[ALPS-users] Fwd: Re: diagonal correlations

7 Feb 2017

      Hi,
Here is what I got, I met the same problem that you had; but I defined 
the observable as an operator in the considered hamiltonian and it seems 
to work ... You can check the results for different phases by playing 
with the hopping, the onsite interaction etc... and also if the number 
of states that you keep in the Schmidt decomposition is enough.
Julien
------------------------------
julien@Pegasus:~/Thesis/code_julien/dmrg/dmrg-01-dmrg$ 
./../../../../../julien/Thesis/ALPS/install/bin/alpspython test.py
mps_optim test_dens_corr.in.xml --write-xml
/bin/sh: 1: mps_optim: not found
[[x=[0 1 2 3 4 5 6 7 8 9]
y=[[ 1.31501684  1.35161251  1.31271542  1.3228399   1.31463584 1.31463585
    1.32283991  1.31271542  1.35161252  1.31501684]]
props={'nsweeps': 10.0, 'NUMBER_EIGENVALUES': 1.0, 'lattice_library': 
'alps', 'MAXSTATES': 100.0, 'L': 10.0, 'donotsave': 0.0, 'LATTICE': 
'open chain lattice', 'chkpfile': 
'/home/julien/Thesis/code_julien/dmrg/dmrg-01-dmrg/test_dens_corr.task1.out.chkp', 
'COMPLEX': 0.0, 'U': 0.0, 'CONSERVED_QUANTUMNUMBERS': 'N,Sz', 'V': 1.0, 
'MODEL': 'extended fermion Hubbard', 'seed': 42.0, 
'MEASURE_LOCAL[density_corr_diag]': 'n2', 'MODEL_LIBRARY': 
'mymodels.xml', 'observable': 'density_corr_diag', 'run_seconds': -1.0, 
'storagedir': 0.0, 'SWEEPS': 10.0, 'filename': 
'./test_dens_corr.task1.out.h5', 'hdf5_path': 
'/spectrum/results/density_corr_diag', 'SEED': 868763985.0, 
'model_library': 'alps', 'sweep_bond_dimensions': 
'20,28,37,46,55,64,73,82,91,100', 'N_total': 10.0, 'resultfile': 
'/home/julien/Thesis/code_julien/dmrg/dmrg-01-dmrg/test_dens_corr.task1.out.h5', 
't': 1.0}, x=[0]
y=[-15.06955933]
props={'nsweeps': 10.0, 'NUMBER_EIGENVALUES': 1.0, 'lattice_library': 
'alps', 'MAXSTATES': 100.0, 'L': 10.0, 'donotsave': 0.0, 'LATTICE': 
'open chain lattice', 'chkpfile': 
'/home/julien/Thesis/code_julien/dmrg/dmrg-01-dmrg/test_dens_corr.task1.out.chkp', 
'COMPLEX': 0.0, 'U': 0.0, 'CONSERVED_QUANTUMNUMBERS': 'N,Sz', 'V': 1.0, 
'MODEL': 'extended fermion Hubbard', 'seed': 42.0, 
'MEASURE_LOCAL[density_corr_diag]': 'n2', 'MODEL_LIBRARY': 
'mymodels.xml', 'observable': 'Energy', 'run_seconds': -1.0, 
'storagedir': 0.0, 'SWEEPS': 10.0, 'filename': 
'./test_dens_corr.task1.out.h5', 'hdf5_path': 
'/spectrum/results/Energy', 'SEED': 868763985.0, 'model_library': 
'alps', 'sweep_bond_dimensions': '20,28,37,46,55,64,73,82,91,100', 
'N_total': 10.0, 'resultfile': 
'/home/julien/Thesis/code_julien/dmrg/dmrg-01-dmrg/test_dens_corr.task1.out.h5', 
't': 1.0}]]
--------------------------------
On 07/02/2017 17:04, Robertson Esperanza wrote:
...
Yes, it is intended when I attached it, so it can be changed. When i 
run the script, I put the filepath, but I still get the x = [0], y = 
[0] result. Can I see what's the result when you run the script? Thank 
you for the help.
On Tue, Feb 7, 2017 at 6:53 PM, Julien 
<julien.despres@institutoptique.fr 
mailto:julien.despres@institutoptique.fr> wrote:
yes, there is no path ...

