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zhian.asadzadeh@gmail.com has indicated you're a friend. Accept?
by zhian.asadzadeh＠gmail.com 17 Jun '15

17 Jun '15

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TEBD Fermion Hubbard with kink initial condition
by Deepak Iyer 16 Jun '15

16 Jun '15

Hi all, I couldn't find this addressed on the forums or docs. I get a segfault (invalid memory reference) while trying to run TEBD on the fermion Hubbard with kink initial state. I imagine it is getting confused while trying to set up the initial state. Any way I can get around this? Thanks! Deepak

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cmake error while building ALPS
by pradeep thakur 15 Jun '15

15 Jun '15

Dear ALPS-users and developers, While building ALPS from source "alps-2.1.1-r6176-src-with-boost" on a machine with operating system Xubuntu 12.04.5 LTS, I executed the following step in the build directory: $ cmake -D Boost_ROOT_DIR:PATH=/path/to/boost/directory /path/to/alps/directory giving the appropriate paths as follows: $ sudo cmake -D Boost_ROOT:DIR=/home/emmy/alps/alps-2.1.1-r6176-src-with-boost/boost/ /home/emmy/alps/alps-2.1.1-r6176-src-with-boost/alps/ The output was as shown below. The errors are mentioned at the end. I'm unable to complete configuration: ----------------------------------------------------- -- The C compiler identification is GNU -- The CXX compiler identification is GNU -- Check for working C compiler: /usr/bin/gcc -- Check for working C compiler: /usr/bin/gcc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Build type: Release -- Python interpreter /usr/bin/python -- Python interpreter ok : version 2.7.3 -- PYTHON_INCLUDE_DIRS = /usr/include/python2.7 -- PYTHON_NUMPY_INCLUDE_DIR = /usr/lib/python2.7/dist-packages/numpy/core/include -- PYTHON_SITE_PKG = /usr/lib/python2.7/dist-packages -- PYTHON_LIBRARY = /usr/lib/python2.7/config/libpython2.7.so -- PYTHON_EXTRA_LIBS =-lssl -lcrypto -lssl -lcrypto -L/usr/lib -lz -lpthread -ldl -lutil -- PYTHON_LINK_FOR_SHARED = -Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions -- ALPS version: 2.1.1 -- Looking for rpc/rpc.h -- Looking for rpc/rpc.h - found -- Looking for stdarg.h -- Looking for stdarg.h - found -- Looking for sys/stat.h -- Looking for sys/stat.h - found -- Looking for sys/systeminfo.h -- Looking for sys/systeminfo.h - not found -- Looking for sys/types.h -- Looking for sys/types.h - found -- Looking for unistd.h -- Looking for unistd.h - found -- Looking for windows.h -- Looking for windows.h - not found -- Looking for C++ include valarray -- Looking for C++ include valarray - found -- Looking for precompiled Boost libraries (version >= 1.47) CMake Error at /usr/share/cmake-2.8/Modules/FindBoost.cmake:426 (message): ERROR: Boost_ROOT is not the correct spelling. The proper spelling is BOOST_ROOT. Call Stack (most recent call first): /usr/share/cmake-2.8/Modules/FindBoost.cmake:572 (_Boost_CHECK_SPELLING) config/FindBoostForALPS.cmake:30 (find_package) CMakeLists.txt:248 (find_package) -- Configuring incomplete, errors occurred! -------------------------------------------------------- I changed the spelling in the command, but to no avail. Please do me a kindness by helping me here. Regards, Pradeep

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NN and NNN Heisenberg interactions on lattices: ALPS MC
by Swagata Acharya 05 Jun '15

05 Jun '15

Hi I simple want to write a script for 2d square lattice, with AFM Heisenberg interaction on nearest and next nearest neighbor bonds. How do I know if naming them respectively J0, and J1 (both AFM) should work or not? If I name them instead J1 and J2 should that work? My input file presently looks like: parms.append( { 'LATTICE' : "frustrated square lattice", 'T' : t, 'J0' : -1 , 'J1' : -0.5 , 'THERMALIZATION' : 10000, 'SWEEPS' : 500000, 'UPDATE' : "cluster", 'MODEL' : "Heisenberg", 'L' : 8, 'W' : 8 } ) I want NN J to be 1.0 and NNN J to be 0.5. Is that going in properly? The term "frustrated" in front of "square lattice", should that be necessary? What would be the extension of the name for the lattice when I do a cubic lattice, say, with J1 (NN), J2 (NNN), J3(NNNN)? How do I know in that case which direction is preferentially x, y and z? Thanks in advance for all the replies. Swagata -- *........................................................................................................................................................................Swagata Acharya* Dept. of Physics and Meteorology IIT Kharagpur B C Roy Hall of Residence Room NW 204 Mob: +91 9836893829 +91 9088377636 Volunteer : Padakshep , Vivekananda Study Circle Secretary: Padakshep(www.padakshep.org) *................................................................................................................................*

