[ALPS-users] diagonal correlations

Tue Feb 7 09:53:56 CET 2017

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 at 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 <+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
> __________________________________
>
>
> 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 at 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 at phys.ethz.ch>
>> dolfim at 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 at phys.ethz.ch
>>> www.itp.phys.ethz.ch
>>>
>>> +41 44 633 78 56 <+41%2044%20633%2078%2056> phone
>>> +41 44 633 11 15 <+41%2044%20633%2011%2015> fax
>>>
>>> On 6 Feb 2017, at 08:50, Robertson Esperanza <
>>> <robbie.esperanza at gmail.com>robbie.esperanza at 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 at phys.ethz.ch>
>>> dolfim at 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 at phys.ethz.ch>dolfim at phys.ethz.ch
>>>> <http://www.itp.phys.ethz.ch>www.itp.phys.ethz.ch
>>>>
>>>> +41 44 633 78 56 <+41%2044%20633%2078%2056> phone
>>>> +41 44 633 11 15 <+41%2044%20633%2011%2015> fax
>>>>
>>>> On 6 Feb 2017, at 07:26, Robertson Esperanza <
>>>> <robbie.esperanza at gmail.com>robbie.esperanza at 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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>>
>>
>>
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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 <+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 <+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 <+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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