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"Found two lowering operators"
by Mateusz Łącki 14 Mar '13

14 Mar '13

Dear All, I am creating a model which is meant to be simulated with qmc. But when using worm I get: "Found two lowering operators" when using dirloop_sse: "Found two raising operators." To be frank I have no idea what is the problem. These statements are true: i have several lowering/raising operators. Is this unsupported or even worse: difficult? Best regards, Mateusz Łącki

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"Kondo Lattice" model in ALPS
by Bo-Nan JIANG 13 Mar '13

13 Mar '13

Hi, ALPS developers and users When I did DMRG with the "Kondo lattice" model in ALPS lib, the computer returned error: "Site basis for type 2 not found and no default exists." I do not know whether it is the problem of my code or the ALPS model itself, so dear developer, is this "Kondo lattice" model in your lib being tested by DMRG? If it is not, can you test it and tell my whether it works? (take you five minutes most) Thus, I can make up my mind whether I should find other way of coding or continue debuging this code which returns problem. This is really a big help! Bo-Nan -- Stay foolish,Stay hungry.

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question about fermion model
by Bo-Nan JIANG 13 Mar '13

13 Mar '13

Hi,all I am always wondering if I defined the quantum numbers of the fermion site basis in the following way, would there be a negative Ndown number (for example, with N=0, Nup=1)? <QUANTUMNUMBER name="N" min="0" max="2"/> <QUANTUMNUMBER name="Nup" min="0" max="1"/> <QUANTUMNUMBER name="Ndown" min="N-Nup" max="N-Nup"/> Bo-Nan -- Stay foolish,Stay hungry.

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DMRG in Kondo Lattice
by Bo-Nan JIANG 12 Mar '13

12 Mar '13

Hi,all I come up with a problem when I calculate the gap of Kondo lattice model with DMRG in ALPS, the computer returns: "Site basis for type 2 not found and no default exists." And I am so confused, because the model I use (Model="Kondo lattice") is from the ALPS lib. So, can you guys tell me why this error message shows up? Does the mentioned error come from the model part or the lattice part? Bo-Nan -- Stay foolish,Stay hungry.

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DMFT: Interaction expansion in the multi-orbitals with density-density interactions
by dasari＠jncasr.ac.in 11 Mar '13

11 Mar '13

Hi Emanuel Gull, Recently I installed alps-2.1.1-r6176-src on my Desktop. For my purpose I need to use multi-orbital weak coupling ctqmc as an impurity solver with in DMFT. In the alps is it possible to run the dmft with interaction expansion as an impurity solver for multi-orbitals with density-density interactions? If possible can I use it for the finite dimensional lattices(2D or 3D)? I have seen examples in the tutorial for multi-orbitals with hybridization solver only. With regards, Dasari.

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compling alps
by Mateusz Łącki 10 Mar '13

10 Mar '13

Dear All, I would like to as bout compiling alps again. This time I have problem with: [ 75%] Building Fortran object applications/dmrg/tebd/CMakeFiles/tebd.dir/core/Hdf5Interface.f90.o more preciselt the error is "module gnerated with wrong version of a compiler" The command that fails is: ifort CMakeFiles/tebd.dir/core/Hdf5Interface.f90.o -DBOOST_ALL_NO_LIB=1 -DBOOST_ALL_DYN_LINK=1 -openmp -O3 -I/usr/lib/openmpi/include -I/usr/lib/openmpi/include/openmpi -I/usr/include -I/home/lacki/opt/libhdf5-1.8.10-intel/include -I/home/lacki/opt/python-2.7.3/lib/python2.7/site-packages/numpy/core/include -I/home/lacki/opt/python-2.7.3/include/python2.7 -I/home/lacki/alps/customs/src -I/home/lacki/alps/customs/alps-2.1.1-r6176-src-with-boost/alps/src -I/home/lacki/alps/customs/alps-2.1.1-r6176-src-with-boost/boost -c /home/lacki/alps/customs/alps-2.1.1-r6176-src-with-boost/alps/applications/dmrg/tebd/core/Hdf5Interface.f90 In fact in both -I/home/lacki/opt/libhdf5-1.8.10-intel/include and -I/usr/include there is Hdf5 module but in -I/usr/include another version is present. Somehow this version takes precedence. Is there way to overcome it? On a previous computer no version of Hdf5 was installed in -I/usr/include. The solution seemes to be just swapping -I/home/lacki/opt/libhdf5-1.8.10-intel/include and -I/usr/include. my INCLUDE is /opt/intel/Compiler/13.0/composer_xe_2013.1.117/mkl/include:/home/lacki/opt/libhdf5-1.8.10-intel/include Kind Regards, Mateusz