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failure of return of expectation value with mps method
by Cathy Wu 04 Jun '15

04 Jun '15

Hi everyone, I have been trying to calculate the expectation value of certain variables defined by 'MEASURE_AVERAGE[NAME]' using mps_evolve function and obtained the output .h5 file by running the function 'loadIterationMeasuremen', energy and parameters were returned, but the measurements were not!!!! So i used a h5 file viewer and found out that the results were actually collected under the repository /spectrum/iteration. I also tried the 4 tutorial scripts in mps-06-kink file and same story happened. There are two things I want to consult, 1. is it correct that the expectation value are stored under spectrum/iteration? and I am also a little baffled why the folders under iteration are named with random numbers. 2. how to read the results with functions from alps. I tried to read the .h5 file with h5py module of python and it does not recognize any dataset as 'spectrum'. Please help![?] best,

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Honeycomb lattice not working with boson Hubbard model
by Kristina Fidanovski 03 Jun '15

03 Jun '15

Dear Developers, I'm trying to look into the extended boson Hubbard model on a honeycomb lattice, but no matter what I do the density always comes out as zero. I don't seem to have the same problem when using a honeycomb lattice with any of the other examples in the tutorials. What could be the problem? All the best, Kristina

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New model not adapted in TEBD
by Cathy Wu 28 May '15

28 May '15

Dear ALPS developers, I have constructed a new model of 1-D interaction fermionic system with disorder and this model works perfectly fun in spectrum function and Lanczos methods. And now I am trying to do the exact solution of time evolution, but it reports "Hamiltonian " type not recognized! use 'Spin'...(whatever exists in models.xml before). Does anyone know how to fix it! Good day!

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Question please
by Hocine Ahmed 26 May '15

26 May '15

Dear ALPS developers Hello I have creat the input file withe python (test.py) and when I write the input file for the Alps simulation, I have this erreur message:>>> input_file = pyalps.test.txt('parm1',parms) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'module' object has no attribute 'test' Best regards Hocine ------------------------------------------------------------------------- Mr Hocine Ahmed LABORATORY FOR THEORETICAL PHYSICS AND MATERIAL PHYSICS HASSIBA BENBOUALI UNIVERSITY BP. 151, 02000 CHLEF, ALGERIA Tel:+213790974582 ; mail: ah.hocine(a)univ-chlef.dz

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Transversal Heisenberg XXZ
by Thomas SCHMIDT 20 May '15

20 May '15

Dear all, I would like to use the ALPS dmrg routines to simulate the transversal spin-1/2 XXZ Heisenberg model, i.e., with magnetic field in X-direction. While a magnetic field in Z-direction [Hz = B*Sz(i)] poses no problems, a magnetic field in X-direction [Hx = B*(Splus(i) + Sminus(i))] destroys convergence completely. I am aware that Hx violates Sz-conservation, but XXZ+Hz is easily solved by the dmrg package even without assuming conserved quantum numbers, so I guess conserved quantum numbers are probably not an issue for the small systems I'm considering (32 sites). Is the bad convergence in the Hx case something which is expected or do you rather suspect an error in my configuration? Thanks a lot! Sincerely, Thomas -- ----------------------------------------------------------- Prof. Dr. Thomas L. Schmidt Theory of Mesocopic Systems 162a, avenue de la Faïencerie Phone: (+352) 46 66 44 6158 Université du Luxembourg Email: thomas.schmidt(a)uni.lu L-1511 Luxembourg http://www.tlschmidt.com -----------------------------------------------------------

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Meaning of parameter "SPINFLIP"
by backes＠th.physik.uni-frankfurt.de 20 May '15

20 May '15

Dear ALPS developers, I was wondering about the meaning of the parameter SPINFLIP for the CT-HYB impurity solver. The documentation mentions: SPINFLIP={0,1} specifies whether to perform spin flip updates. In such an update a segment is moved from one orbital to another, if the latter is empty. Does this correspond to a global move that flips all spins, i.e. for enforcing a paramagnetic solution or does it correspond to the part of the rotationally invariant Hund's coupling which is called Spin-Flip term? If it's the first one, are there any plans that Spin-Flip/Pair-Hopping terms can be treated within the CT-HYB solver in the near future? best regards, Steffen

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