Julien

On 07/02/2017 09:53, Robertson Esperanza wrote:

...
the line where I put the file path of the xml file (i.e.
'MODEL_LIBRARY':) ?

On Tue, Feb 7, 2017 at 4:04 PM, Julien
<julien.despres@institutoptique.fr
<mailto:julien.despres@institutoptique.fr>> wrote:

    I tested your file after modifying this line. It works

    On 07/02/2017 09:01, Julien wrote:

...
    Hi,

    there is a little problem in your python script; have a look
    to the line where you include the xml file for the models.

    Julien

    -
    __________________________________

    DESPRES Julien
    Ph.D. student

    Center for Theoretical Physics
    Quantum Matter Theory team
    Ecole Polytechnique
    91128 Palaiseau Cedex
    France, EU
    Office : 00.10.06 (ground floor)
    Phone :+33 1 64 33 42 81 <tel:+33%201%2064%2033%2042%2081>

    Laboratoire Charles Fabry
    Atom Optics group
    Institut d'Optique Graduate School
    2 Avenue Augustin Fresnel
    91127 Palaiseau Cedex
    France, EU
    Office : R2.29 (1st floor)
    Phone:+33 1 64 53 33 49 <tel:+33%201%2064%2053%2033%2049>
    __________________________________
    On 07/02/2017 04:24, Robertson Esperanza wrote:

...
    I tried to print the result of taking the local measurement
    for n_i^2 but it only shows
    x = [0], y = [0], instead of x = [0 1 2 3 4 5 6 7 8 9], y =
    [10 scalar values] (since i'm using a 10-site open chain).
    I attached my python script and mymodels.xml. Thank you for
    the help.
    On Mon, Feb 6, 2017 at 4:29 PM, Julien
    <julien.despres@institutoptique.fr
    <mailto:julien.despres@institutoptique.fr>> wrote:

        Hi,

        you can do it in this way but in your parameter file
        you have to write :

        model['MODEL_LIBRARY'] = 'my_own_models.xml'

        or you can put it wherever you want but in this case :
        model['MODEL_LIBRARY'] = 'path_to_the_xml_file' Julien
        On 06/02/2017 09:21, Robertson Esperanza wrote:

...
        When creating a new model file, is it necessary that
        the new model file be saved on the same folder of the
        default models.xml file?
        On Mon, Feb 6, 2017 at 3:55 PM, Michele Dolfi
        <dolfim@phys.ethz.ch <mailto:dolfim@phys.ethz.ch>> wrote:

            MEASURE_AVERAGE is compute the average among all
            sites, i.e. a scalar value.
            MEASURE_LOCAL returns a list of measurements on
            all sites.
            Best,
            Michele
            --
            ETH Zurich
            Dr.Michele Dolfi
            Institute for Theoretical Physics
            HIT G 32.4
            Wolfgang-Pauli-Str. 27
            8093 Zurich
            Switzerland
            dolfim@phys.ethz.ch <mailto:dolfim@phys.ethz.ch>
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...
            On 6 Feb 2017, at 08:50, Robertson Esperanza
            <robbie.esperanza@gmail.com
            <mailto:robbie.esperanza@gmail.com>> wrote:
            Oh, I forgot to mention that I'm using mps_optim
            application. How does the result of
            MEASURE_AVERAGE differ from MEASURE_LOCAL, if
            let's say I use "n" for these parameters? Thanks
            On Mon, Feb 6, 2017 at 3:08 PM, Michele Dolfi
            <dolfim@phys.ethz.ch
            <mailto:dolfim@phys.ethz.ch>> wrote:

