matching with the paper. Probably I am not mentiong the total_spin total_particle or conserved quantum number properly. i recognize 0 holes as 4 particles, 1 holes as 3 particles and 2 holes as 2 particles in 2 by 2 pluquette. Please take some time to correct me. Best Regards Khalid loane ------------------------------ Message: 3 Date: Thu, 16 Apr 2009 11:55:03 -0700 (PDT) From: khalid hassan <mkhloane(a)yahoo.com> Subject: [ALPS-users] repharasing the lowest spectrum fermion hubbard question To: alps users alps users <comp-phys-alps-users(a)phys.ethz.ch> Message-ID: <178183.68074.qm(a)web59405.mail.ac4.yahoo.com> Content-Type: text/plain; charset=us-ascii Dear alps team i want ti rephrase my question to make it more precise I have fermion hubbard model 2 by 2 square plaquette total number of particle = 3 total spin S= 1/2 need ground state energy which will be plaquette momentum (Pi,0) and (0, Pi) degenerate The program I wrote is giving plaquette momentum (0,0) and (0,Pi) as ground state, which is wrong as seen in the paper. My statements are under. Please correct my statements. I tried very much but could not find the correct ground states. It is trivial task as written in paper. LATTICE_LIBRARY="/temp/ALPS/xml/lattices.xml"; MODEL_LIBRARY="/temp/ALPS/xml/models.xml"; MODEL="fermion Hubbard"; LATTICE="anisotropic square lattice"; L=2; W=2; Sz_total=0.5; U=0.5; CONSERVED_QUANTUMNUMBERS="N,Sz" N_total=3 { t=1.0;} Best Regards Khalid Loane Dear alps team, I am reproducing the spectrum on page 3 of this paper, which is the Lowest spectrum of the hubbard model on a plaquette. Eigenstates are labelled by total spin S and plaquette momentum Qx,Qy = 0, ?. author = "Ehud Altman and Assa Auerbach", title = "Plaquette Boson -- Fermion Model of Cuprates", condmat = "cond-mat/0108087", I have written the following program LATTICE_LIBRARY="/temp/ALPS/xml/lattices.xml" MODEL_LIBRARY="/temp/ALPS/xml/models.xml" MODEL="fermion Hubbard" LATTICE="anisotropic square lattice" L=2 W=2 U=1000000000 CONSERVED_QUANTUMNUMBERS="N,Sz" {N_total=3; Sz_total=0.5; t=1.0;} {N_total=3; Sz_total=1.5; t=1.0;} my results with fulldiag are not matching with the paper. Probably I am not mentiong the total_spin total_particle or conserved quantum number properly. i recognize 0 holes as 4 particles, 1 holes as 3 particles and 2 holes as 2 particles in 2 by 2 pluquette. Please take some time to correct me. Best Regards Khalid loane

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repharasing the lowest spectrum fermion hubbard question
by khalid hassan 16 Apr '09

16 Apr '09

Dear alps team i want ti rephrase my question to make it more precise I have fermion hubbard model 2 by 2 square plaquette total number of particle = 3 total spin S= 1/2 need ground state energy which will be plaquette momentum (Pi,0) and (0, Pi) degenerate The program I wrote is giving plaquette momentum (0,0) and (0,Pi) as ground state, which is wrong as seen in the paper. My statements are under. Please correct my statements. I tried very much but could not find the correct ground states. It is trivial task as written in paper. LATTICE_LIBRARY="/temp/ALPS/xml/lattices.xml"; MODEL_LIBRARY="/temp/ALPS/xml/models.xml"; MODEL="fermion Hubbard"; LATTICE="anisotropic square lattice"; L=2; W=2; Sz_total=0.5; U=0.5; CONSERVED_QUANTUMNUMBERS="N,Sz" N_total=3 { t=1.0;} Best Regards Khalid Loane

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Lowest spectrum of the hubbard model on a plaquette
by khalid hassan 16 Apr '09

16 Apr '09

Dear alps team, I am reproducing the spectrum on page 3 of this paper, which is the Lowest spectrum of the hubbard model on a plaquette. Eigenstates are labelled by total spin S and plaquette momentum Qx,Qy = 0, π. author = "Ehud Altman and Assa Auerbach", title = "Plaquette Boson -- Fermion Model of Cuprates", condmat = "cond-mat/0108087", I have written the following program LATTICE_LIBRARY="/temp/ALPS/xml/lattices.xml" MODEL_LIBRARY="/temp/ALPS/xml/models.xml" MODEL="fermion Hubbard" LATTICE="anisotropic square lattice" L=2 W=2 U=1000000000 CONSERVED_QUANTUMNUMBERS="N,Sz" {N_total=3; Sz_total=0.5; t=1.0;} {N_total=3; Sz_total=1.5; t=1.0;} my results with fulldiag are not matching with the paper. Probably I am not mentiong the total_spin total_particle or conserved quantum number properly. i recognize 0 holes as 4 particles, 1 holes as 3 particles and 2 holes as 2 particles in 2 by 2 pluquette. Please take some time to correct me. Best Regards Khalid loane

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error in lp_solve 4.0
by sinan bulut 16 Apr '09

16 Apr '09

Hi all, While installing the lp_solve_4.0 tar.gz file that i downloaded from alps website, i got the following error when I ran the command "make": make: bison: Command not found make: *** [lp.c] Error 127 Does anyone has any experience with installing lp_solve and have any idea about how to fix these errors? Should I disregard these errors and proceed with "make install"? I would appreciate your help. Thanks.

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increasing the SWEEP
by Fu-Jiun Jiang ITP 16 Apr '09

16 Apr '09

Hello ALPS users Someone had already asked this question before. However the problem is still there, namely one cannot use the method indicated in the instruction to increase the SWEEP for a MC simualtion (for both loop and dirloop_sse). It is be very useful to get the " function " of " increasing the SWEEP " in ALPS worked. For a reason I only need to double the SWEEP (to obtain a convergence). It is O.K. to let the simulation extended for 10 days but if I restart the simulation, then it will take 20 days which I want to avoid if possible. FJ

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