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local magnetization in DMRG with preodic boundaries
by Emanuele Levi 10 Mar '13

10 Mar '13

Dear ALPS developers and users, I am running a DMRG simulation with alps on a Heisenberg chain with periodic boundary conditions. My parameter file is 'LATTICE' : "chain lattice", 'MODEL' : "spin", 'CONSERVED_QUANTUMNUMBERS' : 'Sz', 'L' : 24, 'Sz_total' : 0, 'Jxy' : 1, 'Jz' : 3, 'SWEEPS' : 4, 'NUM_WARMUP_STATES' : 100, 'MAXSTATES' : 100, 'NUMBER_EIGENVALUES' : 1, 'MEASURE_LOCAL[Local magnetization]' : 'Sz' In this regime I know the ground state has null global magnetization. As I am considering periodic boundaries, my results should be translationally invariant, and I should get a null local magnetization as well. Strangely enough though, when I check the local magnetization (last line of parameter file), I get a non-zero value. If I consider small L I find a local magnetization of the order E-7, which means practically 0. But when I grow the chain, this number rises, and in the case I am attaching is alternating, and of order 0.0275. How could it be possible? Are not periodic boundary conditions enough to constrain to impose invariance under translation in the final state? Moreover it really looks like considering more states and sweeping more doesn't help. Thanks in advance for any help. Kindest regards. -- Emanuele Levi emanuele.levi(a)gmail.com

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total momentum in DMRG
by Emanuele Levi 09 Mar '13

09 Mar '13

Dear ALPS developers and users, in considering a periodic spin system, is there a way in ALPS to fix the total momentum from the beginning, or measure it? Many thanks. Kindest regards. -- Emanuele Levi emanuele.levi(a)gmail.com

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constraint in Kondo lattice model
by Bo-Nan JIANG 09 Mar '13

09 Mar '13

Hi,all If I set the constraint quantum number to be Sz in the Kondo lattice model, but do not specify which type it is(spin or fermion), so does it mean that the conserved quantum number is the total Sz of Sz_spin + Sz_fermion? And if I set the type of constraint to be spin or fermion, in other orders, type="1" or type="0", then the conserved quantum number is the total Sz of spin or fermion? While for quantum number N which only belongs to type="0" alternative fermion (SITEBASIS "spin" does not have it), then whether I specify the type or not in <CONSTRAINT >, the conserved quantum number shall always be the the total number of fermion.This is my understanding of this part of ALPS, and am I right? Bo-Nan -- Stay foolish,Stay hungry.

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matrices as alps input
by Mateusz Łącki 08 Mar '13

08 Mar '13

Dear All, I am writing again as it seems taht my email got forgotten. I would like to ask again if it is possible to define local operators somehow as matrices (and giving matrices as a table of numbers). That is instead if defining rule that n^2 operator should have matrix element n*n i would liket o be able to say that: T= 1 |1><1> + 6.78 |2><2| + 78.2 |3><3| +... for diagonal operator (and possibly also for nondiagonal operators). Up to now the onyl way i thought was to define a kronecker delta operator (in the code, recompile) which would be used to define: KD(1,n) + KD(2,n)+6.78 +78.2 DK(3,n) for the diagonal operators... Regards, Mateusz

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