                Hello,
                Could you please be a bit more specific about
                the application you are running?
                You are right about the local measurement,
                but you need MEASURE_LOCAL, since you want to
                value at each site. Since the n_i^2 operator
                is not yet defined in the model library, you
                need to add it yourself. Basically I would do
                as follow:
                1. Copy the file models.xml from
                ALPS_ROOT/lib/xml/models.xml, where ALPS_ROOT
                is the root location of your alps installation.
                2. Add this definition to your local copy, it
                defines the n^2 operator
                <SITEOPERATOR name=“n_squared" site="x">
                  n(x)*n(x) </SITEOPERATOR>
                3. In your input parameters you have now to
                link to your new model file.
                MODEL_LIBRARY=“path/to/models.xml”
                4. And add your measurement
                MEASURE_LOCAL[Density^2] = “ n_squared"
                Hope this helps.
                Best,
                Michele
                --
                ETH Zurich
                Dr.Michele Dolfi
                Institute for Theoretical Physics
                HIT G 32.4
                Wolfgang-Pauli-Str. 27
                8093 Zurich
                Switzerland
                dolfim@phys.ethz.ch <mailto:dolfim@phys.ethz.ch>
                www.itp.phys.ethz.ch
                <http://www.itp.phys.ethz.ch>
                +41 44 633 78 56
                <tel:+41%2044%20633%2078%2056> phone
                +41 44 633 11 15
                <tel:+41%2044%20633%2011%2015> fax

>                     On 6 Feb 2017, at 07:26, Robertson Esperanza
>                     <robbie.esperanza@gmail.com
>                     mailto:robbie.esperanza@gmail.com> wrote:
>                     Hello, I only started studying many-body
>                     physics, so there might be gaps in my
>                     knowledge. When using the
>                     MEASURE_CORRELATION, why does the
>                     measurement goes for only site i<j, is it
>                     because there will be "blowing up"?
>                     Alternatively, to measure for i=j, i think I
>                     could use MEASURE_AVERAGE, of let's say
>                     (n_i)^2 where n - n_up + n_down. How could I
>                     define such measurement, where you use an
>                     operator successively? Thank you for replying
>                     Robertson Esperanza
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        __________________________________

        DESPRES Julien
        Ph.D. student

        Center for Theoretical Physics
        Quantum Matter Theory team
        Ecole Polytechnique
        91128 Palaiseau Cedex
        France, EU
        Office : 00.10.06 (ground floor)
        Phone :+33 1 64 33 42 81 <tel:+33%201%2064%2033%2042%2081>

        Laboratoire Charles Fabry
        Atom Optics group
        Institut d'Optique Graduate School
        2 Avenue Augustin Fresnel
        91127 Palaiseau Cedex
        France, EU
        Office : R2.29 (1st floor)
        Phone:+33 1 64 53 33 49 <tel:+33%201%2064%2053%2033%2049>
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    DESPRES Julien
    Ph.D. student

    Center for Theoretical Physics
    Quantum Matter Theory team
    Ecole Polytechnique
    91128 Palaiseau Cedex
    France, EU
    Office : 00.10.06 (ground floor)
    Phone :+33 1 64 33 42 81 <tel:+33%201%2064%2033%2042%2081>

    Laboratoire Charles Fabry
    Atom Optics group
    Institut d'Optique Graduate School
    2 Avenue Augustin Fresnel
    91127 Palaiseau Cedex
    France, EU
    Office : R2.29 (1st floor)
    Phone:+33 1 64 53 33 49 <tel:+33%201%2064%2053%2033%2049>
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DESPRES Julien
Ph.D. student

Center for Theoretical Physics
Quantum Matter Theory team
Ecole Polytechnique
91128 Palaiseau Cedex
France, EU
Office : 00.10.06 (ground floor)
Phone :+33 1 64 33 42 81 <tel:+33%201%2064%2033%2042%2081>

Laboratoire Charles Fabry
Atom Optics group
Institut d'Optique Graduate School
2 Avenue Augustin Fresnel
91127 Palaiseau Cedex
France, EU
Office : R2.29 (1st floor)
Phone: +33 1 64 53 33 49
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__________________________________

DESPRES Julien
Ph.D. student

Center for Theoretical Physics
Quantum Matter Theory team
Ecole Polytechnique
91128 Palaiseau Cedex
France, EU
Office : 00.10.06 (ground floor)
Phone : +33 1 64 33 42 81

Laboratoire Charles Fabry
Atom Optics group
Institut d'Optique Graduate School
2 Avenue Augustin Fresnel
91127 Palaiseau Cedex
France, EU
Office : R2.29 (1st floor)
Phone: +33 1 64 53 33 49
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[ALPS-users] Fwd: Re: diagonal correlations